CN101430449B - Polymer dispersion liquid crystal piezo-optical effect film and manufacturing method and use thereof - Google Patents
Polymer dispersion liquid crystal piezo-optical effect film and manufacturing method and use thereof Download PDFInfo
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- CN101430449B CN101430449B CN2008101541771A CN200810154177A CN101430449B CN 101430449 B CN101430449 B CN 101430449B CN 2008101541771 A CN2008101541771 A CN 2008101541771A CN 200810154177 A CN200810154177 A CN 200810154177A CN 101430449 B CN101430449 B CN 101430449B
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Abstract
The invention relates to a polymer dispersed liquid crystal calendering effect film which comprises two flexible and transparent conductive films, and a polymer dispersed liquid crystal layer; the polymer dispersed liquid crystal layer is clamped between the two flexible and transparent conductive films; the two conductive films are etched with electrodes; the polymer dispersed liquid crystal layer is manufactured by a prepolymer consisting of a polymerizable monomer, a chain transfer agent and a light trigger, a nematic liquid crystal material and a pad material according to the weight proportion of 1: 1-3 between the prepolymer and the nematic liquid crystal. An elastomer film prepared by the invention not only can lead the film to have the function of dispersion or light transmission by applying an electric field, but also can lead the film to have the performance of dispersion or light transmission by applying a pressure, thereby obtaining a more specific aiming function film; and the polymer dispersed liquid crystal calendering effect film can be specifically applied in the fields such as optical pressure sensors, pressure contact light valves and intelligent touch windows.
Description
Technical field
The present invention relates to a kind of polymer dispersion liquid crystal piezo-optical effect film, preparing elastomer film realizes and can make film that scattering or light transmission be arranged by applying electric field, also can make film that scattering or light transmission are arranged by exerting pressure, and then the more peculiar dimming function film of acquisition, can be at fibre optic compression sensor, fields such as pressure contact light valve and intelligence touch window obtain special application.
Background technology
Polymer Dispersed Liquid Crystal (Polymer Dispersed Liquid Crystal, be called for short PDLC) be that polymkeric substance and nematic phase (nematic) liquid crystal and wadding are mixed with certain ratio, be clipped between two flexible transparent conductive films, through being separated, liquid crystal is separated out the formation droplet from polymkeric substance, polymer cure is wrapped in wherein a kind of composite membrane to liquid crystal droplet.During added electric field, because the refractive index and the liquid crystal material refractive index of polymkeric substance do not match, do not cause light scattering, composite membrane is to OFF state only; After applying electric field, refractive index polymer and liquid crystal material refractive index are complementary, and cause transmittance, and composite membrane is to ON state only.Pdlc film is the high-tech product of the invention eighties in 20th century, at dimming glass, and large screen display, many fields such as holographic grating have using value, also still are the problem that the liquid crystal device researcher pays close attention to now.
Piezoelectric effect is well-known physical phenomenon practical technique, and a class scales of developing according to the dielectric piezoelectric effect is a piezoelectric sensor.Fibre Optical Sensor is the widely used advanced technology of Modern Transducer Technology.Cholesteric liquid crystal pitch under pressure can change and causes the Bragg reflection optical change color, and people are referred to as piezooptical effect.Pdlc film also has stretching or shear stress to cause the applied research report of printing opacity effect aspect, but does not also have pressure to cause the printing opacity effect, be i.e. the report of piezooptical effect except that having peculiar electro-optical characteristic.The present invention is based on the understanding that PDLC is had the up-to-date experimental phenomena of current research of piezooptical effect, the light leakage phenomenon under PDLC and the pressure effect combines, for designing new product provides scheme.
Summary of the invention
The object of the present invention is to provide a kind of polymer dispersion liquid crystal piezo-optical effect film, adopt the high resiliency polymkeric substance, rely on pressure to change with simple design proposal and realize PDLC scattering and printing opacity two states, and then obtain new departure of a kind of PDLC, can obtain special application in fields such as construction and decoration and jewelry sales counters, become the new technology of functional glass, new varieties, the new application provides reference for designing new functional glass principle of work.Particularly can be applied to fibre optic compression sensor, pressure contact light valve and intelligence touch the application manufacturing of window.
