WO2005085330A1 - 光屈曲性液晶成形体 - Google Patents
光屈曲性液晶成形体 Download PDFInfo
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- WO2005085330A1 WO2005085330A1 PCT/JP2004/002607 JP2004002607W WO2005085330A1 WO 2005085330 A1 WO2005085330 A1 WO 2005085330A1 JP 2004002607 W JP2004002607 W JP 2004002607W WO 2005085330 A1 WO2005085330 A1 WO 2005085330A1
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- Prior art keywords
- light
- liquid crystal
- response
- polymerizable monomer
- crystal molded
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
- C08F20/10—Esters
- C08F20/34—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate
- C08F20/36—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate containing oxygen in addition to the carboxy oxygen, e.g. 2-N-morpholinoethyl (meth)acrylate or 2-isocyanatoethyl (meth)acrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
Definitions
- the present invention relates to a method of responding to light bending and restoration (that is, light bending and elongation) of a light bending liquid crystal molded article.
- Liquid crystals are substances that have both the fluidity of liquids and the orientation of crystals.They are widely used as liquid crystal displays, and are also used in photonic materials such as high-speed optical switching, optical recording, and holography. Expectations are high for other uses.
- the present inventors have recently proposed a photo-flexible liquid crystal film which exhibits a photo-bending-one restoration response in response to light irradiation (Japanese Patent Application Laid-Open No. 2002-25601; Adv. Mater. 2003, 15, No. 3, February 5).
- This photoflexible liquid crystal film uses 6- [4- (4-hexyloxyphenylazo) phenoxy] hexyl acrylate as an azobenzene-containing monomer and 4,4'-bis [6- (acryloyloxy)
- the oriented film has a birefringent property and a uniaxial orientation property even when immersed in toluene and swells. When irradiated with ultraviolet light having a wavelength of 360 nm, the oriented film is perpendicular to the orientation direction.
- the present invention provides a light-flexible liquid crystal molded body such as a light-flexible liquid crystal film having a polydomain structure, which exhibits a light-bending-one-restoration response in response to light irradiation, and a light-bending-one-restoration response in response to light irradiation. And irradiating the light-flexible liquid crystal molded article having a polydomain structure with light, and causing the light-flexible liquid crystal molded article to perform a light-bending-recovery response.
- a flexion-restoration response method is provided.
- FIGS. 1 (a) and 1 (b) are diagrams showing the optical bending response of the optically flexible liquid crystal film of the present invention.
- the photoflexible liquid crystal molded article according to the present invention exhibits a photorefractive-in-one restoration response in response to light irradiation, and has a domain structure.
- Examples of the form of the molded body include a film and a sheet. The film will be described below.
- the light bending-restoration response can be bent and restored in an arbitrary direction by selecting a light irradiation direction. That is, when the light having the first specific wavelength is irradiated, the liquid crystal film bends. However, even if the irradiation is stopped, the bending is maintained, and when the light having the second specific wavelength is irradiated, the liquid crystal film can be restored to the original shape.
- the first or second specific wavelength induces photoisomerization, and varies depending on the type of the optically flexible liquid crystal film.
- the first specific wavelength is the wavelength belonging to the absorption band of the trans-form
- the second specific wavelength is the absorption band of the cis-form.
- which is a wavelength that does not overlap with the absorption band of the transformer.
- the first specific wavelength is preferably from 300 to 400, depending on the substituents bonded to the azobenzene structure.
- the second specific wavelength is about 500-650 nm.
- Polarized or non-polarized light is used as the irradiation light.
- polarized light is preferably used for bending and non-polarized light is used for restoration. That is, it is preferable that the photoflexible liquid crystal film of the present invention exhibits a photoflexion response in a direction corresponding to a polarization direction in response to polarized light irradiation, and a restoration response in response to non-polarized light irradiation.
- the irradiation amount of the light is not particularly limited, when the bending is selected from usually 1 ⁇ 1 0 O m J / cm 2 and - usually 1 0 during the restoration 1 0 0 O m J / cm 2,.
- Such a photoflexible liquid crystal film is composed of a monofunctional polymerizable monomer having a reversible photoisomerizable group and a polyfunctional polymerizable monomer copolymerizable with the monofunctional polymerizable monomer. It is characterized by being made of a polymer and not being subjected to an orientation treatment.
- Examples of the monofunctional polymerizable monomer include those having a group capable of trans-cis photoisomerization or ring-opening-ring photoisomerization.
- Monofunctional polymerizable monomers having a trans-cis photoisomerizable group include For example, those having an azobenzene structure or a stilpene structure can be cited, but those having an azobenzene structure have different absorption wavelengths of trans and cis-forms, and have a large change in molecular shape due to isomerization. It is preferable from the point.
- Examples of the monofunctional polymerizable monomer having a ring-opening-ring-closing photoisomerizable group include those having a spiropyran structure or a diaryl structure.
- This monofunctional polymerizable monomer is used in order to exhibit an appropriate photo-bending-restoration response in a copolymer obtained by copolymerizing with a polyfunctional polymerizable monomer, so that the monofunctional polymerizable monomer (for example, the azobenzene-containing monomer described above) is used.
- the monofunctional polymerizable monomer for example, the azobenzene-containing monomer described above
- a long-chain polymer segment having a certain size is formed, and a cross-linked structure in which the long-chain polymer segment is cross-linked with an appropriate density by a polyfunctional polymerizable monomer is formed.
- examples of the polyfunctional polymerizable monomer include bifunctional or trifunctional or higher (meth) acrylic acid esters.
