CN106883863B - The application of liquid crystal elastic body driving element and preparation method thereof and liquid crystal elastic body - Google Patents
The application of liquid crystal elastic body driving element and preparation method thereof and liquid crystal elastic body Download PDFInfo
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- CN106883863B CN106883863B CN201710179174.2A CN201710179174A CN106883863B CN 106883863 B CN106883863 B CN 106883863B CN 201710179174 A CN201710179174 A CN 201710179174A CN 106883863 B CN106883863 B CN 106883863B
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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
- C09K19/38—Polymers
- C09K19/3833—Polymers with mesogenic groups in the side chain
- C09K19/3842—Polyvinyl derivatives
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- C08F222/10—Esters
- C08F222/12—Esters of phenols or saturated alcohols
- C08F222/20—Esters containing oxygen in addition to the carboxy oxygen
Abstract
The present invention relates to a kind of liquid crystal elastic body driving elements, including liquid crystal elastic body, reversible deformation can occurs in it near liquid crystal transition temperature, it includes the liquid crystal molecule being connected with each other, molecule, flexible chain and the crosslinking agent of the ether group containing allyl sulfide that liquid crystal elastic body, which has cross-linked network, cross-linked network,.The invention further relates to a kind of preparation methods of liquid crystal elastic body driving element, including：Liquid crystal molecule, the molecule of the ether group containing allyl sulfide, flexible chain and crosslinking agent are added in solvent and form mixture solution；Mixture solution is subjected to polymerisation, makes liquid crystal molecule, molecule, flexible chain and the crosslinking agent of the ether group containing allyl sulfide are polymerized to cross-linked network, formation liquid crystal elastic body；Orientation process is carried out to liquid crystal elastic body, obtains liquid crystal elastic body driving element.The invention further relates to a kind of application of liquid crystal elastic body, liquid crystal elastic body is used as driving element, is applied to artificial-muscle, blind person's display, inductor, microfluidic system valve or intelligent response boundary material.
Description
Technical field
The present invention relates to liquid crystal elastic body driving element field more particularly to a kind of liquid crystal elastic body driving elements and its system
The application of Preparation Method and liquid crystal elastic body.
Background technology
Liquid crystal elastic body driving element is stimulation-response that the entropic elasticity of a kind of existing elastomer has the order of liquid crystal again
Property material, by reversible mechanical response can be generated under the stimulations such as light, heat, electricity, driver, inductor, artificial-muscle with
And light moves the fields such as motor and is with a wide range of applications.But liquid crystal elastic body driving element must have in internal liquid crystal unit
Have unified orientation and it is fixed in the case of can show reversible mechanical response driving.Liquid crystal elastic body is preparing completion
Afterwards, fixed orientation could be had after special orientation processing by generally requiring, and be applied to liquid crystal elastic body driving element, and
It is always to limit the bottleneck problem of liquid crystal elastic body driving element development to be orientated processing problems.
At present, there are problems in existing method for alignment.Widely used two steps cross-linking method step at present
It is rapid cumbersome, and the tentatively crosslinked degree needs of prepolymer are accurately controlled, second step crosslinking meeting again is carried out in a stretched state
Larger internal stress is brought, to influence the service life of liquid crystal elastic body driving element.
As the research to dynamic covalent bond is gradually goed deep into, dynamic covalent bond, which becomes, solves liquid crystal elastic body processing bottleneck
One of scheme.By being introduced into dynamic covalent bond to liquid crystal elastic body, while giving certain environmental stimuli, material is stretched
For material so that network structure changes, internal stress obtains fast relaxation, to fixed existing orientation.But such scheme is at present
There are some problems, for example introduce transesterification system, the problem that thermal response repeatability can be brought bad, after multiple high/low temperature cycle
Orientation gradually disappears, and the orientation of liquid crystal elastic body does not tolerate solvent, and being orientated after contacting solvent will disappear.
Invention content
Based on this, it is necessary to a kind of heat-resisting and swelling resistance liquid crystal elastic body driving element and preparation method thereof is provided, with
And the application of liquid crystal elastic body.
