CN114164008A - Stretchable blue-phase liquid crystal elastomer and preparation method thereof - Google Patents
Stretchable blue-phase liquid crystal elastomer and preparation method thereof Download PDFInfo
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- 239000004997 Liquid crystal elastomers (LCEs) Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 80
- 239000000178 monomer Substances 0.000 claims abstract description 71
- 238000004132 cross linking Methods 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 25
- 238000012650 click reaction Methods 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 150000003384 small molecules Chemical class 0.000 claims abstract description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 24
- 239000003054 catalyst Substances 0.000 claims description 22
- 229920001971 elastomer Polymers 0.000 claims description 22
- 239000000806 elastomer Substances 0.000 claims description 22
- 239000002243 precursor Substances 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 18
- 150000003573 thiols Chemical class 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 8
- 101000795744 Homo sapiens TPA-induced transmembrane protein Proteins 0.000 claims description 6
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- 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 claims description 6
- 239000003999 initiator Substances 0.000 claims description 6
- 239000004988 Nematic liquid crystal Substances 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 210000002858 crystal cell Anatomy 0.000 claims description 2
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 230000002441 reversible effect Effects 0.000 abstract description 7
- 230000008859 change Effects 0.000 abstract description 4
- 230000005737 synergistic response Effects 0.000 abstract description 3
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- 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
- C09K19/42—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
- C09K19/44—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing compounds with benzene rings directly linked
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
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- C08F220/30—Esters containing oxygen in addition to the carboxy oxygen containing aromatic rings in the alcohol moiety
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Abstract
The invention provides a stretchable blue-phase liquid crystal elastomer and a preparation method thereof, wherein the raw materials for preparing the stretchable blue-phase liquid crystal elastomer comprise: achiral small molecule liquid crystal, a photopolymerizable monomer, a chiral material, a photoinitiator, and a click reaction crosslinking monomer. In the preparation method, the liquid crystal molecules can be induced to self-assemble to construct a blue phase liquid crystal structure in a click chemical reaction process. The blue phase liquid crystal elastomer has synergistic response of deformation and color change, has good mechanical ductility, and the mechanical reversible reflection color of the blue phase liquid crystal elastomer can be flexibly adjusted in almost the whole visible light wave band and can be stretched to 2 times or more of the original length.
Description
Technical Field
The invention relates to the field of liquid crystal three-dimensional photonic crystals and elastomers, in particular to a stretchable blue-phase liquid crystal elastomer and a preparation method thereof.
Background
In the blue phase liquid crystal, a double-helix cylindrical structure formed by liquid crystal molecules under the action of a high chiral agent spontaneously forms a three-dimensional lattice system structure in a spatial topological form under the interaction between the molecules, but the defects exist between the cylinder and the column. The blue phase liquid crystal constitutes an unstable region having a high free energy in the system due to the presence of a defect structure. Thermal stability has been a technical challenge for the blue phase until the introduction of a polymer network to stabilize defect structures by in situ photopolymerization of mono-and diacrylate reactive mesogens, and is called polymer stabilized blue phase liquid crystals. The polymer stabilized blue phase liquid crystal not only has good thermal stability and photon energy band structure, but also shows fast switchable and stable electro-optical characteristics. However, they cannot withstand any mechanical deformation, limiting their use in elastomers.
For the manufacture of stretchable blue phase liquid crystalline elastomers, the preferred strategy is an in situ photopolymerization process. For example, the document Zhang Y S, Jiang S A, Lin J D, et al, Advanced Optical Materials, 2021 stretchable blue phase liquid crystalline elastomer films are achieved by achieving fully reacted chain polymers using a 100% reactive polymerizable mesogenic system. The document Schlafmann K R, White T J., Nature Communication:2021 proposes an extensible process for the preparation of blue phase liquid crystalline elastomers by one-step free radical photopolymerization and washing with acetone to remove other unreacted components. Furthermore, supramolecular bonds in the network and low molecular weight organogels are used to achieve field induced photonic band gap changes in the blue phase with little mechanical deformation. However, limited mechanical stretchability (Δ λ <140nm, less than 1.5 times the original length) is an urgent technical challenge for blue phase liquid crystalline elastomers. Therefore, there is a need for a robust method to make free standing blue phase liquid crystalline elastomers with high elasticity, deformation, discoloration and synergistic response.
