CN113534316B - Optical film, preparation method thereof and photoelectric device - Google Patents
Optical film, preparation method thereof and photoelectric device Download PDFInfo
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- CN113534316B CN113534316B CN202010294097.7A CN202010294097A CN113534316B CN 113534316 B CN113534316 B CN 113534316B CN 202010294097 A CN202010294097 A CN 202010294097A CN 113534316 B CN113534316 B CN 113534316B
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- 239000012788 optical film Substances 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000010408 film Substances 0.000 claims abstract description 88
- 239000004814 polyurethane Substances 0.000 claims abstract description 42
- 229920002635 polyurethane Polymers 0.000 claims abstract description 42
- 230000010287 polarization Effects 0.000 claims abstract description 28
- 230000003287 optical effect Effects 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 13
- 150000005846 sugar alcohols Polymers 0.000 claims abstract description 13
- 230000005693 optoelectronics Effects 0.000 claims abstract description 11
- 230000002829 reductive effect Effects 0.000 claims abstract description 9
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 15
- 239000004626 polylactic acid Substances 0.000 claims description 15
- 238000000465 moulding Methods 0.000 claims description 9
- 238000002834 transmittance Methods 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 5
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 229920000515 polycarbonate Polymers 0.000 claims description 2
- 239000004417 polycarbonate Substances 0.000 claims description 2
- 229920005862 polyol Polymers 0.000 description 29
- 150000003077 polyols Chemical class 0.000 description 25
- 239000000463 material Substances 0.000 description 12
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 7
- UOCLXMDMGBRAIB-UHFFFAOYSA-N 1,1,1-trichloroethane Chemical compound CC(Cl)(Cl)Cl UOCLXMDMGBRAIB-UHFFFAOYSA-N 0.000 description 6
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 5
- 229920000909 polytetrahydrofuran Polymers 0.000 description 5
- 239000004970 Chain extender Substances 0.000 description 4
- -1 binaphthyl polyol Chemical class 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000012948 isocyanate Substances 0.000 description 4
- 150000002513 isocyanates Chemical class 0.000 description 4
- 230000000737 periodic effect Effects 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 238000003745 diagnosis Methods 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- QPFMBZIOSGYJDE-UHFFFAOYSA-N 1,1,2,2-tetrachloroethane Chemical compound ClC(Cl)C(Cl)Cl QPFMBZIOSGYJDE-UHFFFAOYSA-N 0.000 description 2
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
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- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 230000001225 therapeutic effect Effects 0.000 description 2
- SCYULBFZEHDVBN-UHFFFAOYSA-N 1,1-Dichloroethane Chemical compound CC(Cl)Cl SCYULBFZEHDVBN-UHFFFAOYSA-N 0.000 description 1
- FKTHNVSLHLHISI-UHFFFAOYSA-N 1,2-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC=C1CN=C=O FKTHNVSLHLHISI-UHFFFAOYSA-N 0.000 description 1
- SBJCUZQNHOLYMD-UHFFFAOYSA-N 1,5-Naphthalene diisocyanate Chemical compound C1=CC=C2C(N=C=O)=CC=CC2=C1N=C=O SBJCUZQNHOLYMD-UHFFFAOYSA-N 0.000 description 1
- PISLZQACAJMAIO-UHFFFAOYSA-N 2,4-diethyl-6-methylbenzene-1,3-diamine Chemical compound CCC1=CC(C)=C(N)C(CC)=C1N PISLZQACAJMAIO-UHFFFAOYSA-N 0.000 description 1
- QWGRWMMWNDWRQN-UHFFFAOYSA-N 2-methylpropane-1,3-diol Chemical compound OCC(C)CO QWGRWMMWNDWRQN-UHFFFAOYSA-N 0.000 description 1
- KHUIRIRTZCOEMK-UHFFFAOYSA-N 2-methylpropyl 3,5-diamino-4-chlorobenzoate Chemical compound CC(C)COC(=O)C1=CC(N)=C(Cl)C(N)=C1 KHUIRIRTZCOEMK-UHFFFAOYSA-N 0.000 description 1
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 1
- IBOFVQJTBBUKMU-UHFFFAOYSA-N 4,4'-methylene-bis-(2-chloroaniline) Chemical compound C1=C(Cl)C(N)=CC=C1CC1=CC=C(N)C(Cl)=C1 IBOFVQJTBBUKMU-UHFFFAOYSA-N 0.000 description 1
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N EtOH Substances CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 1
- 239000005058 Isophorone diisocyanate Substances 0.000 description 1
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 1
- QORUGOXNWQUALA-UHFFFAOYSA-N N=C=O.N=C=O.N=C=O.C1=CC=C(C(C2=CC=CC=C2)C2=CC=CC=C2)C=C1 Chemical compound N=C=O.N=C=O.N=C=O.C1=CC=C(C(C2=CC=CC=C2)C2=CC=CC=C2)C=C1 QORUGOXNWQUALA-UHFFFAOYSA-N 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- SLINHMUFWFWBMU-UHFFFAOYSA-N Triisopropanolamine Chemical compound CC(O)CN(CC(C)O)CC(C)O SLINHMUFWFWBMU-UHFFFAOYSA-N 0.000 description 1
