CN109143712A - A kind of cholesteric liquid crystal composite membrane and its preparation method and application - Google Patents
A kind of cholesteric liquid crystal composite membrane and its preparation method and application Download PDFInfo
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- CN109143712A CN109143712A CN201810970256.3A CN201810970256A CN109143712A CN 109143712 A CN109143712 A CN 109143712A CN 201810970256 A CN201810970256 A CN 201810970256A CN 109143712 A CN109143712 A CN 109143712A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
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- 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
- C09K19/3833—Polymers with mesogenic groups in the side chain
- C09K19/3842—Polyvinyl derivatives
- C09K19/3852—Poly(meth)acrylate derivatives
- C09K19/3861—Poly(meth)acrylate derivatives containing condensed ring systems
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
Abstract
The invention discloses a kind of cholesteric liquid crystal composite membrane and its preparation method and application, which includes the cholesteric crystal layer being stacked and elastomer layer；Wherein, the raw material of the cholesteric crystal layer includes achiral liquid crystal diacrylate, chiral liquid crystal diacrylate, chain extender and photoinitiator；The raw material of the elastomer layer includes elastomer presoma and crosslinking agent.In the above manner, the cholesteric liquid crystal system in cholesteric liquid crystal composite membrane of the present invention has temperature response characteristics, reflection wavelength can be determined by controlling temperature flexible modulation；And the screw pitch of cholesteric crystal layer in composite membrane can be changed by elongation strain to change its reflection wavelength, so as to be applied to the cholesteric liquid crystal composite membrane to prepare the application in strain transducer, antifalsification label or data encryption.
Description
Technical field
The present invention relates to liquid crystal applications Technical Development Areas, and in particular to a kind of cholesteric liquid crystal composite membrane and its preparation side
Method and application.
Background technique
Device based on liquid crystal plays an important role in daily life, especially in a liquid crystal display.Liquid crystal material
It is made of rodlike molecule, these molecules all point to a direction, to make liquid crystal material have orderly phase, but also can be as liquid
It equally flows, one of special case is exactly cholesteric liquid crystal, in this phase, is directed toward sagittal axis and constantly distorts, lead to molecule shape
At helical structure.When nematic material or mixture are partly or entirely by the molecular composition with chiral centres, it may appear that this
Kind phase.This phase has can be based on the specific properties of the light of complete helix distance (i.e. screw pitch) reflection specific band.?
In many liquid crystal material of cholesteric phase, outside stimulus (such as temperature, chemical substance, strain) can change screw pitch, and then change anti-
Penetrate the wavelength of light.It is rung accordingly it is contemplated that liquid crystal material of cholesteric phase is applied to thermometer, mood ring, intelligent infrared reflector, water
Answer multicolour pattern, sensor, imaging and anti-counterfeit measures etc..But existing cholesteric liquid crystal system reflection wavelength cannot be conditioned,
Flexibility is poor.
Summary of the invention
In order to solve the above technical problem, the present invention provides a kind of cholesteric liquid crystal composite membrane and preparation method thereof and answer
With；Cholesteric liquid crystal system has temperature response characteristics in the cholesteric liquid crystal composite membrane, can be by controlling temperature flexible modulation
Determine reflection wavelength；And the screw pitch of cholesteric crystal layer in composite membrane can be changed by elongation strain, and then change its back wave
It is long.
The technical scheme adopted by the invention is that: a kind of cholesteric liquid crystal composite membrane, including the cholesteric phase liquid being stacked
Crystal layer and elastomer layer；Wherein, the raw material of the cholesteric crystal layer includes achiral liquid crystal diacrylate, chiral liquid crystal two
Acrylate, chain extender and photoinitiator；The raw material of the elastomer layer includes elastomer presoma and crosslinking agent.
Preferably, the raw material of the cholesteric crystal layer include 75~85wt% achiral liquid crystal diacrylate, 5~
15wt% chiral liquid crystal monomer, 6~12wt% chain extender and 0.5~3wt% photoinitiator.
Preferably, the chain extender includes but is not limited at least one of butylamine, decyl amine, lauryl amine, glycine.
Preferably, the photoinitiator include but is not limited to Irgacure184, Irgacure-819, Irgacure-651,
At least one of Irgacure-369.
Preferably, the elastomer presoma include but is not limited to dimethyl silicone polymer, natural rubber, butadiene-styrene rubber,
At least one of butadiene rubber, isoprene rubber and polyurethane rubber.
Preferably, the cholesteric crystal layer is patterned cholesteric crystal layer；The elastomer layer is transparent elastic
Body layer.