Disclosure of Invention
The embodiment of the invention provides a stretchable blue phase liquid crystal elastomer and a preparation method thereof, which aim to solve the problems in the prior art.
The embodiment of the invention provides a stretchable blue-phase liquid crystal elastomer, which is prepared from the following raw materials: achiral small molecule liquid crystal, a photopolymerizable monomer, a chiral material, a photoinitiator, and a click reaction crosslinking monomer.
Preferably, the elastomer is stretchable to more than 2 times its original length;
preferably, the achiral small-molecule liquid crystal, the photopolymerizable monomer, the chiral material, the photoinitiator and the click reaction crosslinking monomer respectively comprise, by mass: 46-48 wt%, 38.1 wt%, 2-4 wt%, 0.3 wt%, 11.4 wt%;
preferably, the raw materials further comprise: and 0.15wt% of catalyst.
Preferably, the photopolymerizable monomers include acrylate and/or siloxane based photopolymerizable monomers; the click reaction crosslinking monomer comprises thiol click reaction crosslinking monomer;
preferably, the chiral material is one or more of S5011, R1011, S1011, R811, S811, CB15 or LC 756;
preferably, the initiator is an ultraviolet photoinitiator IRG 184;
preferably, the catalyst is DPA.
Preferably, the acrylate photopolymerizable monomer is selected from one or more of RM105, C3M, or C6M.
Preferably, the thiol click-reaction crosslinking monomer is one or more of EDDET, PETMP and TTMP.
Preferably, the raw materials for preparing the stretchable blue phase liquid crystal elastomer include: acrylate photopolymerizable monomers RM105 and C3M, a photoinitiator IRG184, a thiol photopolymerizable monomer EDDET, a catalyst DPA, a chiral material R5011 and achiral small molecule liquid crystal.
The invention also provides a preparation method of the stretchable blue phase liquid crystal elastomer, which comprises the following steps:
1) mixing and heating achiral small molecular liquid crystal, a photopolymerizable monomer, a chiral material and a photoinitiator to isotropy, and uniformly stirring; cooling to room temperature, adding a catalyst diluted by achiral small molecular liquid crystal, and uniformly stirring; adding a click reaction crosslinking monomer, and uniformly stirring to obtain a liquid crystal precursor;
2) heating the liquid crystal precursor to a liquid crystal clearing point, and filling the liquid crystal precursor into a container or coating the liquid crystal precursor on a substrate;
3) cooling the temperature of the container/substrate to enable the liquid crystal precursor to reach a blue phase state, and controlling the cooling speed to be within 0.01-10 ℃/min;
4) and irradiating the blue phase state for 10 s-30 min under light, and taking out the blue phase state from the container or the substrate to obtain the stretchable blue phase liquid crystal elastomer.
Preferably, the container comprises a liquid crystal cell, and the substrate comprises glass, plastic, walls, or the like;
preferably, the thickness of the liquid crystal box is 8-60 μm;
preferably, the light includes ultraviolet light, visible light, and infrared light;
preferably, the irradiation intensity of the light is 2mW/cm2 or more.
Preferably, the elastomer is stretched to more than 2 times its original length;
preferably, the photopolymerizable monomer comprises an acrylate-based photopolymerizable monomer;
preferably, the click-reactive cross-linking monomer comprises a thiol type click-reactive cross-linking monomer;
preferably, the chiral material is one or more of S5011, R1011, S1011, R811, S811, CB15 or mesol 756; the initiator is an ultraviolet initiator IRG 184;
preferably, the catalyst is DPA;
preferably, the acrylate photopolymerizable monomer is selected from one or more of RM105, C3M, or C6M;
preferably, the thiol click-reaction crosslinking monomer is one or more of EDDET, PETMP and TTMP.
The invention also provides a stretchable blue phase liquid crystal elastomer, which is prepared by any one of the methods.
The invention has the beneficial effects that:
the blue phase liquid crystal provided by the embodiment of the invention is uniformly colored and has high reflectivity because the blue phase is influenced by the reaction of the click crosslinking monomer and the acrylate polymerizable monomer under the action of the catalyst.
