CN115322374B - Liquid crystal elastomer film and preparation method and application thereof - Google Patents
Liquid crystal elastomer film and preparation method and application thereof Download PDFInfo
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- CN115322374B CN115322374B CN202210955115.0A CN202210955115A CN115322374B CN 115322374 B CN115322374 B CN 115322374B CN 202210955115 A CN202210955115 A CN 202210955115A CN 115322374 B CN115322374 B CN 115322374B
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- 239000004997 Liquid crystal elastomers (LCEs) Substances 0.000 title claims abstract description 157
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 238000005452 bending Methods 0.000 claims abstract description 166
- 230000004044 response Effects 0.000 claims abstract description 101
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 42
- 230000002708 enhancing effect Effects 0.000 claims description 25
- 239000002994 raw material Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 239000000178 monomer Substances 0.000 claims description 8
- 230000000737 periodic effect Effects 0.000 claims description 8
- 238000006116 polymerization reaction Methods 0.000 claims description 8
- 239000004970 Chain extender Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000006845 Michael addition reaction Methods 0.000 claims description 5
- 239000007809 chemical reaction catalyst Substances 0.000 claims description 5
- 239000003431 cross linking reagent Substances 0.000 claims description 5
- 238000004049 embossing Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 abstract description 24
- 230000002441 reversible effect Effects 0.000 abstract description 12
- 238000009826 distribution Methods 0.000 abstract description 6
- 230000000638 stimulation Effects 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 230000008602 contraction Effects 0.000 abstract 2
- 239000011259 mixed solution Substances 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 239000003960 organic solvent Substances 0.000 description 7
- 239000002904 solvent Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000010146 3D printing Methods 0.000 description 4
- -1 acrylic ester Chemical class 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000010345 tape casting Methods 0.000 description 4
- HCZMHWVFVZAHCR-UHFFFAOYSA-N 2-[2-(2-sulfanylethoxy)ethoxy]ethanethiol Chemical compound SCCOCCOCCS HCZMHWVFVZAHCR-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- UURSXESKOOOTOV-UHFFFAOYSA-N dec-5-ene Chemical compound CCCCC=CCCCC UURSXESKOOOTOV-UHFFFAOYSA-N 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 230000001678 irradiating effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000012299 nitrogen atmosphere Substances 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004298 light response Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- SRZXCOWFGPICGA-UHFFFAOYSA-N 1,6-Hexanedithiol Chemical compound SCCCCCCS SRZXCOWFGPICGA-UHFFFAOYSA-N 0.000 description 1
- KWVGIHKZDCUPEU-UHFFFAOYSA-N 2,2-dimethoxy-2-phenylacetophenone Chemical compound C=1C=CC=CC=1C(OC)(OC)C(=O)C1=CC=CC=C1 KWVGIHKZDCUPEU-UHFFFAOYSA-N 0.000 description 1
- 239000004971 Cross linker Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- JOBBTVPTPXRUBP-UHFFFAOYSA-N [3-(3-sulfanylpropanoyloxy)-2,2-bis(3-sulfanylpropanoyloxymethyl)propyl] 3-sulfanylpropanoate Chemical compound SCCC(=O)OCC(COC(=O)CCS)(COC(=O)CCS)COC(=O)CCS JOBBTVPTPXRUBP-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- DMLAVOWQYNRWNQ-UHFFFAOYSA-N azobenzene Chemical compound C1=CC=CC=C1N=NC1=CC=CC=C1 DMLAVOWQYNRWNQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- HQABUPZFAYXKJW-UHFFFAOYSA-N butan-1-amine Chemical compound CCCCN HQABUPZFAYXKJW-UHFFFAOYSA-N 0.000 description 1
- 238000004113 cell culture Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- WEHWNAOGRSTTBQ-UHFFFAOYSA-N dipropylamine Chemical compound CCCNCCC WEHWNAOGRSTTBQ-UHFFFAOYSA-N 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- UWHMFGKZAYHMDJ-UHFFFAOYSA-N propane-1,2,3-trithiol Chemical compound SCC(S)CS UWHMFGKZAYHMDJ-UHFFFAOYSA-N 0.000 description 1
- 239000013557 residual solvent Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G75/00—Macromolecular compounds obtained by reactions forming a linkage containing sulfur with or without nitrogen, oxygen, or carbon in the main chain of the macromolecule
- C08G75/02—Polythioethers
- C08G75/04—Polythioethers from mercapto compounds or metallic derivatives thereof
- C08G75/045—Polythioethers from mercapto compounds or metallic derivatives thereof from mercapto compounds and unsaturated compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/38—Polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/38—Polymers
- C09K19/3804—Polymers with mesogenic groups in the main chain
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2381/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen, or carbon only; Polysulfones; Derivatives of such polymers
- C08J2381/02—Polythioethers; Polythioether-ethers
Abstract
The invention discloses a liquid crystal elastomer film, a preparation method and application thereof. When the liquid crystal elastomer film is stimulated by heating, the film contracts along the orientation direction, the contraction deformation amount of one side surface with larger surface area is smaller than the contraction deformation amount of the other side surface with smaller surface area, and at least the thermal response bending deformation area section on the film bends towards the side of the surface with smaller surface area, so that the original appearance can be restored after the stimulation is removed. Therefore, through the distribution of the thermal response bending deformation area sections on the liquid crystal elastic film and the design of the upper surface area reinforcing structure, the thermal response reversible deformation customization of the liquid crystal elastic film can be realized, and the deformation is more flexible and rich.
Description
Technical Field
The invention relates to the technical field of liquid crystal elastomer materials, in particular to a liquid crystal elastomer film, a preparation method and application thereof.