A kind of liquid crystal elastic body driving element, including liquid crystal elastic body, the liquid crystal elastic body can be in liquid crystalline transition temperature
Reversible deformation nearby occurs for degree, and it includes the liquid being connected with each other that the liquid crystal elastic body, which has cross-linked network, the cross-linked network,
Molecule, flexible chain and the crosslinking agent of brilliant molecule, the ether group containing allyl sulfide.
The shape of the liquid crystal elastic body driving element is unlimited in one of the embodiments, including sheet, tubulose or column
Shape.
The ranging from 30-100% of the reversible deformation of liquid crystal elastic body driving element in one of the embodiments,.
A kind of preparation method of liquid crystal elastic body driving element, including：By liquid crystal molecule, point of the ether group containing allyl sulfide
Son, flexible chain and crosslinking agent are added in solvent and form mixture solution；The mixture solution is subjected to polymerisation, makes institute
Liquid crystal molecule, the molecule of the ether group containing allyl sulfide, the flexible chain and the crosslinking agent is stated to polymerize to form cross-linked network
Network forms liquid crystal elastic body；And orientation process is carried out to the liquid crystal elastic body, obtain the liquid crystal elastic body driving member
Part.
Further comprise the photoinitiator mixture solution is added in one of the embodiments,.
Further comprise the catalyst mixture solution is added in one of the embodiments,.
The orientation process includes in one of the embodiments,：Deformation process is carried out to the liquid crystal elastic body, makes institute
Stating liquid crystal elastic body has deformation quantity；And the liquid crystal elastic body with the deformation quantity is carried out at free radical induction
Reason, it is photo-irradiation treatment or heat treatment that free radical, which induces processing, obtains the liquid crystal elastic body driving element.
It is photo-irradiation treatment that the free radical, which induces processing, in one of the embodiments, and the wavelength of the photo-irradiation treatment is
405nm or 365nm, light intensity 24-36mw/cm2Or 28-32mw/cm2, light application time 120-180s.
A kind of application of liquid crystal elastic body, the liquid crystal elastic body are used for liquid crystal elastic body driving element, the liquid crystal bullet
Property body near liquid crystal transition temperature have reversible telescopic deformation, the liquid crystal elastic body have cross-linked network, the crosslinking
Network includes the liquid crystal molecule being connected with each other, molecule, flexible chain and the crosslinking agent of the ether group containing allyl sulfide.
The liquid crystal elastic body driving element in one of the embodiments, be applied to artificial-muscle, blind person's display,
Inductor, light move motor, microfluidic system valve or intelligent response boundary material.
The application of liquid crystal elastic body driving element of the present invention and preparation method thereof and liquid crystal elastic body, with allyl
Sulfide group is as the dynamic covalent bond for changing network structure, the side for passing through addition with liquid crystal molecule, flexible chain and crosslinking agent
Formula is bonded, and carries out orientation process, so that liquid crystal elastic body is had the orientation of stationary arrangement, is obtained heat resistance and solvent resistance is equal
Preferable liquid crystal elastic body driving element, the orientation for solving liquid crystal elastic body under transesterification system are vulnerable to asking for high temperature
Topic has preferable application prospect, such as can be widely used in artificial-muscle, blind person's display, inductor, light and move horse
It reaches, microfluidic system valve or intelligent response boundary material etc..
Description of the drawings
Fig. 1 is the photo of the sheet liquid crystal elastic body driving element of the embodiment of the present invention；
Fig. 2 is the photo of the tubulose liquid crystal elastic body driving element of the embodiment of the present invention；
Fig. 3 is the photo of the column liquid crystal elastic body driving element of the embodiment of the present invention；
Fig. 4 is the flow chart of the preparation method of the liquid crystal elastic body driving element of the embodiment of the present invention；
Fig. 5 is the dynamic exchange schematic diagram of the allyl sulfide ether group of the embodiment of the present invention；
Fig. 6 is the spontaneous flexible schematic diagram of liquid crystal elastic body driving element of the embodiment of the present invention 1；
Fig. 7 is the front and back comparison diagram of the liquid crystal elastic body driving element swelling of the embodiment of the present invention 1；
Fig. 8 is strain-hygrogram of the liquid crystal elastic body driving element of the embodiment of the present invention 1；
Fig. 9 is the spontaneous flexible schematic diagram of liquid crystal elastic body driving element of the embodiment of the present invention 2.