- MRUXVMBOICABIU-UHFFFAOYSA-N [3,5-bis(methylsulfanyl)phenyl]methanediamine Chemical compound CSC1=CC(SC)=CC(C(N)N)=C1 MRUXVMBOICABIU-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 235000010290 biphenyl Nutrition 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 125000005442 diisocyanate group Chemical group 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- 229910003471 inorganic composite material Inorganic materials 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 229940100573 methylpropanediol Drugs 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
Abstract
The invention relates to an optical film, which is made of polyurethane, wherein the polyurethane comprises a soft segment and a hard segment, and the soft segment is composed of a molecular chain formed by chiral polyalcohol. The optical rotation film can control the polarization direction of linear polarized light through strain, wherein the adjustment range of the direction is 0-360 degrees, the polarized light transmitted through the optical rotation film can be reduced from the strongest light intensity to 0 so as to realize light and shade change in an optoelectronic device, and the change can be periodically repeated in the dynamic stretching process. The invention also relates to a preparation method of the optical film and an optoelectronic device using the optical film.
Description
Technical Field
The present invention relates to an optical film, and more particularly, to an optical film, a method for producing the same, and an optoelectronic device.
Background
Polarized light is widely used in life, such as the well-known cancer diagnosis and treatment technology; 3D cine imaging techniques; sky navigation technology, etc., in these applications, there is often a need for a material that can rotate the plane of polarization of polarized light, which is a polarizing material, and a commonly used polarizing material is a polarizing film, and as the name implies, the polarizing film can change the plane of polarization of polarized light, but most polarizing films in the present stage have two relatively large drawbacks, firstly, most polarizing films are made of inorganic composite materials, which tend to have relatively hard textures, relatively high moduli, and lack flexibility, which limits their application in bendable devices. Therefore, the advantage of the organic polarizing film is reflected, the organic polymer material can solve the rigidity problem, for example, the polarizing film of the uniaxially stretched polyvinyl alcohol film for adsorbing iodine pigment solves the rigidity problem of the inorganic polarizing film. But simply solving the stiffness problem is far from adequate.
On the other hand, the polarizing film on the market at present can rotate the polarization plane at a fixed angle, cannot change the polarization plane of the polarized light at multiple angles and multiple periods. This increases the number of replacements of the polarizing film. If a polarizing material is capable of changing the polarization plane of polarized light to different degrees under different conditions and has the characteristics of a flexible material, the application of the material can be greatly improved, and the material can be called a flexible optically active film. In addition, the raw materials of the optical film have wide sources as far as possible, are low in price and have no pollution to the environment.
Disclosure of Invention
Based on this, it is necessary to provide an optical film, a method for producing the same, and an optoelectronic device, in order to solve the above-mentioned problems; the optical film has flexibility and can adjust the direction and intensity of polarized light at multiple angles and multiple periods.
The material of the optical film is polyurethane, wherein the polyurethane comprises a soft segment and a hard segment, and the soft segment is composed of a molecular chain formed by chiral polyalcohol.
In one embodiment, the mass ratio of the soft segment to the hard segment is 10:1-10:9.
In one embodiment, the polyurethane has a number average molecular weight of 10000 to 60000.
In one embodiment, the optically active film has a light transmittance of 90% or more at a wavelength of 380nm to 1650nm and a light transmittance of 85% or more at a wavelength of 1700nm to 2200 nm.
In one embodiment, the optically active film has a strain range of 600% or less.
In one embodiment, the optically active film has a thickness of 5mm or less.
A method for producing an optically active film, comprising:
providing a solution containing polyurethane, wherein the polyurethane comprises a soft segment and a hard segment, and the soft segment consists of a molecular chain formed by chiral polyalcohol;
providing a substrate, placing the solution on the substrate, and forming to obtain the optical film.