The present invention also provides the preparation methods of more than one cholesteric liquid crystal composite membranes, comprising the following steps:
S1: preparation cholesteric crystal layer, comprising: the raw material for taking cholesteric crystal layer heats polymerization after mixing, then will polymerization
Material, which is coated on substrate, afterwards forms mixed liquid crystal coating；It reuses mixed liquid crystal coating described in ultraviolet light and brings it about friendship
Connection reaction；Preferably 25 DEG C~150 DEG C of heating temperature of the heating polymerization.
S2: elastomer layer is prepared, comprising: it is coated on the cholesteric liquid crystal after mixing by the raw material for taking elastomer layer
The surface of layer, is heating and curing.
Preferably, in step sl, using mixed liquid crystal coating described in ultraviolet light, the ultraviolet light light source with
Mask plate is set between the mixed liquid crystal coating, and the mask plate includes light transmission part and lightproof part, the ultraviolet light
It is irradiated on the mixed liquid crystal coating by the light transmission part, so that the corresponding mixed liquid crystal coating hair in the light transmission part
Raw cross-linking reaction, so that the patterning of cholesteric crystal layer can be realized.
Preferably, in step sl, mixed liquid crystal described in ultraviolet light is used at different temperatures by the mask plate
The different zones of coating, so that the mixed liquid crystal coating of the different zones crosslinks curing reaction at different temperatures.From
And the reflection wavelength in patterning each region of cholesteric crystal layer further can be flexibly controlled by regulating and controlling temperature according to demand.
Cholesteric liquid crystal system has temperature response characteristics in the above cholesteric liquid crystal composite membrane, can pass through control temperature spirit
Living adjust determines reflection wavelength；And the screw pitch of cholesteric crystal layer in composite membrane can be changed by elongation strain to change its reflection
Wavelength (i.e. the position of back wave), so as to be applied to production strain transducer, antifalsification label or data encryption.Specifically
Ground, when strain changes, reflection wavelength changes, by monitoring reflection wavelength can real-time monitoring strain variation,
So as to as strain transducer.Since the color of cholesteric liquid crystal can be considered as structural color, it is generally difficult to replicate, work as cholesteric
When elongation strain occurs for phase liquid crystal layer, reflection wavelength changes, and can be presented by the change of color, therefore can be drawn by observation
See whether color changes to tell truth from falsehood when stretching；In addition, can be by carrying out patterning schemes to cholesteric crystal layer, by gallbladder
Steroid phase liquid-crystal composite membrane be designed as be in an unstretched state pattern-free pellucidity, certain pattern is presented in when stretching, therefore
Data can be recorded in this way, not shown when non-stretched, when stretching shows, to reach the mesh of data encryption
's.
In addition, the present invention also provides a kind of strain transducer, including any of the above cholesteric liquid crystal composite membrane.By this
Strain transducer, when strain changes, the position of back wave can change, by the position for monitoring back wave
The variation of real-time monitoring strain.
The method have the benefit that: the present invention provides a kind of cholesteric liquid crystal composite membrane and preparation method thereof and answers
With the cholesteric liquid crystal composite membrane includes the cholesteric crystal layer being stacked and elastomer layer, wherein cholesteric crystal layer
Raw material includes achiral liquid crystal diacrylate, chiral liquid crystal diacrylate, chain extender and photoinitiator；The original of elastomer layer
Material includes elastomer presoma and crosslinking agent.Wherein, by using two propylene of achiral liquid crystal in the raw material of cholesteric crystal layer
Backbone polymerization reaction occurs for acid esters, chiral liquid crystal diacrylate and chain extender, so that cholesteric liquid crystal system is rung with temperature
Characteristic is answered, can be determined instead by being crosslinked at a temperature of control come flexible modulation according to specific requirements when preparing cholesteric crystal layer
Ejected wave is long, and the preparation of its cholesteric crystal layer is made to have diversification；In addition, since elastomer layer has stronger stretch-proof strong
It is cooperated with cholesteric crystal layer, can enhance the tensile strength of cholesteric liquid crystal composite membrane, stability is strong, can pass through drawing by degree
Stretching strain changes the screw pitch of cholesteric crystal layer in composite membrane to change its reflection wavelength, which can also pass through the change of color
It presents, so as to which the cholesteric liquid crystal composite membrane is applied to prepare strain transducer, antifalsification label or data encryption etc., so that
In no orientation for sacrificing liquid crystal coatings, the thickness of controlled strain sensor becomes simple.
Detailed description of the invention
For the clearer technical solution illustrated in the embodiment of the present invention, will make below to required in embodiment description
Attached drawing briefly describes.