Specific implementation mode
In order to make the purpose of the present invention, technical solution and technique effect be more clearly understood, below in conjunction with attached drawing to this hair
Bright specific embodiment is described.It should be appreciated that described herein, specific examples are only used to explain the present invention, and does not have to
It is of the invention in limiting.
The present invention provides a kind of liquid crystal elastic body driving element, including liquid crystal elastic body, can be attached in liquid crystal transition temperature
Reversible deformation closely occurs, there is liquid crystal elastic body cross-linked network, cross-linked network to include the liquid crystal molecule being connected with each other, contain allyl
Molecule, flexible chain and the crosslinking agent of base sulfide group.Allyl sulfide ether group is a kind of group only sensitive to free radical,
It can keep stable in solvent, dynamic exchange will not occur and change network structure, after being orientated, the orientation of liquid crystal elastic body
It will not disappear during swelling.Due to allyl sulfide ether group only to free radical it is sensitive, protected in the case of no free radical
It is fixed to keep steady, and dynamic exchange occurs there are free radical.After the orientation of liquid crystal elastic body is fixed, removed by being swollen
Residual initiators, heating and cooling or solvent stimulation repeatedly can't make to generate free radicals in network structure, to network knot
Dynamic exchange would not occur for the allyl sulfide ether group in structure, and the orientation of liquid crystal elastic body can be always maintained at so that liquid
Brilliant elastomer driving element has the reversible deformation of the stabilization near liquid crystal transition temperature.
Specifically, the reversible deformation of liquid crystal elastic body driving element ranges preferably from 30-100%, so that driving element has
There is more preferably driveability.It is reversible when axial direction (length direction) of the direction of reversible deformation along liquid crystal elastic body driving element
Deformation ranges preferably from 30-60%；When the direction of reversible deformation is along the radial direction (thickness direction) of liquid crystal elastic body driving element
When, reversible deformation ranges preferably from 50-100%.
The structural formula of allyl sulfide ether group is：
Fig. 1, Fig. 2 and Fig. 3 are referred to, liquid crystal elastic body driving element there can be various shapes, such as sheet, tubulose and column
Shape etc..Liquid crystal elastic body driving element of different shapes can meet different purposes demands, to expand liquid crystal elastic body
The application range of driving element.
Referring to Fig. 4, the present invention also provides a kind of preparation methods of liquid crystal elastic body driving element, including：
Liquid crystal molecule, the molecule of the ether group containing allyl sulfide, flexible chain and crosslinking agent are added in solvent step S110
Form mixture solution；
Mixture solution is carried out polymerisation by step S120, make liquid crystal molecule, the ether group containing allyl sulfide molecule,
Flexible chain and crosslinking agent polymerize to form cross-linked network, form liquid crystal elastic body；And
Step S130 carries out orientation process to the liquid crystal elastic body, obtains liquid crystal elastic body driving element.
Liquid crystal molecule be preferably with rigid structure liquid crystal unit, carbon atom number be 3-6 flexible chain structure and
It can be with flexible chain, the end group of crosslinking agent reaction forming.End group is preferably acrylate group, epoxy group, isocyanate groups
Or double bond group.When end group is selected from acrylate group, liquid crystal molecule is preferably RM257 or RM82.The structural formula of RM257 is such as
Shown in formula (I), shown in the structural formula such as formula (II) of RM82.In addition, liquid crystal molecule can also be biphenyl class, triphenylene class or benzene first
Nitrile.
The molecule of the ether group containing allyl sulfide has allyl sulfide ether group and can be with flexible chain, crosslinking agent reaction forming
End group, preferably there is flexible chain structure, the type of end group is unlimited, as long as can be by being reacted into cross-linked network.