Background
Liquid crystal elastomers have been widely used in the fields of soft robots, photonic devices, cell culture, tissue engineering, and the like, due to their inherent anisotropic properties and their programmable reversible deformation. Because of different driving modes, the method is mainly divided into light response, thermal response, electric response, magnetic response and the like, and the light response is caused by long-time work and damages to human bodies because azobenzene is driven by ultraviolet light; the electric response and the magnetic response are limited to the distance problem, and automatic control is difficult to realize. The liquid crystal elastomer with thermal response is characterized in that the internal molecular network is arranged in a single domain at normal temperature, when the temperature is increased, the liquid crystal molecular arrangement is changed from ordered to unordered, and macroscopically, the liquid crystal elastomer is contracted towards the single domain direction, and when the temperature is reduced, the liquid crystal molecular arrangement is changed from unordered to ordered and macroscopically, the liquid crystal molecular arrangement returns to the original form due to a certain restoring force given to the molecular chain, so that the driving mode is simple, the application environment is wide, and the liquid crystal elastomer is popular. However, the conventional liquid crystal elastomer has a single shrinkage deformation mode, so that the wide application of the liquid crystal elastomer material is limited.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a liquid crystal elastomer film, and a preparation method and application thereof.
In a first aspect of the present invention, a liquid crystal elastomer film is provided, where the liquid crystal elastomer film has a thermally responsive bending deformation region section, the thermally responsive bending deformation region section has a single domain orientation state, and at least one surface of the liquid crystal elastomer film located on the thermally responsive bending deformation region section has a surface area enhancement structure, so that the surface areas of the two side surfaces of the thermally responsive bending deformation region section are unequal.
Specifically, the surface area enhancement structure may be disposed on only one side surface of the liquid crystal elastomer film located on the thermally responsive bending deformation region section, and based on the disposition of the surface area enhancement structure, the surface areas of both side surfaces of the thermally responsive bending deformation region section on the liquid crystal elastomer film are not equal, and the surface area of the side surface on which the surface area enhancement structure is disposed is larger than the surface area of the side surface on which the surface area enhancement structure is not disposed. Alternatively, surface area enhancement structures of different specifications may be disposed on the two side surfaces of the liquid crystal elastomer film located on the thermally responsive bending deformation region section, and the surface areas of the two side surfaces are unequal based on the difference in the specifications (such as the depth of the surface area enhancement structure, the gap, etc.) of the surface area enhancement structures of the two side surfaces on the thermally responsive bending deformation region section, wherein the surface area of one side surface is larger than the surface area of the other side surface.
The liquid crystal elastomer film provided by the embodiment of the invention has at least the following beneficial effects: the liquid crystal elastomer film is provided with a single domain orientation thermal response bending deformation area section, and at least one side surface of the liquid crystal elastomer film, which is positioned on the thermal response bending deformation area section, is provided with a surface area enhancement structure, so that the surface areas of the two side surfaces of the thermal response bending deformation area section are unequal. By the arrangement of the surface area reinforcing structures on at least one side surface of the thermally responsive bending deformation region section, the surface areas of the two side surfaces of the thermally responsive bending deformation region section are not equal, when the liquid crystal elastomer film is subjected to thermal stimulus, the phase state of liquid crystal molecules in the thermally responsive bending deformation region section in microcosmic single domain orientation is changed, namely, the liquid crystal molecules are changed from nematic phase to homeotropic phase, the film macroscopically shows shrinkage along the orientation direction, and the shrinkage deformation amount of one side surface with larger surface area is smaller than the shrinkage deformation amount of the other side surface with relatively small surface area, so that at least the thermally responsive bending deformation region section on the liquid crystal elastomer film can bend towards the surface side with relatively small surface area, and after the stimulus is far away or removed, the reversible recovery of deformation can be realized. Therefore, through the distribution of the above thermal response bending deformation area sections and the arrangement of the upper surface area reinforcing structures on the liquid crystal elastomer film, the thermal response reversible deformation customization of the liquid crystal elastomer film, including the customization of the curling degree and the deformation shape, can be realized, and the shape change of the liquid crystal elastomer film is flexible and rich.
Wherein the thermally responsive bending deformation zone segments on the liquid crystal elastomer film can be designed to be one or more. In some embodiments of the invention, the thermally responsive bending deformation zone segment of the liquid crystal elastomeric film is one; the thermally responsive bending deformation zone section may occupy the entire film area of the liquid crystal elastomer film or may be designed to occupy only a portion of the film area of the liquid crystal elastomer film. The unitary liquid crystal elastomeric film may be designed to have a single domain orientation state, or only the thermally responsive bending deformation region segments thereon may be designed to have a single domain orientation state.
In some embodiments of the invention, the thermally responsive bending deformation zone segments are at least two. The arrangement of each of the thermally responsive bending deformation zone sections may be the same or different. For example, the same or different specifications of surface area enhanced stamped structures may be provided on the same side surface of the liquid crystal elastomeric film in the thermally responsive bending deformation zone section. Or, part of each thermal response bending deformation area section is provided with a surface area reinforcing structure on one surface, and part of each thermal response bending deformation area section is provided with surface area reinforcing structures with different specifications on two side surfaces, and the surface areas of the two side surfaces are unequal based on the arrangement of the surface area reinforcing structures; in addition, each thermal response bending deformation region section with the surface area enhancement structure on only one surface can be the same or different, and each thermal response bending deformation region section with the surface area enhancement structure with different specifications on both side surfaces can be the same or different. The distribution of the thermally responsive bending deformation zone segments on the liquid crystal elastomer film can be designed according to requirements.
In some embodiments of the present invention, the side surface having the larger surface area of the thermally responsive bending deformation zone section and the side surface having the larger surface area of the thermally responsive bending deformation zone section adjacent thereto are located on both sides or the same side of the liquid crystal elastomer film. That is, on two adjacent thermally responsive bending deformation region sections on the liquid crystal elastomer film, based on the arrangement of the surface area enhancement structure, the surface of the side with larger surface area can be arranged on two sides of the liquid crystal elastomer film or on the same side of the liquid crystal elastomer film.