The click chemical reaction process can induce the liquid crystal molecules to self-assemble to construct a blue phase liquid crystal structure. The blue phase liquid crystal elastomer has synergistic response of deformation and color change, has good mechanical ductility, and the mechanical reversible reflection color of the blue phase liquid crystal elastomer can be flexibly adjusted in almost the whole visible light wave band and can be stretched to 2 times or more of the original length.
The film exhibits robust, fast and reversible mechanical color change response to stretching and compression under typical loads provided, such that the mechanically reversible reflective color of the stretchable blue phase liquid crystalline elastomer can be flexibly tuned over almost the entire visible light band, and can be stretched to more than 2 times its original length. The combination of the stretchable characteristic of the blue phase liquid crystal elastomer and the unique optical 3D nano structure has good application prospect in the future.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a photograph of a blue phase liquid crystalline elastomer prepared according to the present invention.
FIG. 2 is a reflection spectrum and a corresponding POM chart of a blue phase liquid crystal elastomer prepared by the invention.
FIG. 3 is a graph showing the tensile properties of the blue phase liquid crystalline elastomer prepared according to the present invention.
FIG. 4 is a graph of the elastic modulus and the spectrum test data of the blue phase liquid crystal elastomer prepared by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An object of the present invention is to provide a stretchable blue phase liquid crystal elastomer which can improve texture morphology and obtain high reflectance property by changing a click chemistry reaction (e.g., michael addition) reaction time before photopolymerization, and the polymerized blue phase liquid crystal elastomer has good tensile property.
Another object of the present invention is to provide a method for preparing a stretchable blue phase liquid crystal elastomer, which is simple to operate, low in cost, and expandable to various material systems.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the first aspect of the present invention provides a stretchable blue phase liquid crystal elastomer, which is prepared from components such as an acrylate photopolymerizable monomer, a chiral group or chiral material, a photoinitiator, a click reaction crosslinking monomer such as thiol, and a catalyst.
The blue phase liquid crystal elastomer provided by the invention can also contain non-polymerizable small molecular liquid crystal and a chiral material.
The achiral small molecule liquid crystal of the present invention refers to a liquid crystal molecule in a rod shape, and is a non-polymerizable nematic liquid crystal molecule, and may be a liquid crystal molecule having the following formula:
the acrylate polymerizable monomer in the components has a single functional group or a multifunctional group and can polymerize nematic liquid crystal molecules; chiral materials refer to molecules having chiral properties; the photoinitiator refers to the acrylate polymerizable monomer capable of being photopolymerized under the irradiation of light; the click crosslinking monomer added in the components can be crosslinked with the double bond of the acrylate polymerizable monomer.
In the specific implementation process, the reaction generated by crosslinking the group of the click crosslinking monomer and the double bond of the acrylate polymerizable monomer before the photopolymerization of the blue-phase liquid crystal elastomer has important influence on the formation and reflectivity of the blue-phase liquid crystal texture, and the formation and reflectivity of the blue-phase liquid crystal texture can be regulated and controlled by adjusting the reaction time.
According to the blue phase liquid crystal film composition provided by the invention, the achiral small molecular liquid crystal, the acrylate polymerizable monomer, the chiral material, the photoinitiator, the click crosslinking monomer and the catalyst participate together to form a blue phase structure, and the blue phase structure is stabilized while the self-assembly of the blue phase liquid crystal is regulated and controlled.
Preferably, the acrylate photopolymerizable monomer is selected from one or more of RM105, C3M, or C6M.
RM105 refers to
C3M means
C6M means
Preferably, the chiral material is one or more of S5011, R1011, S1011, R811, S811, or CB 15.
S5011 and R5011 refer to
R1011 and S1011 mean
S811 and R811 mean
CB15 refers to
Preferably, the initiator is the photoinitiator IRG 184.
IRG184 refers to
Preferably, the thiol crosslinking monomer is one or more of EDDET, PETMP or TTMP.
EDDET refers to
PETMP means
TTMP refers to
Preferably, the catalyst is DPA.