In one embodiment, the molding temperature is 0-60 ℃ and the molding time is 24-72 hours.
An optoelectronic device comprising the optically active film described above and a stretching device for stretching the optically active film.
In one embodiment, the speed of stretching the optically active film is from 0.1mm/s to 0.8mm/s.
The material of the optical film is polyurethane, and the soft section of the optical film is composed of a molecular chain formed by chiral polyalcohol, so that the optical film has the effect of changing the polarization direction of linear polarized light and the light intensity of transmitted light, and the change angle and the light intensity of the polarization direction are related to the thickness of the optical film. Specifically, in the stretching process, the optically active film is stretched along the stretching direction, the thickness is gradually thinned, the polarization direction of the corresponding polarized light is periodically changed between 0 and 360 degrees, and the polarized light transmitted through the optically active film can be reduced from the strongest light intensity to 0, so that the periodical change of brightness and darkness is realized in the optoelectronic device.
In addition, the optical rotation film has good mechanical property, belongs to flexible devices, has the elongation at break of more than 600 percent and the modulus of more than 50MPa, has durability, heat resistance, light transmittance, biodegradation function and the like, and can be circularly stretched for 1000 times with 10 percent strain under the condition of circular stretching, so that the optical rotation film has stable performance, thereby further adjusting and improving the utilization range of polarized light, such as the field of photoelectric devices such as 3D films, biological disease diagnosis of infrared polarization therapeutic instruments and the like.
Drawings
FIG. 1 is a scattering image of the optically active films of examples 1 to 3 of the present invention under different strains;
FIG. 2 is the strain of the optically active films of examples 1 and 2 according to the present invention corresponding to the polarization direction horizontally or vertically;
FIG. 3 is a graph showing the transmittance test of the optical films of examples 1 to 3 of the present invention;
FIG. 4 is a graph showing the mechanical properties of the optical films of examples 1 and 2 of the present invention.
Detailed Description
The optical film, the method for producing the same, and the photovoltaic device provided by the invention will be further described below.
The optical film material provided by the invention is polyurethane, wherein the polyurethane comprises a soft segment and a hard segment, and the soft segment is composed of a molecular chain formed by chiral polyalcohol. Thus, the optically active film is made to have an effect of changing the polarization direction of linearly polarized light and the intensity of transmitted light, and the change angle of the polarization direction and the light emphasis are related to the thickness of the optically active film (i.e., the thickness of the soft segment).
Specifically, in the stretching process, the thickness of the optically active film may be changed along with the change of the strain, so that the degree of change of the polarization direction of the linearly polarized light may be changed along with the change of the strain, and particularly may be periodically changed between 0 and 360 degrees, and meanwhile, the polarized light transmitted through the optically active film may be reduced from the strongest light intensity to 0, so as to realize the periodic change of brightness in the optoelectronic device.
In order to ensure that the optical film can adjust the polarization direction and the light intensity of polarized light in a multi-angle and multi-period way, the mass ratio of the soft segment to the hard segment in the polyurethane is preferably 10:1-10:9, more preferably 10:6-10:8, and even more preferably 10:7.
Specifically, the polyurethane is obtained by reacting chiral polyol, isocyanate and chain extender. Wherein the chiral polyol provides soft segments in the polyurethane as a copolymer, preferably comprising at least one of a levorotatory polylactic acid polyol, a dextrorotatory polylactic acid polyol, a chiral cyclic polycarbonate polyol, a chiral binaphthyl polyol. In view of the convenience of the source of the polyol and the mechanical properties of the different materials, the chiral poly polyol is further preferably a levorotatory poly lactic acid polyol.
The isocyanate provides hard segments in the polyurethane as a copolymer, including diphenylmethane diisocyanate, 1, 5-naphthalene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, 3, -dimethyl-4, -at least one of diphenyl diisocyanate, triphenylmethane triisocyanate, toluene diisocyanate, 4',4 "-thiophosphoric triphenyltriisocyanate, cyclohexanedimethylene diisocyanate, 4' -dicyclohexylmethane diisocyanate, 3 '-dimethyl-4, 4' -diphenylmethane diisocyanate. The isocyanate is further preferably 4,4' -dicyclohexylmethane diisocyanate from the viewpoint of stability of mechanical properties of polyurethane.