A kind of polymer dispersion liquid crystal piezo-optical effect film provided by the invention comprises two flexible transparent conductive films, and one layer of polymeric dispersing liquid crystal layer, polymer dispersed liquid crystal layer are clipped between two flexible transparent conductive films, are etched with electrode on two conductive films; Polymer dispersed liquid crystal layer is to be made by prepolymer, nematic liquid crystal material and gasket material.Concrete preparation process is: be transferred between two flexible transparent conducting films after at normal temperatures prepolymer, nematic liquid crystal material and gasket material being mixed, be squeezed into composite membrane, UV-irradiation, liquid crystal is separated out from polymkeric substance, form liquid crystal droplet, two flexible transparent conducting films process contact conductor, and apply DC electric field between electrode, and the vertical surface direction of polymer dispersion liquid crystal piezo-optical effect film is exerted pressure.
The mass ratio of prepolymer and nematic liquid crystal is 1: 1-3, prepolymer comprise polymerisable monomer, chain-transferring agent and light trigger.Described gasket material microsphere diameter size 6-30 μ m, content is 10-30/mm in polymer dispersed liquid crystal layer
2
The refractive index of polymkeric substance is n in the described polymer dispersed liquid crystal layer
p, the liquid crystal material ordinary refraction index is n
o, liquid crystal very optical index is n
eClosing between three refractive indexes is n
p=(n
o+ n
e)/2, n
pValue 1.5-1.65, n
oValue 1.45-1.55, n
eValue 1.55-1.75.
The quality of described prepolymer raw material is formed: polymerisable monomer propoxyl group nonyl phenyl acrylate 15-25%, and trimethylolpropane triacrylate 65-75%, chain-transferring agent decanedioic acid 3-5%, light trigger 1173 is 3-5%.
Described transparent film can be a transparent conductive film, also can be common nonconducting transparent film.
Described polymer dispersion liquid crystal piezo-optical effect film, when applying voltage, liquid crystal molecule points to direction of an electric field in the liquid crystal droplet, and liquid crystal droplet is rendered as the anisotropy uniaxial crystal, and pdlc film is in transparent ON state.Removing liquid crystal molecule director distribution at random in the electric field liquid crystal droplet, promptly is not anisotropic uniaxial crystal, neither isotropic transparency liquid, but troubled liquor, pdlc film is in the scattering OFF state.
Described polymer dispersion liquid crystal piezo-optical effect film, when the vertical surface direction is exerted pressure, liquid crystal molecule will be arranged along film surface in the liquid crystal droplet, and liquid crystal droplet is rendered as the anisotropy uniaxial crystal again, and pdlc film also can be in transparent ON state.
The manufacture method of polymer dispersion liquid crystal piezo-optical effect film is suitable for the PDLC manufacturing technology, is to adopt the ultraviolet light polymerization phase detachment technique.
The step that the manufacture method of polymer dispersion liquid crystal piezo-optical effect film provided by the invention comprises:
1) by metering polymerisable monomer, chain-transferring agent and the light trigger of prepolymer stirred with nematic liquid crystal material and wadding at normal temperatures and mix;
2) prepolymer that mixes and nematic liquid crystal and wadding are transferred between two flexible transparent conducting films;
3) with the pressing machine two flexible transparent conducting films that printed prepolymer and liquid crystal compound are squeezed into composite membrane;
4) composite membrane was separated in UV-irradiation 1-3 minute with medium tenacity (about 25mW), liquid crystal is fully separated out from polymkeric substance, form the liquid crystal droplet of about 2-4 micron diameter size.
5) two flexible transparent conducting films are processed contact conductor, between electrode, apply DC electric field (as 25 volts), make composite membrane (polymer dispersion liquid crystal piezo-optical effect film) present transparent ON state;
6) remove electric field, polymer dispersion liquid crystal piezo-optical effect film presents the scattering OFF state;
7) polymer dispersion liquid crystal piezo-optical effect film is exerted pressure about 10 in the vertical surface direction
5Pa, liquid crystal molecule will be arranged along film surface in the liquid crystal droplet, and liquid crystal droplet is rendered as the anisotropy uniaxial crystal again, and polymer dispersed liquid crystal film is in transparent ON state.
Polymer dispersion liquid crystal piezo-optical effect film provided by the invention can be applied to fibre optic compression sensor, and pressure contact light valve and intelligence touch the application manufacturing of window.