For example, each thermally responsive bending deformation zone segment on a liquid crystal elastomer film can be designed to: the surface area enhancement structures are arranged on the surface of one side of each of the at least two adjacent thermal response bending deformation area sections, and the surfaces provided with the surface area enhancement structures are respectively arranged on two sides of the liquid crystal elastomer film or on the same side of the liquid crystal elastomer film. Alternatively, each thermally responsive bending deformation zone section may be designed to: the liquid crystal elastic film is provided with at least two adjacent thermal response bending deformation area sections, wherein one surface area reinforcing structure is arranged on one side surface only, surface area reinforcing structures with different specifications are arranged on the two side surfaces of the other thermal response bending deformation area section, and the surface with larger surface area and the surface with the surface area reinforcing embossing structures on the adjacent thermal response bending deformation area are positioned on the same side of the liquid crystal elastic film or are respectively arranged on the two sides of the liquid crystal elastic film based on the surface area reinforcing structures. Alternatively still, each thermally responsive bending deformation zone section may be designed to: the liquid crystal elastic membrane is provided with at least two adjacent thermal response bending deformation area sections, surface area enhancement structures with different specifications are arranged on the surfaces of the two sides, and based on the surface area enhancement structures, one side surface with larger surface area is positioned on the same side of the liquid crystal elastic membrane or is separately arranged on the two sides of the liquid crystal elastic membrane.
In some embodiments of the invention, adjacent ones of the thermally responsive bending deformation zone segments are disposed in abutment or in spaced apart relation. Specifically, adjacent thermal response bending deformation zone sections in each thermal response bending deformation zone section can be arranged in an abutting mode; alternatively, adjacent ones of the thermally responsive bending deformation zone sections may be spaced apart; or, the thermal response bending deformation region sections can be partially adjacent to each other in the thermal response bending deformation region sections and are arranged in a connected mode, and the partially adjacent thermal response bending deformation region sections are arranged at intervals.
In some embodiments of the invention, the difference in surface areas of the two side surfaces in the thermally responsive curved shape memory area section is equal to or different from the difference in surface areas of the two side surfaces in the thermally responsive curved shape memory area section adjacent thereto.
For example, in each thermal response bending deformation region section, the surface of the side with larger surface area in at least two adjacent thermal response bending deformation region sections is arranged on the same side of the liquid crystal elastomer film, the adjacent thermal response bending deformation region sections are connected, and the difference of the surface areas of the two side surfaces is unequal. For another example, each thermal response bending deformation region section is provided with at least two adjacent thermal response bending deformation region sections at intervals, one side surface with larger surface area is positioned on the same side of the liquid crystal elastomer film, and the difference of the surface areas of the two side surfaces is equal.
The surface area of the surface of the thermal response bending deformation area section is enhanced, so that the deformation customization of the thermal response bending deformation area section can be realized. The surface area enhancing structures generally exhibit a rugged surface topography compared to a flat surface to achieve an increase in surface area; the specific structural shape of the surface area enhancing structure may be set as desired, and may be a surface area enhancing structure that is visible or invisible to the naked eye.
In some embodiments of the invention, the surface area enhancing structure is a surface area enhancing microstructure; preferably, the surface area enhancing microstructure is a surface relief microstructure or a surface relief microstructure. Its surface area can be determined by a 3D topography meter. Specific dimensions of the surface area enhancing microstructures, including overall width dimension, height and spacing of the protrusions therein, etc., may be specifically tailored to the needs.
In some embodiments of the present invention, the surface area enhancing structure is a surface relief microstructure, the surface relief microstructure including a plurality of elongated protrusions arranged in a periodic array, and elongated grooves are formed between adjacent elongated protrusions; preferably, the elongated groove includes a main body groove section and a bottom buffer section, and the bottom buffer section is square along a section perpendicular to an extending direction of the elongated groove.
In some embodiments of the present invention, the liquid crystal elastomer film is prepared from raw materials including a liquid crystal monomer, a chain extender, a cross-linking agent, a michael addition reaction catalyst, and a photoinitiator; preferably, the preparation raw materials of the liquid crystal elastomer film comprise 77-81 wt% of liquid crystal monomer, 16-20 wt% of chain extender, 0.5-4.5 wt% of cross-linking agent, 1-3 wt% of Michael addition reaction catalyst and 1.5-2 wt% of photoinitiator.
Wherein, the liquid crystal monomer can be one or more of HCM-008, HCM-009, HCM-020 and HCM-021, or other acrylic ester liquid crystal monomers. The chain extender can be at least one of 2,2' - (1, 2-ethylenedioxy) diethyl mercaptan and 1, 6-hexanedithiol; the cross-linking agent can be at least one of pentaerythritol tetra (3-mercaptopropionic acid) ester and propane-1, 2, 3-trithiol; the Michael addition reaction catalyst can be at least one of triethylamine, dipropylamine, n-butylamine, 1, 5-triazidine bicyclo (4.4.0) dec-5-ene and other alkaline catalysts; the photoinitiator can be at least one of IRG819 and IRG 651.
In a second aspect of the present invention, a method for preparing any one of the liquid crystal elastomer films according to the first aspect of the present invention is provided, comprising the steps of:
s1, preparing a liquid crystal elastomer prepolymer film with a thermal response bending deformation area section; the thermal response bending deformation area section has a single domain orientation state, and at least one side surface of the thermal response bending deformation area section has a surface area enhancement structure, so that the surface areas of the two side surfaces are unequal;
s2, carrying out polymerization shaping treatment on the liquid crystal elastomer prepolymer film with the thermal response bending deformation area section.