The chain extender preferably comprises at least one of 3,3 '-dichloro-4, 4' -diaminodiphenylmethane, isobutyl 3, 5-diamino-p-chlorobenzoate, diethyltoluenediamine, 3, 5-dimethylthiotoluenediamine, ethanolamine, diethanolamine, triethanolamine, triisopropanolamine, small molecule polyols comprising at least one of 1, 4-butanediol, ethylene glycol, propylene glycol, methylpropanediol, diethylene glycol, 1, 4-cyclo-ethanol, neopentyl glycol, 1, 6-hexanediol. From the viewpoint of simplicity of preparation and practicality of polyurethane, the chain extender is further preferably a small-molecule polyol, so that the obtained optically active film has better performance stability and longer service life.
Preferably, to further improve the performance of the optical film, the soft segment further preferably consists of a molecular chain formed by the chiral polyol and other achiral polyols, preferably polytetrahydrofuran polyol, in a mass ratio of 1:4 to 1:1. In order to prevent a higher modulus during the preparation of the optically active film, the mass ratio is further preferably 1:3, the chain extender is preferably a small molecule polyol, and the isocyanate is preferably 4,4' -dicyclohexylmethane diisocyanate.
In addition, the polyurethane may be modified with one or more graft copolymerizable monomers including a polyhydric alcohol, an unsaturated carboxylic acid or other derivatives, etc., in order not to reduce the effect of the optically active film, the proportion of the structural units of the graft copolymerizable monomers in the total structural units of the polyurethane is 10% or less.
The number average molecular weight of the polyurethane is preferably in the range of 10000 to 60000, more preferably 20000 to 30000, from the viewpoint of polarization angle performance of the optically active film.
Wherein, when the number average molecular weight is 24000 or more, the performance of the optically active film is improved, and at the same time, in order to secure the production efficiency of the optically active film, the number average molecular weight of the polyurethane is more preferably 24000 to 30000, and still more preferably 28000 to 30000.
In order to ensure the light transmission effect of the optical film, the light transmission rate of the optical film at the wavelength of 380 nm-1650 nm is more than or equal to 90% and the light transmission rate at the wavelength of 1700 nm-2200 nm is more than or equal to 85% under static state.
The optical rotation film belongs to a flexible device, the elongation at break reaches more than 600%, the modulus is more than 50MPa, and the mechanical property is excellent. Therefore, the strain range of the optical film is less than or equal to 600 percent, and the changing requirements of different polarization directions can be met. The strain range of the optically active film is 10% or less, more preferably 5% or less, from the viewpoints of the recovery of the optically active film and the convenience of adjustment of the polarization direction, that is, the requirement of changing the polarization direction can be satisfied.
In order to facilitate the process of changing the strain of the optical film, the optical film is preferably in a long strip shape, and the length L and the width W of the long strip shape of the optical film are not particularly limited, and may be adjusted according to the use, so as to ensure that the optical film can be uniformly stretched in the process of changing the strain.
Meanwhile, the thickness of the optically active film is not particularly limited, and preferably 5mm or less, and in order to improve the performance of the optically active film, 1mm or less, and 0.5mm or less, 0.1mm or less, and 0.01mm or less may be further preferred. However, if the thickness of the optically active film is too thin, the manufacturing cost is increased, and at the same time, the polarizing performance of the optically active film is also adversely affected. Therefore, the thickness of the optically active film is preferably in the range of 0.1mm to 1mm, more preferably 0.1mm to 0.5mm, and still more preferably 0.1mm to 0.2mm.
Therefore, the invention can control the intensity and the direction of the linear polarized light through the strain of the optical rotation film, wherein the adjustment range of the direction is 0-360 degrees, the light transmission intensity can be reduced from the strongest light intensity to 0 so as to realize the brightness change in the photoelectric device, and the change can be periodically repeated in the dynamic stretching process so as to replace the polarization film to be better applied to the fields of the photoelectric devices such as 3D films, biological disease diagnosis of infrared polarization therapeutic instruments and the like.
The invention also provides a preparation method of the optical film, which comprises the following steps:
s1, providing a solution containing polyurethane, wherein the polyurethane comprises a soft segment and a hard segment, and the soft segment consists of a molecular chain formed by chiral polyalcohol;
s2, providing a matrix, placing the solution on the matrix, and forming to obtain the optical film.
In step S1, the solvent of the solution includes at least one of dichloroethane, trichloroethane, tetrachloroethane, tetrahydrofuran, N-dimethylformamide, preferably trichloroethane. The mass ratio of the polyurethane to the solvent is 1:5-1:10, and is preferably 1:8 in order to make the molding process of the optical film more perfect.