And the length of flexible chain structure and the type of end group can be adjusted according to different application demands, the end of end group and liquid crystal molecule
Base is identical, preferably acrylate group, epoxy group, isocyanate groups or double bond group.In one embodiment, contain allyl
The molecule of base sulfide group is MBTA, shown in structural formula such as formula (III).
The end group of flexible chain need to coordinate with the end group of liquid crystal molecule, the molecule of the ether group containing allyl sulfide, can occur anti-
It answers.When the end group of liquid crystal molecule is acrylate group or double bond group, the end group of flexible chain corresponds to sulfydryl；When liquid crystal point
When the end group of son is epoxy group, the end group of flexible chain corresponds to carboxyl or amino；When the end group of liquid crystal molecule is isocyanates
When group, the end group of flexible chain corresponds to hydroxyl.When end group is sulfydryl, the general molecular formula of flexible chain can be CnH2n+2OmS2,
Wherein, n >=6, m=0,2,4 etc..In one embodiment, flexible chain is preferably 2,2'- (ethylenedioxy) diethyl mercaptan (DODT),
Shown in structural formula such as formula (IV).
Can be participated in crosslinking agent reaction functional group number need to be more than or equal to 3, end group is identical as the end group of flexible chain, be both needed to
Liquid crystal molecule, the ether group containing allyl sulfide molecule end group cooperation.In one embodiment, end group is preferably sulfydryl, corresponding,
Crosslinking agent is preferably four (3- mercaptopropionic acids) pentaerythritol esters, molecular formula C17H28O8S4, shown in structural formula such as formula (V).
Solvent is organic solvent, and volatility is good, in low boiling point, such as dichloromethane, tetrahydrofuran, toluene and chloroform
It is at least one.
In one embodiment, the mixed proportion of liquid crystal molecule, the molecule of the ether group containing allyl sulfide, flexible chain and crosslinking agent
Preferably stoichiometric ratio, for example, when all having acrylate group in molecule of the liquid crystal molecule with the ether group containing allyl sulfide,
And flexible chain and crosslinking agent be when containing sulfydryl, the molar ratio of acrylate group and sulfydryl in mixture solution is 1:1-1:
1.1, to react fully, impurity is less.
The preparation method of liquid crystal elastic body driving element further comprises before step S120：Catalyst is added mixed
In polymer solution.The addition of catalyst simplifies the condition of polymerisation so that reaction can carry out at normal temperatures, add simultaneously
Fast reaction rate.Catalyst is preferably at least one of n-hexylamine, di-n-propylamine and triethylamine.
In one embodiment, it before step S120, can further include：Mixture solution is added in photoinitiator
In.
The addition of photoinitiator simplifies the orientation process of liquid crystal elastic body in step S130.Photoinitiator is in mixture
Polymerization process in do not play a role.When after the later stage is orientated by illumination, photoinitiator cracking generates free radicals, and makes alkene
Dynamic exchange occurs for propyl sulfide group, to change network structure, fixed orientation.Photoinitiator is preferably 2,2- dimethoxies
Base -1,2- diphenyl second -1- ketone (Irgacure 651) and bis- (2,4,6- trimethylbenzoyl) phenyl phosphine oxides
At least one of (Irgacure 819).
In another embodiment, it before step S120, can further include：Mixture solution is added in thermal initiator
In.Thermal initiator can be azodiisobutyronitrile, benzoyl peroxide etc..
In the step s 120, it can also further comprise forming processes, mixture solution is injected in mold and is molded.It is logical
It crosses and injects mixture solution in different molds, liquid crystal elastic body of different shapes can be prepared, to meet different applications
Demand.
Specifically, by mixture solution rapid dumps in substrate and it can be made to spread out and apply pressure to get to sheet
Liquid crystal elastic body；Mixture solution can also be rapidly injected after straight forming in polytetrafluoroethylene (PTFE) duct, or injection in duct
In be inserted into diameter be less than channel diameter solid pole, cylindric liquid crystal elastic body or circular tube shaped liquid crystal elastic body can be obtained.