The number and the positions of the thermal response bending deformation area sections and the surface area reinforcing structure of the surface of the thermal response bending deformation area sections can be designed and adjusted according to the requirements by the preparation method, so that the thermal response reversible deformation customization of the liquid crystal elastomer film is realized.
In some embodiments of the invention, step S1 comprises: preparing a single domain orientation liquid crystal elastomer prepolymer film, determining a thermal response bending deformation area section on the single domain orientation liquid crystal elastomer prepolymer film, and embossing a surface area enhancement structure on at least one side surface of the thermal response bending deformation area section so that the surface areas of the two side surfaces of the thermal response bending deformation area section are unequal.
Wherein, in the process of preparing the single domain orientation liquid crystal elastomer prepolymer film, the orientation of the film can be realized by at least one mode of stretching, knife coating and 3D printing. Specifically, a liquid crystal elastomer prepolymer base film may be prepared first, and then subjected to a single domain alignment treatment. For example, under yellow light, the preparation raw materials of the liquid crystal elastomer film and the organic solvent are uniformly mixed to prepare a mixed solution, then the mixed solution is poured into a mold, the liquid crystal elastomer prepolymer base film is obtained after the solvent is completely volatilized, and then the single domain orientation liquid crystal elastomer prepolymer film is prepared through stretching orientation. Wherein the organic solvent can be at least one of dichloromethane, toluene and tetrahydrofuran.
Alternatively, single domain orientation may be achieved during the film formation process. For example: the preparation raw materials of the liquid crystal elastomer film and the organic solvent can be uniformly mixed under the yellow light to prepare mixed liquid, then the prepared mixed liquid is coated on a substrate in a scraping way by a coating machine or printed on the substrate by a 3D printer, orientation is realized in the scraping way/3D printing process, and the single domain orientation liquid crystal elastomer prepolymer film is prepared after the solvent is completely volatilized.
After the single-domain oriented liquid crystal elastomer prepolymer film is prepared, a thermal response bending deformation area section can be determined on the single-domain oriented liquid crystal elastomer prepolymer film, then a template with a surface area enhancement structure on the surface is adopted, and the surface area enhancement structure on the surface of the template is transferred to at least one side surface of the thermal response bending deformation area section on the single-domain oriented liquid crystal elastomer prepolymer film in an imprinting mode. Alternatively, the surface area enhancing structures may be embossed directly on the surface of the thermally responsive bending deformation zone section.
In some embodiments of the invention, step S1 comprises: preparing a liquid crystal elastomer prepolymer film with thermally responsive bending deformation zone segments having a single domain orientation state by means of a mold having surface area enhancing structures on the surface thereof, wherein the thermally responsive bending deformation zone segments have corresponding surface area enhancing structures formed on at least one side surface thereof based on the surface area enhancing structures of the mold surface, and the surface areas of the two side surfaces of the thermally responsive bending deformation zone segments are made unequal.
The heat response bending deformation area section with the surface area enhancement structure on at least one side surface and the unequal surface areas on the two sides is formed while the liquid crystal elastomer prepolymer film is prepared by means of the mold with the surface area enhancement structure on the surface, and in actual production, the surface area enhancement structure on the surface of the mold can be designed according to the deformation requirement of the liquid crystal elastomer film product, including the setting position, the number, the specification and the like of the surface area enhancement structure, so that the deformation customization of the liquid crystal elastomer film is realized. The mould can be a film-making container with a cavity or a template. Specifically, if the surface area enhancement structures of each thermally responsive bending deformation region segment on the target liquid crystal elastomer film are located on the same side of the film, the corresponding surface area enhancement structures may be designed on only one surface of the mold (e.g., an inner surface of the film forming container or one surface of the template). If the surface area enhancement structures of each thermal response bending deformation region section on the target liquid crystal elastomer film are respectively arranged at two sides of the film, the corresponding surface area enhancement structures can be arranged at two opposite inner surfaces of the die (namely the film-making container); and corresponding surface area enhancing structures can be designed on the inner surface of the mold according to the target number, position and specification of the thermal response bending deformation area sections. In the case where the mold is a film forming container having a cavity, at least the side plate having the surface area enhancing structure on the inner surface thereof may be designed to be a detachable structure in order to facilitate peeling of the film. Or, in the case that the surface area enhancement structures of the thermal response bending deformation area sections on the target liquid crystal elastomer film are respectively arranged on two sides of the film, the preparation can also be carried out by means of at least two templates, wherein the at least two templates comprise a bottom plate and a cover plate, the bottom plate and the cover plate are respectively provided with the surface area enhancement structures corresponding to the surface area enhancement structures of the two sides of the thermal response bending deformation area sections on the liquid crystal elastomer film, the preparation can firstly coat the mixed liquid prepared by the preparation raw materials of the liquid crystal elastomer film on the bottom plate to form a coating, then cover the cover plate with the surface area enhancement structures on the coating, and the liquid crystal elastomer prepolymer base film with the preset bending deformation area section is prepared after the solvent in the coating is completely volatilized.
In addition, the orientation in the preparation process of the liquid crystal elastomer prepolymer film with the single domain orientation state thermal response bending deformation area section can be realized by at least one mode of stretching, knife coating and 3D printing.