In the step S2, the substrate is preferably a monocrystalline silicon wafer, the molding temperature is 0-60 ℃, the molding time is 24-72 hours, and different processing temperatures are selected according to different solvents. The molding temperature is preferably 5℃and the molding time is preferably 54 hours in view of the production efficiency, polarization properties and service life of the optically active film.
The invention also provides an optoelectronic device which comprises the optical rotation film and a stretching device, wherein the stretching device is used for stretching the optical rotation film, and the optoelectronic device can realize the periodical change from light to dark and from dark to light.
The stretching device is not particularly limited in the stretching operation of the optically active film, and may be monoaxial stretching or biaxial stretching, and the stretching speed is in the range of 0.1mm/s to 0.8mm/s, so as to avoid excessively rapid change in the direction of polarized light. Further, in order to more facilitate the adjustment accuracy of the optically active film, biaxial stretching is preferable, and the stretching speed is 0.125mm/s.
Hereinafter, the optical film, the method of producing the same, and the photovoltaic device will be further described by the following specific examples.
Example 1:
polyurethane and trichloroethane are prepared into a solution according to the mass ratio of 1:5. The polyurethane is obtained by copolymerizing levorotatory polylactic acid polyol, polytetrahydrofuran polyol, 1, 4-butanediol and 4,4' -dicyclohexylmethane diisocyanate, the number average molecular weight of the polyurethane is 30000g/mol, the polyurethane comprises a soft segment and a hard segment, wherein the structural unit of the levorotatory polylactic acid polyol accounts for 20% of the total mass of the soft segment, and the mass ratio of the soft segment to the hard segment is 10:6.
The solution is placed on a monocrystalline silicon piece and molded for 54 hours at 5 ℃ to obtain an optical rotation film with the thickness of 0.1mm, when the strain range of the optical rotation film is 0-10%, polarized light can be periodically changed at 0-360 degrees, and the polarized light transmitted through the optical rotation film can be reduced from the strongest light intensity to 0.
Example 2:
polyurethane and trichloroethane are prepared into a solution according to the mass ratio of 1:7. The polyurethane is obtained by copolymerizing levorotatory polylactic acid polyol, polytetrahydrofuran polyol, 1, 4-butanediol and 4,4' -dicyclohexylmethane diisocyanate, the number average molecular weight of the polyurethane is 28000g/mol, the polyurethane comprises a soft segment and a hard segment, wherein the structural unit of the levorotatory polylactic acid polyol accounts for 30% of the total mass of the soft segment, and the mass ratio of the soft segment to the hard segment is 10:7.
The solution is placed on a monocrystalline silicon piece and molded for 54 hours at 5 ℃ to obtain an optical rotation film with the thickness of 0.15mm, when the strain range of the optical rotation film is 0-10%, polarized light can be periodically changed at 0-360 degrees, and the polarized light transmitted through the optical rotation film can be reduced from the strongest light intensity to 0.
Example 3:
polyurethane and trichloroethane are prepared into a solution according to the mass ratio of 1:8. The polyurethane is obtained by copolymerizing polylactic acid polyol, polytetrahydrofuran polyol, 1, 4-butanediol and 4,4' -dicyclohexylmethane diisocyanate, the number average molecular weight is 22000g/mol, the polyurethane comprises a soft segment and a hard segment, wherein the structural unit of the levorotatory polylactic acid polyol accounts for 40% of the total mass of the soft segment, and the mass ratio of the soft segment to the hard segment is 10:8.
The solution is placed on a monocrystalline silicon piece and is molded for 54 hours at the temperature of 5 ℃ to obtain an optical rotation film with the thickness of 0.2mm, when the strain range of the optical rotation film is 0-10%, polarized light can be periodically changed at 0-360 degrees, and the polarized light transmitted through the optical rotation film can be reduced from the strongest light intensity to 0.
Example 4:
polyurethane and trichloroethane are prepared into a solution according to the mass ratio of 1:10. The polyurethane is obtained by copolymerizing levorotatory polylactic acid polyol, polytetrahydrofuran polyol, 1, 4-butanediol and 4,4' -dicyclohexylmethane diisocyanate, the number average molecular weight is 25000, the polyurethane comprises a soft segment and a hard segment, wherein the structural unit of the levorotatory polylactic acid polyol accounts for 50% of the total mass of the soft segment, and the mass ratio of the soft segment to the hard segment is 10:8.