It should be understood that this preparation method is only to prepare a kind of preferred method of liquid crystal elastic body driving element, lead to
It crosses allyl sulfide ether group and the covalent exchange interaction of this dynamic of addition-fracture chain tra nsfer effect that free radical regulates and controls is introduced into liquid
In brilliant elastomeric material, and cross-linking system is constructed by the addition reaction of Thiol-acrylate, is formed with allyl sulfide ether
Group is the liquid crystal elastic body of dynamic covalent bond, and becomes liquid crystal elastic body driving element by orientation process.It is also an option that it
Its preparation method, as long as the liquid crystal elastic body using allyl sulfide ether group as dynamic covalent bond can be formed.
In step s 130, specifically, orientation process includes：
Step S131 carries out first time deformation process to the liquid crystal elastic body, the liquid crystal elastic body is made to have first
Deformation quantity；And
Step S132 carries out free radical induction processing to the liquid crystal elastic body with the first deformation quantity, obtains liquid crystal
Elastomer driving element.
Specifically, before step S131, liquid crystal elastic body has original shape.In step S131, deformation process is preferred
For stretch processing.The position of stretching can be at least one of whole or part, and the direction of stretching can be any direction,
Such as can be along at least one of the length direction of liquid crystal elastic body or thickness direction.It selects to draw according to different needs
The position and direction stretched.A variety of application demands can be met, expand application range.
More specifically, the numerical value of the first deformation quantity has larger range of choice, is arranged as required to.With sheet liquid crystal
For elastomer, when draw direction (differently- oriented directivity) is along the length direction of sheet liquid crystal elastic body, the first deformation quantity is preferably
100-200%.When draw direction (differently- oriented directivity) is along the thickness direction of sheet liquid crystal elastic body, and the thickness of sheet liquid crystal elastic body
When degree is 0.3mm, the first deformation quantity is preferably 4-6mm.The numerical value of first deformation quantity can influence the degree being finally orientated, the first shape
Variable value is bigger, and the degree of orientation of liquid crystal elastic body is higher, and the degree of orientation that can be finally fixed up is also higher, liquid
The reversible stroke that brilliant elastomer driving element occurs near liquid crystal transition temperature is also bigger.
In step S132, when photoinitiator is added, free radical induction processing can be photo-irradiation treatment, and thermal initiation is being added
When agent, or heat treatment.Photo-irradiation treatment is preferred processing mode, without additional heating equipment, simplifies behaviour
Make.Illumination wavelength, light intensity and time are determined by the type of photoinitiator.Preferably, the wavelength of photo-irradiation treatment be preferably 405nm or
365nm, light intensity are preferably 24-36mw/cm2Or 28-32mw/cm2, light application time is preferably 120-180s.
Referring to Fig. 5, after by illumination, photoinitiator cracking generates free radicals.Under the action of free radical, allyl sulfide
Addition reaction occurs for ether group, forms the covalent intermediate of allyl sulphide dynamic, and occurs to be broken chain tra nsfer simultaneously, generates dynamic
It exchanges, to change the structure of cross-linked network, the orientation of the first time deformation process generation of fixed gained makes liquid crystal elastic body drive
Dynamic element has reversible telescopic deformation.
Preferably, orientation process further comprises：Liquid crystal elastic body to inducing processing by free radical applies second
Deformation process makes liquid crystal elastic body have the second deformation quantity.
Specifically, the second deformation quantity is identical as the deformation direction of the first deformation quantities of step S131, deformation position is also identical.Step
After-applied second of the deformation process of rapid S132, can further fix the orientation of liquid crystal elastic body, to increase liquid crystal elastic body
The reversible deformation quantity generated near liquid crystal transition temperature.
When draw direction is the length direction of liquid crystal elastic body, the second deformation quantity is preferably 150-250%.When stretching side
When to thickness direction for liquid crystal elastic body, the second deformation quantity is preferably 5-7mm.It preferably, can be with after the second deformation quantity generates
10-20min is kept, to further increase the reversible deformation quantity that liquid crystal elastic body generates near liquid crystal transition temperature.