- the multifunctional polymerizable monomer may have the same reversible photoisomerizable group as the monofunctional polymerizable monomer having a reversible photoisomerizable group.
- 6- [4- (4-hexyloxyphenylazo) phenoxy] hexyl acrylate represented by the following formula (1):
- the amount ratio of these monofunctional polymerizable monomers and polyfunctional polymerizable monomers is usually 95 to 70 mol. /. : 5-3 0 mol%, preferably 9 0-7 5 Monore% is selected from: 1 0-2 5 mol 0/0.
- the polymerization method itself can be carried out by a conventionally used copolymerization method. For example, except that a rubbing treatment is carried out, the polymerization method is described in JP-A-2002-256030. The same method can be used. That is, it is preferable to form a molded article such as a film at the same time as the copolymerization by the cast polymerization method.
- the polymerization is preferably carried out by thermal polymerization or photopolymerization.
- the thermal polymerization is carried out, for example, by using a polymerization initiator of 1 to 10 wt%, in air, at normal pressure and without a solvent at 50 to 120 °. Heated to C.
- the photopolymerization is performed by irradiating light in such thermal polymerization.
- the thickness of the film may be appropriately selected according to the purpose, but is usually about 1 to 50 ⁇ m.
- the photoflexible liquid crystal film of the present invention has a polydomain structure.
- the domain size of the polydomain structure is preferably from 511111 to 101111. Duru. Due to this domain structure, the photoflexible liquid crystal film of the present invention has, for example, azobenzene molecules of various orientations, and is made of a swelling liquid such as toluene, macropore form, and ethyl acetate.
- a swelling liquid such as toluene, macropore form, and ethyl acetate.
- the azobenzene molecule is oriented in parallel to the polarization direction. The main selectively absorbs light and isomerizes to cis rather than trans form.
- FIG. 1 (a) and 1 (b) schematically show the optical bending response of the optically flexible liquid crystal film of the present invention, where 1 indicates linearly polarized light, and 2 indicates the orientation direction of the azobenzene molecule. Show.
- the light-flexible liquid crystal film is photoisomerized from a trans-form to a cis-form by irradiation with linearly polarized light, and responds to light bending in a direction corresponding to the polarization direction. When irradiated with visible light, it is photoisomerized from the cis to the trans form and responds to the restoration.
- the optically bendable liquid crystal molded article of the present invention has the above-mentioned optical bend-restoration response characteristics, and can be used for various applications. For example, it can be used for plastic motors, optical elements, display elements, switching elements, storage elements, toys, and the like.
- 6- [4- (4-Hexyloxyphenylazo) phenoxy] hexyl acrylate (monofunctional polymerizable monomer) can be obtained, for example, by the following method.
- 4 12-Hexoxynitrate benzene is synthesized by reacting 4 12-trophenol, 1-bromohexane, and carbonic acid carbonate, and sodium borohydride is added to the obtained reaction product.
- the reaction is carried out in the presence of a palladium catalyst to give 4-hexyloxyline.
- sodium nitrite is added to the hydrogen chloride solution of the obtained reaction product to cause a reaction, and furthermore, a solution obtained by adding phenol to a sodium hydroxide aqueous solution is added to carry out the reaction.
- 4,4'-Bis [6- (acryloyloxy) hexyloxy] azobenzene (a polyfunctional polymerizable monomer) can be obtained, for example, by the following method. 4—Nitrophenol, 1-neck hexanol, and potassium carbonate are reacted to synthesize 4- (1-hydroxyhexyloxy) nitrobenzene, and the resulting reaction product is treated with boron hydride. 4- (6-Hydroxyhexyloxy) aniline is obtained by adding tritium and reacting in the presence of a palladium catalyst.
- the mixture was heated to 100 ° C. to make an isotropic phase, and a silica bead was inserted between two glass substrates to form a gap of about 10 ⁇ m in a cell obtained.
- the above mixture was filled, gradually cooled to 0.5 ° C / minute to 85 ° C, and irradiated with light of 540 nm or more from a super high pressure mercury lamp of 540 nm or more for 2 hours for polymerization. did. Thereafter, the polymerization reaction product was taken out of the cell, and further washed with a cross-linked form to remove unreacted monomers.
- the azobenzene molecules were oriented in one direction in each domain, but the orientation of each domain was random and had a polydomain structure.
- optically bendable liquid crystal molded article of the present invention is used in various applications such as plastic motors, optical elements, display elements, switching elements, storage elements, toys, etc. by utilizing the optical bend-restoration response characteristics. be able to.
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
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- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
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Priority Applications (1)
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PCT/JP2004/002607 WO2005085330A1 (ja) | 2004-03-03 | 2004-03-03 | 光屈曲性液晶成形体 |
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PCT/JP2004/002607 WO2005085330A1 (ja) | 2004-03-03 | 2004-03-03 | 光屈曲性液晶成形体 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105500857A (zh) * | 2015-12-18 | 2016-04-20 | 北京大学 | 一种具有双层膜结构的光驱动复合材料及其制备方法 |
-
2004
- 2004-03-03 WO PCT/JP2004/002607 patent/WO2005085330A1/ja active Application Filing
Non-Patent Citations (1)
Title |
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MAKOTO NAKANO ET AL: "Photoresponsive behavior of azobenzene liquid-crystalline gels", MOLECULAR CRYSTALS AND LIQUID CRYSTALS, vol. 398, 2003, pages 1 - 9, XP002979386 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105500857A (zh) * | 2015-12-18 | 2016-04-20 | 北京大学 | 一种具有双层膜结构的光驱动复合材料及其制备方法 |
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