Fig. 1 is the preparation flow schematic diagram of one embodiment of cholesteric liquid crystal composite membrane of the present invention；
Fig. 2 is blue shift schematic diagram of the reflection wavelength of cholesteric liquid crystal composite membrane in Fig. 1 under the action of elongation strain.
Fig. 3 is that the preparation flow of patterning cholesteric crystal layer in another embodiment of cholesteric liquid crystal composite membrane of the present invention shows
It is intended to.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Range.
Embodiment 1
Referring to Fig. 1, Fig. 1 is the preparation flow schematic diagram of one embodiment of cholesteric liquid crystal composite membrane of the present invention；Wherein, it flows
Journey A is the preparation flow schematic diagram of cholesteric crystal layer in the present embodiment；Process B is the preparation stream of the present embodiment elastomer layer
Journey schematic diagram.
As shown in fig. 1, cholesteric crystal layer is prepared by wherein process A.Specifically, take the following raw material: 79.73t% is non-
Chiral liquid crystal diacrylate monomer, 10.50wt% chiral liquid crystal diacrylate monomer and 8.78wt% chain extender butylamine and
The above raw material is uniformly mixed and forms mixture by 0.99wt% photoinitiator Irgacure184, then heats and stirs for 100 DEG C
The mixture brings it about polymerization reaction and forms oligomer；Material after polymerization is coated in dried and clean using the mode of blade coating
On glass substrate, about 10 μm of thickness, mixed liquid crystal coating is formed；Using ultraviolet light mixed liquid crystal coating, friendship is brought it about
Join curing reaction, forms cholesteric crystal layer.
By elastomer layer shown in process B, being prepared in cholesteric crystal layer to form cholesteric liquid crystal composite membrane.Specifically
Ground, takes the presoma and crosslinking agent of dimethyl silicone polymer (PDMS) in mass ratio for 9:1, and the two is spun on after mixing
The upper surface of cholesteric crystal layer produced above, and be placed in 80 DEG C of thermal station, make its solidification, forms elastomer layer.Then
Cholesteric liquid crystal/PDMS duplicature is removed from glass substrate with blade, obtains cholesteric liquid crystal composite membrane.
The structural formula of achiral liquid crystal diacrylate monomer used by above is as follows:
In the process A of Fig. 1,It is write a Chinese character in simplified form for achiral liquid crystal diacrylate monomer, wherein R1
It indicates:
The structural formula of chiral liquid crystal diacrylate monomer is as follows:
In the process A of Fig. 1,For writing a Chinese character in simplified form for chiral liquid crystal diacrylate monomer；Wherein, R2
It indicates:
The structural formula of chain extender butylamine is as follows:In the process A of Fig. 1, R3-NH2For the letter of chain extender butylamine
It writes, wherein R3It indicates:
The structural formula of photoinitiator Irgacure184 is as follows:
It carries out back wave blue shift under the action of elongation strain to the above obtained cholesteric liquid crystal composite membrane to test, specifically
Can be fixedly clamped respectively two opposite side of cholesteric liquid crystal composite membrane with two fixtures, then two fixtures are separately fixed at vernier caliper
Exterior measuring measuring jaw on, first measuring composite membrane in tiling, the size under unstretched state is l0=30mm then slowly slides vernier
Cholesteric liquid crystal composite membrane is stretched, is Δ l in tensile elongation1=0.87mm, Δ l2=1.67mm and Δ l3When=4.33mm, point
Its transmitted spectrum is not measured, obtains back wave with the variation of tensile elongation, as a result as shown in Figure 2, wherein dependent variable=Δ ln/l0
As shown in Figure 2, when being uniaxially stretched, back wave is mobile towards the direction of low band, when dependent variable is 14.4%, instead
Ejected wave has the movement (being moved to 595nm from 680nm) of 85nm.The movement of the back wave is since cholesteric liquid crystal is when stretching
Thickness reduction causes screw pitch to reduce, mobile to low reflected waveband so as to cause reflection wavelength.Therefore, which is used as answering
Become sensor and carrys out real-time monitoring Uniaxial Deformation.