The solution is placed on a monocrystalline silicon piece and molded for 54 hours at 5 ℃ to obtain an optical rotation film with the thickness of 0.15mm, when the strain range of the optical rotation film is 0-10%, polarized light can be periodically changed at 0-360 degrees, and the polarized light transmitted through the optical rotation film can be reduced from the strongest light intensity to 0.
Comparative example 1:
comparative example 1 differs from example 1 in that the levorotatory polylactic acid polyol is replaced with a racemic polylactic acid polyol.
The optical films of examples 1 to 4 and comparative example 1 were subjected to partial performance test, and the method and results were as follows:
the polarizing film of examples 1 to 3 changes the polarization direction of the polarized light transmitted through the polarizing film, and the light is a vector unit, so that a component is generated in the vertical direction and a scattered image is formed on the imaging screen. Since the strain of the optically active film changes the different polarization directions, the vertical component also changes continuously, and the scattered image changes brightest to darkest. Defining the brightest scattering image as the origin, the changed polarization direction under a certain strain is θ° when the scattering image under the certain strain can reach the brightest after the analyzer rotates θ°. In the strain change process of the optical film, the periodic change of the scattering image displayed on the imaging screen is shown in fig. 1, and the brightest or darkest periodic rule statistics of the scattering image are shown in fig. 2. As can be seen from fig. 1 and 2, the optical rotation film changes continuously during stretching, so that the polarization direction of polarized light changes continuously, the component in the vertical direction changes continuously (i.e., the component passing through the analyzer) and the scattered image appearing on the image screen changes in brightness and darkness, and the change is periodic during the increase of strain.
The optical films obtained in examples 1 to 4 and comparative example 1 were measured by an ultraviolet spectrophotometer, and the results are shown in FIG. 3, in which the abscissa indicates the wavelength of light transmitted through the optical film, the transmittance of the optical film for light in the wavelength range of 380 to 1650nm was 90.8%, and the transmittance of the optical film for g light in the wavelength range of 1700 to 2200nm was 86%, indicating that the optical film maintains high transmittance for most of the light in the wavelength range.
The optically active films prepared in examples 1 and 2 were tested on a universal stretcher, and the stress-strain curves are shown in FIG. 4, which shows that the optically active films in examples 1 and 2 can have an elongation at break of 600% or more and a modulus of less than 50MPa, which meets the requirements of flexible materials.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The optical film is characterized in that the optical film is made of polyurethane, the polyurethane comprises a soft segment and a hard segment, the soft segment is composed of a molecular chain formed by chiral polyalcohol, and the chiral polyalcohol comprises at least one of L-polylactic acid polyalcohol, D-polylactic acid polyalcohol and chiral cyclic polycarbonate polyalcohol;
the optical rotation film can adjust the polarization direction and the light intensity of polarized light in a multi-angle and multi-period mode, the optical rotation film stretches along the stretching direction in the stretching process, the film thickness is gradually thinned, the polarization direction of the corresponding polarized light changes periodically within 0-360 degrees, and the polarized light transmitted through the optical rotation film can be reduced from the strongest light intensity to 0 so as to realize periodical change of brightness in an optical device.
2. The optically active film according to claim 1, wherein the mass ratio of the soft segment to the hard segment is 10:1 to 10:9.
3. The optically active film according to claim 1, wherein the polyurethane has a number average molecular weight of 10000 to 60000.
4. The optically active film according to claim 1, wherein the optically active film has a light transmittance of 90% or more at a wavelength of 380nm to 1650nm and a light transmittance of 85% or more at a wavelength of 1700nm to 2200 nm.
5. The optically active film of claim 1, wherein the optically active film has a strain range of 600% or less.
6. The optically active film according to claim 1, wherein the thickness of the optically active film is 5mm or less.
7. A process for producing an optically active film as claimed in any one of claims 1 to 6, comprising:
providing a solution containing polyurethane, wherein the polyurethane comprises a soft segment and a hard segment, and the soft segment consists of a molecular chain formed by chiral polyalcohol;
providing a substrate, placing the solution on the substrate, and forming to obtain the optical film.
8. The process for producing an optically active film according to claim 7, wherein the molding temperature is 0℃to 60℃and the molding time is 24 hours to 72 hours.
9. An optoelectronic device comprising the optically active film of any one of claims 1 to 6, wherein the optically active film is stretched by a stretching device.
10. The optoelectronic device according to claim 9, wherein the speed of stretching the optically active film is 0.1mm/s to 0.8mm/s.
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