DPA means
According to a second aspect of the present invention, there is also provided a method for preparing a stretchable blue phase liquid crystal elastomer, comprising: mixing and heating 46-48 wt% of achiral small molecular liquid crystal, 38.1 wt% of acrylate photopolymerizable monomer, 2-4 wt% of chiral material and 0.3 wt% of photoinitiator to be isotropic, and uniformly stirring; cooling to room temperature, adding catalyst DPA, and stirring uniformly; adding a thiol crosslinking monomer EDDET and uniformly stirring to obtain a liquid crystal precursor; heating the mixture to a liquid crystal clearing point, and filling the liquid crystal clearing point into a liquid crystal box with the thickness of 8-60 mu m; cooling the temperature of the liquid crystal box to enable the mixture to reach a blue phase state and stand for 0-360min, and controlling the cooling speed within 0.01-10 ℃/min; the blue phase state is processed at the light intensity of 2mW/cm2And irradiating the mixture for 10 s-30 min under the ultraviolet light, and taking out the mixture from the liquid crystal box to obtain the stretchable blue-phase liquid crystal elastomer.
The invention has the beneficial effects that:
the blue phase liquid crystal provided by the embodiment of the invention is uniformly colored and has high reflectivity because the blue phase is influenced by the reaction of the click crosslinking monomer and the acrylate polymerizable monomer under the action of the catalyst.
The click chemical reaction process can induce the liquid crystal molecules to self-assemble to construct a blue phase liquid crystal structure. The blue phase liquid crystal elastomer has good mechanical ductility due to cooperative response of deformation and discoloration, and the mechanical reversible reflection color of the blue phase liquid crystal elastomer can be flexibly adjusted in almost the whole visible light waveband and can be stretched to 2 times or more of the original length, namely the blue phase liquid crystal elastomer can be stretched to 2 times or more of the length of the blue phase liquid crystal elastomer in a static state (without the action of tensile force) under the action of tensile force.
The film exhibits robust, fast and reversible mechanical color change response to stretching and compression under typical loads provided, such that the mechanically reversible reflective color of the stretchable blue phase liquid crystalline elastomer can be flexibly tuned over almost the entire visible light band, and can be stretched to more than 2 times its original length. The combination of the stretchable characteristic of the blue phase liquid crystal elastomer and the unique optical 3D nano structure has good application prospect in the future.
Example 1
Respectively comprises the following components in percentage by mass: 47.2 percent, 38.1 percent, 2.8 percent and 0.3 percent (which form a whole with 100 percent of mass together with the catalyst and the crosslinking monomer added subsequently) of achiral small molecular liquid crystal, acrylate photopolymerizable monomers C3M and RM105, chiral material R5011 and photoinitiator IRG 184;
heating to 140 deg.C with a hot plate to dissolve the above mixture, magnetically stirring for 30min, and cooling to room temperature to obtain a uniform mixture;
adding 0.15% of catalyst DPA into the mixture, and magnetically stirring at room temperature for 10 min;
adding 11.4 mass percent of thiol crosslinking monomer EDDET into the mixture, and magnetically stirring at room temperature for 10min to obtain a liquid crystal precursor;
heating the liquid crystal precursor to a clearing point of 35 ℃, and pouring the liquid crystal precursor into a parallel-oriented liquid crystal box with the thickness of 60 mu m arranged on a hot table;
cooling to 26.7 deg.C at a cooling rate of 0.3 deg.C/min at 35 deg.C to obtain blue phase, and standing for 150 min;
using 365nm ultraviolet ray at 6mW/cm2Irradiating at 26.7 deg.C for 10 min;
and opening the liquid crystal box to obtain the stretchable and uniformly colored blue phase liquid crystal elastomer. The elastomer appears red as shown on the right side of fig. 1, corresponding to a central wavelength of 628nm in the reflection spectrum, as shown in the right curve of fig. 2.
Example 2
The mass ratio is respectively as follows: 46.9 percent, 38.1 percent, 3.1 percent and 0.3 percent (which form a whole with 100 percent of mass together with the subsequently added base catalyst and the crosslinking monomer) of achiral small molecular liquid crystal, acrylate photopolymerizable monomers C3M and RM105, chiral material R5011 and photoinitiator IRG 184;
heating to 140 deg.C with a hot plate to dissolve the above mixture, magnetically stirring for 30min, and cooling to room temperature to obtain a uniform mixture;
adding 0.15% of catalyst DPA into the mixture, and magnetically stirring at room temperature for 10 min;
adding 11.4 mass percent of thiol crosslinking monomer EDDET into the mixture, and magnetically stirring at room temperature for 10min to obtain a liquid crystal precursor;
heating the liquid crystal precursor to the clearing point of 35 ℃, and pouring the liquid crystal precursor into a parallel alignment liquid crystal box with the thickness of 60 mu m arranged on a hot bench
Cooling to 26.7 deg.C at a cooling rate of 0.3 deg.C/min at 35 deg.C to obtain blue phase, and standing for 150 min;
using 365nm ultraviolet ray at 6mW/cm2Irradiating at 26.7 deg.C for 10 min;
and opening the liquid crystal box to obtain the stretchable and uniformly colored blue phase liquid crystal elastomer. The elastomer appears green as shown in the middle of fig. 1, corresponding to a reflection spectrum with a center wavelength of 542nm, as shown in the middle curve of fig. 2.