Embodiment 2
The preparation method of the preparation method and embodiment 1 of the present embodiment cholesteric liquid crystal composite membrane is essentially identical, the two
Difference place is: the present embodiment is when preparing cholesteric crystal layer, by way of carrying out multistep crosslinking at different temperatures
To realize the patterning of cholesteric crystal layer.Fig. 3 specifically is referred to, Fig. 3 is another implementation of cholesteric liquid crystal composite membrane of the present invention
The preparation flow schematic diagram of cholesteric crystal layer is patterned in example.As shown in figure 3, when preparing cholesteric crystal layer, by covering
Diaphragm plate 1 is in temperature T1Lower to use ultraviolet light mixed liquid crystal coating 2, mask plate 1 includes light transmission part 11 and lightproof part
12, light transmission part 11 is half star in mask plate employed in the present embodiment；Mask plate 1 be set to ultraviolet light light source with mix
Between liquid crystal coatings 2, ultraviolet light is irradiated on mixed liquid crystal coating 2 by light transmission part 11, so that light transmission part 11 is corresponding
Mixed liquid crystal coating crosslinks reaction, and mixed liquid crystal coating corresponding to lightproof part 12 does not crosslink reaction；It adjusts
Whole mask plate 1 makes the light transmission part of mask plate 1 and the light transmission part before adjustment after adjusting constitute complete star, in another temperature T2
Lower to use ultraviolet light mixed liquid crystal coating 2, mixture coating 2 corresponding to light transmission part 11 crosslinks curing reaction；
Mask plate 1 is removed again, in temperature T3It is lower to utilize ultraviolet light mixed liquid crystal coating 2, so that on mixed liquid crystal coating 2 before this not
The region for crosslinking reaction crosslinks reaction, and the region that cross-linking and curing reaction had occurred before this is unaffected, thus
Star-patterned cholesteric crystal layer is formed, there are three reflection wavelength not same areas, including background area 31, temperature T for tool1
Under the mulle region 32 that is cross-linked to form and temperature T2Under the mulle region 33 that is cross-linked to form.Other steps and embodiment
1 is identical.
The cholesteric phase composite membrane back wave as made from method made above is near infrared range, cholesteric phase composite membrane gallbladder
Pattern on steroid phase liquid crystal layer is sightless.When stretched, the reflected waveband of star region will move to the range of visible light, become
At visible, mulle is showed, and background is transparent；When further stretch, the reflected waveband of peripheral region is also moved
To visible-range, the color change of mulle and background area.
It certainly, can also be by temperature when similar mode and adjustment ultraviolet light, to prepare tool in other embodiments
Figuratum flexible double film, wherein pattern in initial unstretched state be it is hiding, when stretching, is visible.This kind of mode, works as adjusting
Pattern back wave stretches duplicature, it is ultraviolet to may make that the back wave of pattern is moved to when close to the visible-range of ultraviolet light
Wave band becomes invisible, further stretches, and background also becomes invisible, and in this case, pattern is in initial unstretched state
For as it can be seen that being hiding under tensional state.In addition, can also choose the mask plate with specific pattern, Huo Zhegen according to patterning requirement
Crosslinking temperature is adjusted flexibly according to the requirement to each region reflection wavelength.
Cholesteric crystal layer in composite membrane can be changed by elongation strain by having figuratum cholesteric liquid crystal composite membrane above
Screw pitch change its reflection wavelength, the application such as strain transducer, antifalsification label, camouflage and data encryption it is upper have it is very big latent
Power.
Embodiment 3
The preparation method of the preparation method and embodiment 1 of the present embodiment cholesteric liquid crystal composite membrane is essentially identical, the two
Difference place is: the raw material of cholesteric crystal layer includes: 75wt% achiral liquid crystal diacrylate monomer, 15wt% chirality
Liquid crystal diacrylate monomer and 8wt% chain extender glycine and 2wt% photoinitiator Irgacure-819, other preparation process
It is same as Example 1.
The structural formula of achiral liquid crystal diacrylate monomer employed in the present embodiment is as follows:
The structural formula of chiral liquid crystal diacrylate monomer is as follows:
The structural formula of chain extender glycine is as follows:
The structural formula of photoinitiator Irgacure-819 is as follows:
Embodiment 4
The preparation method of the preparation method and embodiment 1 of the present embodiment cholesteric liquid crystal composite membrane is essentially identical, the two
Difference place is: the raw material of cholesteric crystal layer includes: 85wt% achiral liquid crystal diacrylate monomer, 6wt% chirality
Liquid crystal diacrylate monomer and 6wt% chain extender decyl amine and 3wt% photoinitiator Irgacure-651, other preparation process with
Embodiment 1 is identical.；
The structural formula of achiral liquid crystal diacrylate monomer employed in the present embodiment is as follows:
The structural formula of chiral liquid crystal diacrylate monomer is as follows:
The structural formula of chain extender decyl amine is as follows:
The structural formula of photoinitiator Irgacure-651 is as follows:
Embodiment 5
The preparation method of the preparation method and embodiment 1 of the present embodiment cholesteric liquid crystal composite membrane is essentially identical, the two
Difference place is: the raw material of cholesteric crystal layer includes: 82.5wt% achiral liquid crystal diacrylate monomer, 5wt% hand
Property liquid crystal diacrylate monomer and 12wt% chain extender lauryl amine and 0.5wt% photoinitiator Irgacure-369, other systems
Standby process is same as Example 1.