In one embodiment, orientation process can also further comprise：To the liquid crystal elastic body Jing Guo second of deformation process
It is heat-treated.Heat treatment can be such that liquid crystal elastic body shrinks, and generate after shrinking, then liquid crystal elastic body is placed at room temperature, lead to
Cross whether observation liquid crystal elastic body is extended, you can judge be orientated whether fix success.
Specifically, the temperature of heat treatment is preferably 80-100 DEG C, the time of heat treatment is preferably 2-5min.
Preferably, after heat treatment, after the orientation of liquid crystal elastic body is fixed, remaining initiator is removed.To have
The liquid crystal elastic body of fixed orientation places swelling in organic solvent and removes remaining initiator.Organic solvent can be dichloromethane
Alkane, tetrahydrofuran, toluene or chloroform.
It is driven it should be noted that the preparation method of the present embodiment can prepare the liquid crystal elastic body with whole reversible deformation
Dynamic element can also prepare the liquid crystal elastic body driving element with single local or multiple local reversible deformation.Reversible shape
It the direction of change can be to be one-dimensional, or multidimensional.The combined transformation that multiple positions can be carried out with multidimensional, to realize
Increasingly complex reversible deformation.According to demand, position and the dimension for selecting reversible deformation, make liquid crystal elastic body driving element have
The application range of bigger.
The embodiment of the present invention also provides a kind of application of liquid crystal elastic body, and the liquid crystal elastic body is used for liquid crystal after orientation
Elastomer driving element, the liquid crystal elastic body have reversible telescopic deformation, the liquid crystal bullet near liquid crystal transition temperature
Property body have cross-linked network, cross-linked network include be connected with each other liquid crystal molecule, the ether group containing allyl sulfide molecule, flexible chain
And crosslinking agent.The liquid crystal elastic body can be applied to artificial-muscle, blind person shows as liquid crystal elastic body driving element
Device, inductor, light move motor, microfluidic system valve or intelligent response boundary material etc..
Embodiment 1
By the liquid crystal molecule (RM257) of 0.45mmol, 5- methyl-benzotriazole (MBTA) of 0.05mmol, 0.455mmol
2,2'- (ethylenedioxy) diethyl mercaptan (DODT) and 0.023mmol four (3- mercaptopropionic acids) pentaerythritol esters (PETMP)
It is dissolved in dichloromethane, obtains mixed solution.By 2,2- dimethoxy -1,2- diphenyl second -1- ketone of 2wt%
(Irgacure651) and bis- (2,4,6- trimethylbenzoyls) phenyl phosphine oxides (Irgacure819) of 1wt% are added and mix
It closes in solution, and the di-n-propylamine of 10wt% is dissolved in dichloromethane and is added in mixture solution, it is molten to form reactant
Liquid.In substrate and it is made to spread out reactant solution rapid dumps, carry out polymerisation, and apply pressure, forms liquid crystal elasticity
Body.Liquid crystal elastic body is taken out and dried, the liquid crystal elastic body of sheet is obtained.
To the sheet liquid crystal elastic body with initial length, first time stretching is carried out along its length, its length is made to become
The 250% of initial length.With light intensity it is 30mw/cm by the sheet liquid crystal elastic body under tensional state2, wavelength is the light of 405nm
It irradiates 180 seconds or light intensity is 35mw/cm2, the light irradiation that wavelength is 365nm 120 seconds.Then to the sheet liquid crystal elastic body
It is stretched along length to carrying out second, so that its length is reached the 300% of initial length, and kept for 10 minutes.Again by liquid crystal elasticity
Body is placed in 80 DEG C of thermal station and keeps the temperature 2min, can determine to be orientated whether fix by observing the variation of length after being cooled to room temperature
Success.After orientation is fixed successfully, the sheet liquid crystal elastic body with reversible deformation is placed in dichloromethane and is swollen, it is residual to remove
The initiator Irgacure 651 and Irgacure 819 stayed.