For example, under yellow light, uniformly mixing preparation raw materials of the liquid crystal elastomer film and an organic solvent to prepare a mixed solution, pouring the mixed solution into a mold with a surface area reinforcing structure on the inner surface, and preparing the liquid crystal elastomer prepolymer base film with a preset bending deformation area section after the solvent is completely volatilized, wherein the surface area reinforcing structure on the inner surface of the mold is based on the surface area reinforcing structure of the inner surface of the mold, at least one side surface of the preset bending deformation area section forms a corresponding surface area reinforcing structure, the surface areas on two side surfaces of the bending deformation area section are unequal, and stretching at least the preset bending deformation area section on the liquid crystal elastomer prepolymer base film to enable the preset bending deformation area section to be a thermal response bending deformation area section with a single domain orientation state; wherein, only the predetermined bending deformation region section on the liquid crystal elastomer prepolymer base film can be stretched to enable the predetermined bending deformation region section to have a single domain orientation state so as to form a thermal response; the liquid crystal elastomer prepolymer base film may also be integrally stretched to give the integral liquid crystal elastomer prepolymer film a single domain orientation to develop a thermal response.
Alternatively, as described above, a liquid crystal elastomer prepolymer base film having predetermined bending deformation zone segments may be prepared by means of a base plate and a cover plate having surface area enhancing structures, and then stretching at least the predetermined bending deformation zone segments on the liquid crystal elastomer prepolymer base film to render the predetermined bending deformation zone segments into thermally responsive bending deformation zone segments having a single domain orientation state.
Alternatively, single domain orientation may be achieved while the film is being formed. For example: the preparation raw materials of the liquid crystal elastomer film and the organic solvent can be uniformly mixed under the yellow light to prepare mixed liquid, then the prepared mixed liquid is coated on a die with a surface area enhanced structure through a coater or printed on a 3D printer, orientation is realized in the process of coating/3D printing, and the liquid crystal elastomer prepolymer film with a single domain orientation state thermal response bending deformation area section is prepared after the solvent is completely volatilized.
In some embodiments of the present invention, in step S2, the polymerization shaping treatment is an ultraviolet irradiation treatment; the ultraviolet irradiation treatment is generally performed in an inert gas (such as nitrogen, argon, etc.) atmosphere to prevent the photoinitiator from reacting with oxygen; the ultraviolet irradiation intensity can be 90-100 mW/cm 2 The irradiation time can be controlled between 40 and 50 minutes. The mold adopted in the step S1 is a light-transmitting mold correspondingly.
In a third aspect of the present invention, the application of the liquid crystal elastomer film according to the first aspect of the present invention or the liquid crystal elastomer film according to any one of the preparation methods of the liquid crystal elastomer films according to the second aspect of the present invention in a soft actuator is provided. The thermal response deformation shape of the liquid crystal elastomer film can be controlled through the distribution design of the thermal response bending deformation region section on the liquid crystal elastomer film and the arrangement of the surface area reinforcing structure specification, so that the push-pull movement of an object can be realized.
Drawings
The invention is further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural diagram of a liquid crystal elastomer film prepared in example 1;
FIG. 2 is a 3D representation of the liquid crystal elastomeric film made in example 1;
FIG. 3 is a schematic view showing the heat shrinkage principle of the liquid crystal elastomer film prepared in example 1;
FIG. 4 is a schematic diagram showing the thermal response and reversible deformation of the liquid crystal elastomer film prepared in example 1;
FIG. 5 is a schematic structural view of an embodiment of a thermally responsive bending deformation region segment of a liquid crystal elastomer film according to the present invention;
FIG. 6 is a schematic diagram showing the thermal response reversible deformation of the liquid crystal elastomer film prepared in example 2;
FIG. 7 is a schematic diagram showing the thermal response reversible deformation of the liquid crystal elastomer film prepared in comparative example 1.
Detailed Description
The conception and the technical effects produced by the present invention will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention.
Example 1
The embodiment prepares a liquid crystal elastomer film, and the specific preparation method comprises the following steps:
s1, taking preparation raw materials according to the following dosage proportion: 77wt% of liquid crystal monomer HCM-008, 1.6wt% of photoinitiator Irg819, 1.3wt% of cross-linking agent pentaerythritol tetra (3-mercaptopropionic acid) ester, 19wt% of chain extender (2, 2' - (1, 2-ethylenedioxy) diethyl mercaptan and 1.1wt% of catalyst 1, 5-triazido bicyclo (4.4.0) dec-5-ene;
wherein, the liquid crystal monomer HCM-008 is purchased from Jiangsu and new material forming Co., ltd, and has the structural formula:
the photoinitiator Irg819 is purchased from Tianjin Seen Biochemical Co., ltd and has the structural formula:
pentaerythritol tetrakis (3-mercaptopropionate), a crosslinker, was purchased from Aba Ding Gongsi and has the structural formula:
the chain extender 2,2' - (1, 2-ethanediyl dioxy) bis-ethanethiol was purchased from merck, germany, and has the structural formula:
the structural formula of the Michael addition reaction catalyst 1, 5-triazidine bicyclo (4.4.0) dec-5-ene is as follows:
s2, pouring the mixed solution obtained in the step S1 into a PTFE (polytetrafluoroethylene) mould, obtaining a loosely crosslinked liquid crystal elastomer prepolymer base film after the organic solvent is completely volatilized, and then stretching and orienting to obtain a single domain oriented liquid crystal elastomer prepolymer film;
s3, taking a light-transmitting template with a surface relief microstructure corresponding to the surface relief microstructure of the surface of the liquid crystal elastomer film shown in FIG. 1, then directing one side of the light-transmitting template with the surface relief microstructure to the single domain orientation liquid crystal elastomer prepolymer film prepared in the step S2, transferring the surface relief microstructure on the light-transmitting template to the surface of the single domain orientation liquid crystal elastomer prepolymer film in an imprinting mode, and fixing the template and the film;
s4, irradiating ultraviolet light on the sample obtained in the step S3 in a nitrogen atmosphere to induce secondary polymerization of the single domain oriented liquid crystal elastomer prepolymer film, and fixing the liquid crystal molecular orientation and surface relief microstructure, wherein the intensity of the adopted ultraviolet light is 100mW/cm 2 The irradiation time is 40min; and after the irradiation is finished, the film is separated from the template, and the liquid crystal elastomer film with the surface having the embossed three-dimensional microstructure is prepared.