Example 3
The mass ratio is respectively as follows: 46.5 percent, 38.1 percent, 3.5 percent and 0.3 percent (which form a whole with 100 percent of mass together with a catalyst and a crosslinking monomer added subsequently) of achiral small molecular liquid crystal, acrylate photopolymerizable monomers C3M and RM105, a chiral material R5011 and a photoinitiator IRG 184;
heating to 140 deg.C with a hot plate to dissolve the above mixture, magnetically stirring for 30min, and cooling to room temperature to obtain a uniform mixture;
adding 0.15% of catalyst DPA into the mixture, and magnetically stirring at room temperature for 10 min;
adding 11.4 mass percent of thiol crosslinking monomer EDDET into the mixture, and magnetically stirring at room temperature for 10min to obtain a liquid crystal precursor;
heating the liquid crystal precursor to the clearing point of 35 ℃, and pouring the liquid crystal precursor into a parallel alignment liquid crystal box with the thickness of 60 mu m arranged on a hot bench
Cooling to 26.7 deg.C at a cooling rate of 0.3 deg.C/min at 35 deg.C to obtain blue phase, and standing for 150 min;
using 365nm ultraviolet ray at 6mW/cm2Irradiating at 26.7 deg.C for 10 min;
and opening the liquid crystal box to obtain the stretchable and uniformly colored blue phase liquid crystal elastomer. The elastomer appears blue as shown on the left side of fig. 1, corresponding to a reflection spectrum centered at 471nm, as shown in the left curve of fig. 2.
In the present invention, the chain extension reaction occurs during the michael addition by catalytically promoting the bonding of the thiol compound to the polymer. After obtaining proper cross-linking connection, the photopolymerization is carried out, thereby achieving the purpose of controlling cross-linking. The chain extension reaction not only can effectively reduce the crosslinking density, but also can connect the thiol crosslinking monomer with the acrylate polymerizable monomer in the Michael addition reaction process, thereby reducing the free non-medium in the liquid crystal mixture, stabilizing the structure of the blue phase and endowing the blue phase liquid crystal with elasticity, as shown in figure 3, the stretchable blue phase liquid crystal elastomer prepared according to the embodiment 1 has the central wavelength movement amount of 186nm, the stretchable blue phase liquid crystal elastomer can be stretched to 1.3 times of the original length at the moment, and the elastic modulus is 0.012 MPa; the maximum elongation was 3.1 times the original length, at which the modulus of elasticity was 0.034MPa (FIG. 4).
The foregoing embodiments are merely illustrative of the principles of this invention and its efficacy, rather than limiting it, and various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (10)
1. A stretchable blue phase liquid crystal elastomer is characterized in that raw materials for preparing the stretchable blue phase liquid crystal elastomer comprise: the liquid crystal material comprises achiral small molecular liquid crystal, a photopolymerisable monomer, a chiral material, a photoinitiator and a click reaction crosslinking monomer, wherein the achiral small molecular liquid crystal is a nematic liquid crystal molecule of which the liquid crystal molecule is rod-shaped and non-polymerisable.
2. An elastomeric body in accordance with claim 1, wherein said body is stretchable to more than 2 times its original length;
preferably, the achiral small-molecule liquid crystal, the photopolymerizable monomer, the chiral material, the photoinitiator and the click reaction crosslinking monomer respectively comprise, by mass: 46-49 wt%, 38.1 wt%, 1-4 wt%, 0.3 wt%, 11.4 wt%;
preferably, the raw materials further comprise: and 0.15wt% of catalyst.