Fig. 6 is referred to, gained sheet liquid crystal elastic body has preferable driving property.It is heated in 80 DEG C of thermal station
After 2 minutes, which is presented contraction state.The sheet liquid crystal elastic body is taken out from 80 DEG C of thermal station and is placed in 25
DEG C at room temperature when, elongation state is presented, driving ratio illustrates that the sheet liquid crystal elastic body has and reversible stretch up to 45.9%
Contracting deformation.Fig. 7 is referred to, can be seen that by the deformation comparison diagram for being swollen front and back and the sheet liquid crystal elastic body is placed in dichloro
After in methane, the telescopic deformation of the sheet liquid crystal elastic body is not also significantly affected, and it is preferable resistance to illustrate that it has
Solvent borne.Fig. 8 is referred to, the sheet liquid crystal elastic body is in continuous 400 minutes high/low temperatures it can be seen from strain-hygrogram
Under cycle stimulation, there is stable repeatable deformation, show that the orientation of the sheet liquid crystal elastic body has preferable heat-resisting quantity.
Illustrate, which has excellent driving property as liquid crystal elastic body driving element.
Embodiment 2
By the liquid crystal molecule (RM257) of 0.45mmol, 5- methyl-benzotriazole (MBTA) of 0.05mmol, 0.455mmol
2,2'- (ethylenedioxy) diethyl mercaptan (DODT) and 0.023mmol four (3- mercaptopropionic acids) pentaerythritol esters (PETMP)
It is dissolved in dichloromethane, obtains mixed solution.By 2,2- dimethoxy -1,2- diphenyl second -1- ketone of 2wt%
(Irgacure651) and bis- (2,4,6- trimethylbenzoyls) phenyl phosphine oxides (Irgacure819) of 1wt% are added and mix
It closes in solution, and the di-n-propylamine of 10wt% is dissolved in dichloromethane and is added in mixture solution, it is molten to form reactant
Liquid.In substrate and it is made to spread out reactant solution rapid dumps, carry out polymerisation, and apply pressure, forms liquid crystal elasticity
Body.Liquid crystal elastic body is taken out and dried, the liquid crystal elastic body of sheet is obtained.
The tablet with pin protrusion is prepared, the vertical range of pin protruding end anomaly plate is about 5mm.By obtained sheet
Shape liquid crystal elastic body is layered on pin protruding end, is not connect piece liquid crystal elastic body with pin protrusion with the thin hardboard with hole
Tactile part is depressed into be bonded with tablet.Then it is 35mw/cm with light intensity2, after wavelength irradiates 180 seconds for the light of 365nm, by liquid crystal
Elastomer is removed from tablet.Liquid crystal elastic body is placed in 80 DEG C of thermal station again and keeps the temperature 2min, can be passed through after being cooled to room temperature
The variation of height of projection is observed to determine whether orientation fixes success.It, will be with reversible raised deformation after orientation is fixed successfully
Sheet liquid crystal elastic body, which is placed in dichloromethane, to be swollen, to remove remaining initiator Irgacure 651 and Irgacure
819。
Fig. 9 is referred to, the sheet liquid crystal elastic body of the present embodiment is put into after single protrusion is orientated 2 in 80 DEG C of thermal station
After minute, contraction state is presented in projection portion, and height of projection declines.By the liquid crystal elastic body of the single protrusion of the tool from 80 DEG C of thermal station
Upper taking-up be placed in 25 DEG C at room temperature when, elongation state is presented in the projection portion, and height of projection rises, and driving ratio reaches
79.4%.Liquid crystal elastic body with reversible raised deformation can be applied to blind person's display as liquid crystal elastic body driving element
In.When temperature is higher than liquid crystal transition temperature, the height of the protrusion declines, and blind person can not obtain sense of touch；When temperature is less than liquid
When crystal transition temperature, the height of the protrusion rises, and blind person can be made to obtain sense of touch.