As shown in fig. 1 and 2, the above-produced liquid crystal elastomer film has a thermally responsive bending deformation region section 10, the thermally responsive bending deformation region section 10 having a single domain orientation state, and one side surface of the thermally responsive bending deformation region section 10 having a surface area reinforcing structure 11, the surface area of the surface provided with the surface area reinforcing structure 11 being larger than the surface area of the surface not provided with the surface area reinforcing structure 11 based on the arrangement of the surface area reinforcing structure 11 on the one side surface of the thermally responsive bending deformation region section 10 such that the surface areas of the both side surfaces of the thermally responsive bending deformation region section 10 are not equal. In this embodiment, the number of the thermally responsive bending deformation zone sections 10 on the liquid crystal elastomer film is one, and the thermally responsive bending deformation zone sections 10 occupy the entire film area of the liquid crystal elastomer film; the surface area enhancing structure 11 is specifically a surface relief microstructure, wherein the surface relief microstructure 11 includes a plurality of elongated protrusions 111 arranged in a periodic array, and elongated grooves 112 are formed between adjacent elongated protrusions 111; in the present embodiment, the first elongated protrusion 111 and the first elongated groove 112 have triangular cross sections perpendicular to the extending direction of the first elongated protrusion 111.
The liquid crystal elastomer film is subjected to thermal stimulation, the phase state of liquid crystal molecules in a thermally-responsive bending deformation area section with microscopic single domain orientation is changed from nematic phase to homeotropic phase (shown in figure 3), the film macroscopically shows shrinkage along the orientation direction, and based on the arrangement of the surface area enhancement structure, the shrinkage deformation amount of one side surface with larger surface area is smaller than that of the side surface without the surface area enhancement structure, the liquid crystal elastomer film is bent towards the side surface without the surface area enhancement structure, and after the stimulation is removed or removed, the liquid crystal elastomer film can realize reversible recovery of deformation (shown in figure 4).
In other embodiments, the surface area enhancing stamped structures may be designed in other shapes. For example, in some embodiments, the surface area enhancement structure on the thermally responsive bending deformation region of the liquid crystal elastomer film shown in fig. 1 may be adjusted to be the surface area enhancement structure shown in fig. 5, where the surface area enhancement structure is also a surface relief microstructure, and the surface relief microstructure includes a plurality of elongated protrusions second 21 arranged in a periodic array, a second elongated groove 22 is formed between adjacent elongated protrusions second 21, and the second elongated groove 22 includes a main groove section 221 and a bottom buffer section 222, and the bottom buffer section 222 is square along a section perpendicular to the extending direction of the second elongated groove 22; through this design, when receiving thermal stimulation film deformation, the bottom groove section of square cross-section can produce certain deformation buffering, slows down or avoids under the big deformation stress, and the surface of thermal response bending deformation region section takes place to split in rectangular shape recess two 22 bottom positions department on the microstructure, improves the life-span of liquid crystal elastomer film. In addition, the main body groove section 221 of the second elongated groove 22 is located at the upper portion of the bottom buffer section 222, and the cross section of the main body groove section 221 along the direction perpendicular to the extending direction of the second elongated groove 22 may be designed to be in a frustum shape.
The surface area enhancement structure of the surface of the template is transferred to the thermal response bending deformation area section in an imprinting mode by means of the light-transmitting template with the surface area enhancement structure, the shape of the surface area enhancement structure on the light-transmitting template corresponds to the surface relief microstructure of the thermal response bending deformation area section, and further it can be understood that the surface relief microstructure of the adopted light-transmitting template correspondingly comprises a plurality of strip-shaped protruding portions three which are arrayed in a periodic mode, a strip-shaped groove three is formed between every two adjacent strip-shaped protruding portions three, each strip-shaped protruding portion three comprises a main body protruding section and a top buffer section, the main body protruding section is in a frustum shape along the section perpendicular to the extending direction of the strip-shaped protruding portion three, and the top buffer section is square along the section perpendicular to the extending direction of the strip-shaped protruding portion three. By the arrangement, the design of the main body convex section of the three-upper frustum-shaped section of the strip-shaped convex part can facilitate the embossing forming of the surface relief microstructure of the liquid crystal elastomer film, and reduce the pressure application; the design of the top buffer section with the square section is characterized in that the bottom buffer groove section with the square section is correspondingly formed on the liquid crystal elastomer film on the one hand, so that the service life of the liquid crystal elastomer film can be prolonged, and on the other hand, compared with the top with the conical section, the liquid crystal elastomer film is less prone to breaking and damage during use, and the service life of the template can be prolonged.
In example 1, the liquid crystal elastomer film has a thermally responsive bending deformation zone section thereon; in other embodiments, the liquid crystal elastomer film has a plurality of thermally responsive bending deformation zone segments thereon.
Example 2
The embodiment prepares a liquid crystal elastomer film, and the specific preparation method comprises the following steps:
s1, preparing a mixed solution according to the same operation as in the example 1;
and S2, heating the automatic coating machine to 50 ℃, pushing the coating machine at a motion speed of 1500r/S, taking the glass with the surface coated with polyvinyl alcohol as a substrate, doctor-blading the mixed solution prepared in the step S1 on the glass substrate in a doctor-blading mode to form a film, naturally cooling to room temperature after the film is formed, continuously volatilizing the residual solvent under a yellow light condition, and obtaining the single domain orientation liquid crystal elastomer prepolymer film after the solvent is volatilized.