Compared with the prior art the present invention has following advantage:
Existing PDLC technology obtains increasing the application as dimming glass in top-grade building finishing field, and in large screen display, holographic grating, there is application prospect in fields such as Electronic Paper.Existing pdlc film is harder owing to polymkeric substance, firmly pushes transparent light leakage phenomena also not occur, and remains on scattering state.Because it is usually more flexible that the present invention does polymkeric substance as rubber, observe significantly under the pressure effect and become the light-transmissive film phenomenon, so be the multifunctional membrane material that has obtained having concurrently electrooptical effect and piezooptical effect from scattering film.So the present invention is the PDLC new solution, can be new products such as the touch window of PDLC dimming glass or contact light valve; Can combine with optical fiber technology, make the liquid-core optical fibre pressure transducer; Perhaps make low-refraction PDLC, as fibre sheath design novel optical fiber pressure transducer.The present invention also provides imagination space for other application.
Description of drawings:
Fig. 1 is a polymer dispersion liquid crystal piezo-optical effect film structural representation of the present invention.
Fig. 2 is a polymer dispersion liquid crystal piezo-optical effect film principle of work synoptic diagram of the present invention.
Fig. 3 is a polymer dispersion liquid crystal piezo-optical effect film manufacture method synoptic diagram of the present invention.
Embodiment:
The invention will be further described below in conjunction with drawings and Examples.Polymer dispersion liquid crystal piezo-optical effect film is produced in the ultrapurification workshop, and production equipment mainly comprises ultrapure washed with de-ionized water machine, prepolymer and liquid crystal mixing and blending machine, prepolymer coating machine, pressing machine, platform sealing ultra-violet curing machine, microtome etc.
The prepolymer polymerization single polymerization monomer that the present invention uses is a propoxyl group nonyl phenyl acrylate (20%), trimethylolpropane triacrylate (70%), chain-transferring agent (5%), light trigger 1173 (C
10H
12O
2, 2-hydroxy-2-methyl-1-propiophenone) and (5%).The propoxyl group nonyl phenyl acrylate that the present invention uses is the special special surface of a U.S.'s cyanogen technology company product.The trimethylolpropane triacrylate that the present invention uses is a Tianjin proud son of heaven chemical products.The chain-transferring agent decanedioic acid that the present invention uses is produced by the chemical plant, Quzhou.The light trigger 1173 that the present invention uses is Beijing Ying Li scientific ﹠ technical corporation products.Described liquid crystal material is the ester liquid crystal series of products HLC005 of Hebei Luquan novel electron material factory, and the liquid crystal ordinary refraction index is about n
o=1.5, liquid crystal very optical index is n
e=1.7.Described transparent film film can be a conducting film, also can be non-conductive transparent film, is Hunan three ability company transparent ITO conducting film products.Described prepolymer and nematic liquid crystal are pressed mass ratio: 1: 1-3; Described wadding diameter is about 10 microns plastic microspheres, can be that the product of little scientific ﹠ technical corporation is received in Shenzhen, and plastic microsphere content is 10-30/mm
2
Referring to Fig. 1, polymer dispersion liquid crystal piezo-optical effect film structural representation of the present invention.Electrically conducting transparent thin layer electrode 102,104 is arranged, sandwich polymer dispersed liquid crystal layer 103 above the flexible and transparent film 101,105.Polymer dispersed liquid crystal layer 103 thickness 10 μ m, the about 2-4 μ of liquid crystal droplet 106 mean diameters m, refractive index polymer select to be about
nP=1.6, the about n of liquid crystal ordinary refraction index
o=1.5, unusual optical index n
e=1.7.
Referring to Fig. 2, between electrode, apply about 25 volts of electric fields, make liquid crystal molecule turn to direction of an electric field, film presents transparent ON state 201.Remove electric field, polymer dispersion liquid crystal piezo-optical effect film presents scattering OFF state 202.When vertical plane is exerted pressure, the liquid crystal droplet distortion, liquid crystal molecule is arranged along face, liquid-crystal refractive-index is got face mean refractive index＜n 〉=1.6, np is complementary with refractive index polymer, presents printing opacity ON state effect 203.Remove pressure and return to scattering state 202.
Referring to Fig. 3, polymer dispersion liquid crystal piezo-optical effect film manufacture method synoptic diagram of the present invention.
A, at normal temperatures, prepolymer (propoxyl group nonyl phenyl acrylate (20%), trimethylolpropane triacrylate (70%), chain-transferring agent (5%), light trigger 1173 (5%)) stir with liquid crystal material and an amount of 10 microns wadding and mix, prepolymer and nematic liquid crystal are in 1: the 1-3 ratio is mixed.