The application of liquid crystal elastic body driving element of the present invention and preparation method thereof and liquid crystal elastic body, with allyl
Sulfide group is as the dynamic covalent bond for changing cross-linked network, the side for passing through addition with liquid crystal molecule, flexible chain and crosslinking agent
Formula is bonded, and carries out orientation process, so that liquid crystal elastic body is had the orientation of stationary arrangement, is obtained heat resistance and solvent resistance is equal
Preferable liquid crystal elastic body driving element, the orientation for solving liquid crystal elastic body under transesterification system are vulnerable to asking for high temperature
Topic has preferable application prospect, such as can be widely used in artificial-muscle, blind person's display, inductor, light and move horse
It reaches, microfluidic system valve or intelligent response boundary material etc..
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of liquid crystal elastic body driving element, which is characterized in that including liquid crystal elastic body, the liquid crystal elastic body can be in liquid
Reversible deformation nearby occurs for crystal transition temperature, and it includes mutual that the liquid crystal elastic body, which has cross-linked network, the cross-linked network,
The liquid crystal molecule of connection, molecule, flexible chain and the crosslinking agent of the ether group containing allyl sulfide, the ether group containing allyl sulfide
Molecule is used for and the flexible chain and the crosslinking agent reaction forming.
2. liquid crystal elastic body driving element according to claim 1, which is characterized in that the liquid crystal elastic body driving element
Shape include sheet, tubulose or column.
3. liquid crystal elastic body driving element according to claim 1, which is characterized in that the liquid crystal elastic body driving element
The ranging from 30-100% of reversible deformation.
4. a kind of preparation method of liquid crystal elastic body driving element, including:
It is molten that formation mixture in solvent is added in liquid crystal molecule, the molecule of the ether group containing allyl sulfide, flexible chain and crosslinking agent
Liquid；
The mixture solution is subjected to polymerisation, makes molecule and the flexible chain and the institute of the ether group containing allyl sulfide
State crosslinking agent reaction forming, to make the molecule of the liquid crystal molecule, the ether group containing allyl sulfide, the flexible chain and
The crosslinking agent polymerize to form cross-linked network, forms liquid crystal elastic body；And
Orientation process is carried out to the liquid crystal elastic body, obtains the liquid crystal elastic body driving element.
5. the preparation method of liquid crystal elastic body driving element according to claim 4, which is characterized in that further comprise by
The mixture solution is added in photoinitiator.
6. the preparation method of liquid crystal elastic body driving element according to claim 4, which is characterized in that further comprise by
The mixture solution is added in catalyst.
7. the preparation method of liquid crystal elastic body driving element according to claim 4, which is characterized in that the orientation process
Including:
Deformation process is carried out to the liquid crystal elastic body, makes the liquid crystal elastic body that there is deformation quantity；And
Free radical induction processing is carried out to the liquid crystal elastic body with the deformation quantity, it is at illumination that free radical, which induces processing,
Reason or heat treatment, obtain the liquid crystal elastic body driving element.
8. the preparation method of liquid crystal elastic body driving element according to claim 7, which is characterized in that the free radical lures
Hair processing is photo-irradiation treatment, and the wavelength of the photo-irradiation treatment is 405nm or 365nm, light intensity 24-36mw/cm2Or 28-32mw/
cm2, light application time 120-180s.
9. a kind of application of liquid crystal elastic body, which is characterized in that the liquid crystal elastic body is used for liquid crystal elastic body driving element, institute
Stating liquid crystal elastic body, there is reversible telescopic deformation, the liquid crystal elastic body to have cross-linked network near liquid crystal transition temperature,
The cross-linked network includes the liquid crystal molecule being connected with each other, molecule, flexible chain and the crosslinking agent of the ether group containing allyl sulfide, institute
The molecule for stating the ether group containing allyl sulfide is used for and the flexible chain and the crosslinking agent reaction forming.
10. the application of liquid crystal elastic body according to claim 9, which is characterized in that the liquid crystal elastic body driving element,
Motor, microfluidic system valve or intelligent response boundary material are moved applied to artificial-muscle, blind person's display, inductor, light.
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