3. An elastomer as claimed in claim 1 wherein said photopolymerizable monomers comprise acrylate, and/or siloxane based photopolymerizable monomers; the click reaction crosslinking monomer comprises thiol click reaction crosslinking monomer;
preferably, the chiral material is one or more of S5011, R1011, S1011, R811, S811, CB15 or LC 756;
preferably, the photoinitiator is a uv photoinitiator;
preferably, the photoinitiator is IRG 184;
preferably, the raw materials further comprise: the catalyst is DPA.
4. An elastomer as claimed in claim 3 wherein said acrylate photopolymerizable monomer is selected from one or more of RM105, C3M or C6M.
5. An elastomer as claimed in claim 3 wherein said thiol based click-reacting crosslinking monomer is one or more of EDDET, PETMP and TTMP.
6. The elastomer of claim 1, wherein the raw materials for preparing the stretchable blue phase liquid crystal elastomer comprise: acrylate photopolymerizable monomers RM105 and C3M, a photoinitiator IRG184, a thiol photopolymerizable monomer EDDET, a catalyst DPA, a chiral material R5011 and achiral small molecule liquid crystal.
7. A preparation method of a stretchable blue-phase liquid crystal elastomer is characterized by comprising the following steps:
1) mixing and heating the achiral small molecular liquid crystal, the photopolymerizable monomer, the chiral material and the photoinitiator to be isotropic, and uniformly stirring; cooling to room temperature, adding a catalyst diluted by achiral small molecular liquid crystal, and uniformly stirring; adding a click reaction crosslinking monomer and uniformly stirring to obtain a liquid crystal precursor;
2) heating the liquid crystal precursor to a liquid crystal clearing point, and filling the liquid crystal precursor into a container or coating the liquid crystal precursor on a substrate;
3) cooling the temperature of the container or the substrate to enable the liquid crystal precursor to reach a blue phase state, and controlling the cooling speed to be within 0.01-10 ℃/min;
4) and irradiating the blue phase state for 10 s-30 min under light, and taking out the blue phase state from the container or the substrate to obtain the stretchable blue phase liquid crystal elastomer.
8. The method of claim 7, wherein the container comprises a liquid crystal cell;
preferably, the thickness of the liquid crystal box is 8-60 μm;
preferably, the substrate comprises glass, plastic, or a wall;
preferably, the light includes ultraviolet light, visible light, and infrared light;
preferably, the irradiation intensity of the light is 2mW/cm2The above.
9. The method of claim 7, wherein the elastomer is stretched to more than 2 times its original length;
preferably, the photopolymerizable monomer comprises an acrylate-based photopolymerizable monomer;
preferably, the click-reactive cross-linking monomer comprises a thiol type click-reactive cross-linking monomer;
preferably, the chiral material is one or more of S5011, R1011, S1011, R811, S811, or CB 15; the initiator is an ultraviolet initiator IRG 184;
preferably, the catalyst is DPA;
preferably, the acrylate photopolymerizable monomer is selected from one or more of RM105, C3M and C6M;
preferably, the thiol click-reaction crosslinking monomer is one or more of EDDET, PETMP and TTMP.
10. A stretchable blue phase liquid crystalline elastomer prepared by the method of any one of claims 7 to 9.
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| CN115449112A (en) * | 2022-09-05 | 2022-12-09 | 苏州大学 | Cholesteric liquid crystal elastomer composite film and preparation method thereof |
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| CN110256811A (en) * | 2019-05-15 | 2019-09-20 | 北京大学 | A kind of method that heat-ultraviolet step-by-step polymerization prepares liquid crystal light modulation film |
| CN113004909A (en) * | 2021-03-08 | 2021-06-22 | 西京学院 | Composite stable blue phase liquid crystal composition and preparation method and application thereof |
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| CN110256811A (en) * | 2019-05-15 | 2019-09-20 | 北京大学 | A kind of method that heat-ultraviolet step-by-step polymerization prepares liquid crystal light modulation film |
| CN113004909A (en) * | 2021-03-08 | 2021-06-22 | 西京学院 | Composite stable blue phase liquid crystal composition and preparation method and application thereof |
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| OSMAN KONURAY等: "State of the Art in Dual-Curing Acrylate Systems", POLYMERS, vol. 10, no. 178, pages 1 - 24 * |
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| CN115449112A (en) * | 2022-09-05 | 2022-12-09 | 苏州大学 | Cholesteric liquid crystal elastomer composite film and preparation method thereof |
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