The structural formula of achiral liquid crystal diacrylate monomer employed in the present embodiment is as follows:
The structural formula of chiral liquid crystal diacrylate monomer is as follows:
The structural formula of chain extender lauryl amine is as follows:
The structural formula of photoinitiator Irgacure-369 is as follows:
Although specifically showing and describing the present invention in conjunction with preferred embodiment, those skilled in the art should be bright
It is white, it is not departing from the spirit and scope of the present invention defined by described claims, it in the form and details can be right
The present invention makes a variety of changes, and is protection scope of the present invention.
Claims (10)
1. a kind of cholesteric liquid crystal composite membrane, which is characterized in that including the cholesteric crystal layer being stacked and elastomer layer；Its
In, the raw material of the cholesteric crystal layer include achiral liquid crystal diacrylate, chiral liquid crystal diacrylate, chain extender and
Photoinitiator；The raw material of the elastomer layer includes elastomer presoma and crosslinking agent.
2. cholesteric liquid crystal composite membrane according to claim 1, which is characterized in that the raw material packet of the cholesteric crystal layer
Include 75~85wt% achiral liquid crystal diacrylate, 5~15wt% chiral liquid crystal monomer, 6~12wt% chain extender and 0.5~
3wt% photoinitiator.
3. cholesteric liquid crystal composite membrane according to claim 1, which is characterized in that the chain extender include butylamine, decyl amine,
At least one of lauryl amine, glycine.
4. cholesteric liquid crystal composite membrane according to claim 1, which is characterized in that the elastomer presoma includes poly- two
At least one of methylsiloxane, natural rubber, butadiene-styrene rubber, butadiene rubber, isoprene rubber and polyurethane rubber.
5. cholesteric liquid crystal composite membrane described in any one of -4 according to claim 1, which is characterized in that the cholesteric liquid crystal
Layer is patterned cholesteric crystal layer；The elastomer layer is transparent elastomer layer.
6. the preparation method of cholesteric liquid crystal composite membrane described in any one of claim 1-5, which is characterized in that including following step
It is rapid:
S1: preparation cholesteric crystal layer, comprising: the raw material for taking cholesteric crystal layer, after mixing heat polymerization, then will polymerization after object
Material, which is coated on substrate, forms mixed liquid crystal coating；It reuses mixed liquid crystal coating described in ultraviolet light and brings it about crosslinking instead
It answers；
S2: elastomer layer is prepared, comprising: it is coated on the cholesteric crystal layer after mixing by the raw material for taking elastomer layer
Surface is heating and curing.
7. the preparation method of cholesteric liquid crystal composite membrane according to claim 6, which is characterized in that in step sl, make
Exposure mask is arranged between the light source and the mixed liquid crystal coating of the ultraviolet light in the mixed liquid crystal coating described in ultraviolet light
Plate, the mask plate include light transmission part and lightproof part, and the ultraviolet light is irradiated to described mixed by the light transmission part
It closes in liquid crystal coatings, so that the corresponding mixed liquid crystal coating in the light transmission part crosslinks curing reaction.
8. the preparation method of cholesteric liquid crystal composite membrane according to claim 7, which is characterized in that in step sl, borrow
The mask plate is helped to use the different zones of mixed liquid crystal coating described in ultraviolet light at different temperatures, so that the not same district
The mixed liquid crystal coating in domain crosslinks curing reaction at different temperatures.
9. cholesteric liquid crystal composite membrane described in claim 1-5 is in production strain transducer, antifalsification label or data encryption
Application.
10. a kind of strain transducer, which is characterized in that compound including cholesteric liquid crystal of any of claims 1-5
Film.
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| CN113376914A (en) * | 2021-05-31 | 2021-09-10 | 西南医科大学 | Stretchable microcapsule film for reflective display and preparation method thereof |
| CN113534509A (en) * | 2021-06-28 | 2021-10-22 | 华南师范大学 | Light reflection coating, preparation method thereof and optical device |
| CN113684612A (en) * | 2021-07-23 | 2021-11-23 | 佛山科学技术学院 | Liquid crystal state composite fiber membrane and preparation and application thereof |
| 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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