S3, presetting a first preset thermal response bending deformation area section and a second preset thermal response bending deformation area section on the single domain orientation liquid crystal elastomer prepolymer film prepared in the step S2, wherein the first preset thermal response bending deformation area section and the second preset thermal response bending deformation area section are connected; taking two light-transmitting templates identical to those in the embodiment 1, imprinting one light-transmitting template on the surface of a first preset thermal response bending deformation area section in the same manner as in the step S3 in the embodiment 1, imprinting the other light-transmitting template on the surface of a second preset thermal response bending deformation area section, and respectively arranging the light-transmitting templates imprinted on the first preset thermal response bending deformation area section and the second preset thermal response bending deformation area section on two sides of a single domain orientation liquid crystal elastomer prepolymer film to fix the templates and the film;
s4, irradiating ultraviolet light on the sample obtained in the step S3 in a nitrogen atmosphere to induce secondary polymerization of the single domain oriented liquid crystal elastomer prepolymer film, and fixing the liquid crystal molecular orientation and surface relief microstructure, wherein the intensity of the adopted ultraviolet light is 100mW/cm 2 The irradiation time is 20min; after the irradiation is completed, the glass and the template are removed in warm water, and the liquid crystal elastomer film with the surface having the embossed three-dimensional microstructure is prepared.
The liquid crystal elastomer film prepared by the method is provided with two connected thermal response bending deformation area sections, each thermal response bending deformation area section is in a single domain orientation state, and the surface area of one side of the thermal response bending deformation area section on the liquid crystal elastomer film is provided with a surface area enhancement structure, so that the surface areas of two sides of the thermal response bending deformation area section are unequal, and specifically, the surface area of one side surface provided with the surface area enhancement structure is larger than the surface area of the other side surface not provided with the surface area enhancement structure. In this embodiment, the surfaces with surface area enhancement structures on the two connected thermally responsive bending deformation regions are respectively arranged on two sides of the liquid crystal elastomer film, and the specific shape of the surface area enhancement embossing structure is the same as that of embodiment 1.
The two thermal response bending deformation area sections connected to each other on the liquid crystal elastomer film according to the embodiment are based on the arrangement of the surface area enhancement structure on the two thermal response bending deformation area sections, the surface area of the surface of one side with the surface area enhancement structure is larger than the surface area of the surface without the surface area enhancement structure, when the two thermal response bending deformation area sections are subjected to thermal stimulation, the shrinkage deformation amount of the surface of one side with the larger surface area is smaller than the shrinkage deformation amount of the surface of the other side with the relatively smaller surface area, and the two thermal response bending deformation area sections are respectively bent towards the surface side without the surface area enhancement structure, as shown in fig. 6.
Example 3
The embodiment prepares a liquid crystal elastomer film, and the specific preparation method comprises the following steps:
s1, preparing a mixed solution by the same operation as the step S1 in the embodiment 1;
s2, pouring the mixed solution prepared in the step S1 into a containing cavity of a PTFE mold with the bottom inner surface having a surface relief microstructure corresponding to the surface relief microstructure of the surface of the liquid crystal elastomer film shown in FIG. 1, obtaining a liquid crystal elastomer prepolymer base film which is loosely crosslinked and has the surface relief microstructure after the organic solvent is completely volatilized, and then stretching and orienting to obtain the liquid crystal elastomer prepolymer film which has a single domain orientation state and has the surface relief microstructure on one side;
s3, irradiating ultraviolet light on the liquid crystal elastomer prepolymer film treated in the step S2 in a nitrogen atmosphere,to induce the secondary polymerization of the liquid crystal elastomer prepolymer film, fix the liquid crystal molecular orientation and the surface relief microstructure, and the intensity of the adopted ultraviolet light is 100mW/cm 2 The irradiation time is 40min, and the liquid crystal elastomer film with the surface having the surface relief microstructure is prepared.
Comparative example 1
This comparative example a liquid crystal elastomer film was prepared, and this comparative example differs from example 1 in that: step S3 in embodiment 1 is eliminated, and the other operations are the same as in embodiment 1.
The liquid crystal elastomer film prepared in this comparative example had a single domain orientation but had no surface area enhanced embossed structure on its surface, and the liquid crystal elastomer film without surface area enhanced embossed structure on its surface was shrunk by heat but did not bend, and returned to its original shape when the heat source was removed, as shown in fig. 7.
From the above, by designing the thermally responsive bending deformation region segment with a single domain orientation state on the liquid crystal elastomer film, at least one side surface of the thermally responsive bending deformation region segment has a surface area enhancing structure, and the surface areas of the two side surfaces of the thermally responsive bending deformation region segment are not equal based on the arrangement of the surface area enhancing structure. By the arrangement of the surface area reinforcing structures on at least one side surface of the thermally responsive bending deformation region section, the surface areas of the two side surfaces of the thermally responsive bending deformation region section are not equal, when the liquid crystal elastomer film is subjected to thermal stimulus, the phase state of liquid crystal molecules in the thermally responsive bending deformation region section in microcosmic single domain orientation is changed, namely, the liquid crystal molecules are changed from nematic phase to homeotropic phase, the film macroscopically shows shrinkage along the orientation direction, and the shrinkage deformation amount of one side surface with larger surface area is smaller than the shrinkage deformation amount of the other side surface with relatively small surface area, so that at least the thermally responsive bending deformation region section on the liquid crystal elastomer film can bend towards the surface side with relatively small surface area, and after the stimulus is far away or removed, the reversible recovery of deformation can be realized. Therefore, the deformation of the liquid crystal elastic film can be controlled by adjusting and controlling the number and the distribution of the thermal response bending deformation area sections and the arrangement of the upper surface area reinforcing structures of the liquid crystal elastic film, so that the thermal response reversible deformation customization of the liquid crystal elastic film is realized, the curling degree and the deformation shape customization are included, and the shape change of the liquid crystal elastic film is flexible and rich.