B, two flexible transparent conducting film inboards, outside etch electrode 102,104;
C, the prepolymer that mixes and nematic liquid crystal and wadding print-on coating to 301 are had between two flexible transparent conducting films 302,303 of coplanar electrodes;
D, two flexible transparent conducting films that have been coated with prepolymer and liquid crystal compound are squeezed into composite membrane 304 with the pressing machine;
E, composite membrane is separated, liquid crystal is fully separated out from polymkeric substance, when forming the liquid crystal droplet of the about 2-4 micron of mean diameter, be cured (being separated and solidifying processing is UV-curing technology).
Claims (5)
1. polymer dispersion liquid crystal piezo-optical effect film, it comprises two flexible transparent conductive films, one layer of polymeric dispersing liquid crystal layer, polymer dispersed liquid crystal layer are clipped between two flexible transparent conductive films, are etched with electrode on two conductive films; Polymer dispersed liquid crystal layer is the prepolymer of forming with polymerisable monomer and light trigger, nematic liquid crystal material and gasket material are raw material, mass ratio according to prepolymer and nematic liquid crystal is 1: the ratio of 1-3 is made, preparation process is: under the normal temperature with prepolymer, nematic liquid crystal material and gasket material are transferred between two flexible transparent conducting films after mixing, be squeezed into composite membrane, UV-irradiation, liquid crystal is separated out from polymkeric substance, form liquid crystal droplet, two flexible transparent conducting films process contact conductor, and between electrode, apply DC electric field, the vertical surface direction of polymer dispersion liquid crystal piezo-optical effect film is exerted pressure; It is characterized in that:
Described polymer dispersed liquid crystal layer form the raw material of prepolymer contain chain-transferring agent;
Described polymer dispersion liquid crystal piezo-optical effect film, when the vertical surface direction is exerted pressure, liquid crystal molecule will be arranged along film surface in the liquid crystal droplet, and liquid crystal droplet is rendered as the anisotropy uniaxial crystal again;
The quality of described prepolymer raw material is formed: propoxyl group nonyl phenyl acrylate 15-25%, trimethylolpropane triacrylate 65-75%, chain-transferring agent decanedioic acid 3-5%, light trigger 1173 3-5%;
The refractive index of polymkeric substance is n in the described polymer dispersed liquid crystal layer
p, the liquid crystal material ordinary refraction index is n
o, liquid crystal very optical index is n
eClosing between three refractive indexes is n
p=(n
o+ n
e)/2, n
pValue 1.5-1.65, n
oValue 1.45-1.55, n
eValue 1.55-1.75.
2. polymer dispersion liquid crystal piezo-optical effect film according to claim 1 is characterized in that described gasket material is the microballoon of diameter dimension 6-30 μ m, and content is 10-30/mm in polymer dispersed liquid crystal layer
2
3. polymer dispersion liquid crystal piezo-optical effect film according to claim 1, it is characterized in that described polymer dispersion liquid crystal piezo-optical effect film, when applying voltage, liquid crystal molecule points to direction of an electric field in the liquid crystal droplet, and liquid crystal droplet is rendered as the anisotropy uniaxial crystal; Remove liquid crystal molecule director distribution at random in the electric field liquid crystal droplet.
4. the manufacture method of the described polymer dispersion liquid crystal piezo-optical effect film of claim 1 is characterized in that the step that comprises:
1) by metering polymerisable monomer, chain-transferring agent and the light trigger of prepolymer stirred with nematic liquid crystal material and wadding at normal temperatures and mix;
2) prepolymer that mixes and nematic liquid crystal and wadding are transferred between two flexible transparent conducting films;
3) with the pressing machine two flexible transparent conducting films that printed prepolymer and liquid crystal compound are squeezed into composite membrane;
4) composite membrane was separated in 1-3 minute with the 25mW UV-irradiation, liquid crystal is fully separated out from polymkeric substance, form the liquid crystal droplet of 2-4 micron diameter size;
5) two flexible transparent conducting films are processed contact conductor, between electrode, apply 25 volts of DC electric field, make composite membrane present transparent ON state;
6) remove electric field, polymer dispersion liquid crystal piezo-optical effect film presents the scattering OFF state;
7) polymer dispersion liquid crystal piezo-optical effect film is exerted pressure 10 in the vertical surface direction
5Pa, liquid crystal molecule will be arranged along film surface in the liquid crystal droplet, and liquid crystal droplet is rendered as the anisotropy uniaxial crystal again, and polymer dispersed liquid crystal film is in transparent ON state.
5. the application of the described polymer dispersion liquid crystal piezo-optical effect film of claim 1 is characterized in that being used for fibre optic compression sensor, and pressure contact light valve and intelligence touch the manufacturing of window.
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