In addition to the above embodiments, the thermally responsive bending deformation region on the liquid crystal elastomer film may be configured in a plurality of ways, such as 3, 5, 8, etc. The thermally responsive bending deformation zone section may be designed to occupy only a portion of the film area of the liquid crystal elastomeric film, in addition to the entire film area of the liquid crystal elastomeric film, similar to the above embodiments. For a liquid crystal elastomer film comprising a plurality of thermally responsive bending deformation zone segments, the arrangement of the thermally responsive bending deformation zone segments thereon may be the same or different. For example, adjacent thermally responsive bending deformation region segments arranged in a connected arrangement and having a side surface with a larger surface area separated on both sides of the liquid crystal elastomer film may also be designed differently based on the arrangement of the surface area enhancing structures; based on the arrangement of the surface area enhancement structure, adjacent thermal response bending deformation area sections with larger surface area and one side surface being respectively arranged at two sides of the liquid crystal elastomer film can be arranged at intervals, and the adjacent thermal response bending deformation area sections can be the same or different; based on the surface area enhancement structure, adjacent thermal response bending deformation region sections with larger surface area and arranged on the same side of the liquid crystal elastomer film can be arranged at intervals, and the adjacent thermal response bending deformation region sections can be the same or different; alternatively, based on the arrangement of the surface area enhancement structure, adjacent thermally responsive bending deformation region sections with one side surface with larger surface area arranged on the same side of the liquid crystal elastomer film can be connected and arranged, and the difference of the surface areas of the two side surfaces is unequal. The number and the distribution of the thermal response bending deformation area sections on the liquid crystal elastic film and the surface area reinforcing structures on the thermal response bending deformation area sections can be specifically set according to requirements, and the reversible deformation customization can be realized through the control of the thermal response bending deformation area sections and the surface area reinforcing structures.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (8)
1. The liquid crystal elastomer film is characterized in that a thermal response bending deformation area section is arranged on the liquid crystal elastomer film, the thermal response bending deformation area section is in a single domain orientation state, and at least one side surface of the thermal response bending deformation area section on the liquid crystal elastomer film is provided with a surface area enhancement structure, so that the surface areas of the two side surfaces of the thermal response bending deformation area section are unequal; the surface area enhancement structure is a surface relief periodic microstructure, and the surface relief periodic microstructure comprises a plurality of strip-shaped protruding parts which are arranged in a periodic array, and strip-shaped grooves are formed between adjacent strip-shaped protruding parts; the surface area enhancing structure is a surface area enhancing embossed structure;
the preparation raw materials of the liquid crystal elastomer film comprise 77-81wt% of liquid crystal monomer, 16-20wt% of chain extender, 0.5-4.5wt% of cross-linking agent, 1-3wt% of Michael addition reaction catalyst and 1.5-2wt% of photoinitiator; wherein the liquid crystal monomer is HCM-008;
the preparation method of the liquid crystal elastomer film comprises the following steps:
s1, preparing a liquid crystal elastomer prepolymer film with a thermal response bending deformation area section; the thermal response bending deformation area section has a single domain orientation state, and at least one side surface of the thermal response bending deformation area section has a surface area enhancement structure, so that the surface areas of the two side surfaces are unequal;
s2, carrying out polymerization shaping treatment on the liquid crystal elastomer prepolymer film with the thermal response bending deformation area section;
in the step S2, the polymerization and shaping treatment process is as follows: adopting 90-100 mW/cm 2 The ultraviolet light irradiation of the liquid crystal elastic body is carried out for 40 to 50 minutes so as to induce the secondary polymerization of the single domain orientation liquid crystal elastic body prepolymer film and fix the liquid crystal molecular orientation and the periodic microstructure of the surface relief.
2. The liquid crystal elastomer film of claim 1 wherein there are at least two thermally responsive bending deformation zone segments.
3. The liquid crystal elastomer film of claim 2, wherein the side surface of the thermally responsive bending deformation zone section having the greater surface area and the side surface of the thermally responsive bending deformation zone section adjacent thereto having the greater surface area are on either or both sides of the liquid crystal elastomer film.
4. A liquid crystal elastomeric film according to claim 2, wherein adjacent said thermally responsive bending deformation zone segments are disposed in abutting or spaced relationship.
5. The liquid crystal elastomer film of claim 2, wherein the difference in surface areas of the two side surfaces in the thermally responsive bending deformation zone section is equal to or different from the difference in surface areas of the two side surfaces in the thermally responsive bending deformation zone section adjacent thereto.
6. The liquid crystal elastomer film as claimed in claim 1, wherein the elongated groove comprises a main body groove section and a bottom buffer section, and the bottom buffer section is square or triangular in cross section along a direction perpendicular to an extending direction of the elongated groove.
7. The liquid crystal elastomer film as claimed in claim 1, wherein step S1 comprises: preparing a single domain orientation liquid crystal elastomer prepolymer film, determining a thermal response bending deformation area section on the single domain orientation liquid crystal elastomer prepolymer film, and embossing a surface area enhancement structure on at least one side surface of the thermal response bending deformation area section so that the surface areas of the two side surfaces of the thermal response bending deformation area section are unequal;
alternatively, step S1 includes: preparing a liquid crystal elastomer prepolymer base film with a thermally responsive bending deformation region section by means of a mold with a surface area enhancing structure on the surface, wherein the thermally responsive bending deformation region section has a single domain orientation state, and the corresponding surface area enhancing structure is formed on at least one side surface of the thermally responsive bending deformation region section based on the surface area enhancing structure of the mold surface, and the surface areas of the two side surfaces of the thermally responsive bending deformation region section are unequal.
8. Use of a liquid crystalline elastomeric film according to any one of claims 1 to 7 in a soft actuator.
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