949 results about "Azobenzene" patented technology

The invention relates to a method for regulating the optical performance of liquid crystals by using azobenzene and belongs to the field of application of photosensitive materials and liquid crystal materials. A matrix material consists of liquid crystal molecules, chiral molecules and photoresponsive azobenzene molecules. In the invention, the liquid crystal molecules, chiral molecules and photoresponsive azobenzene molecules are mixed in a certain proportion and filled into a liquid crystal box. The optical field control over the optical performance of the liquid crystal composite can be realized by regulating the chiral molecule content and azobenzene molecule content in the system. Different from the conventional methods for regulating the optical performance of the liquid crystals byelectric field, magnetic field and temperature, the method can realize optical field reversible regulation of the photopermeability and reflectivity of the liquid crystal box. The method can promote the better use of liquid crystal materials in fields of optical storage, optical display and optical switches.

A process for preparing the benzotriazole as photostabilizer includes such steps as dissolving 2-nitro-2'-hydroxy-5'-methyl azobenzene and 2-nitro-2'-hydroxy-3'- tert-butyl-5'-methyl propionate azobenzene in the mixture of alcohol and alkali solution, adding hydrazine hydrate, heating, reflux reaction, using hydrochloric acid to neutralize the reaction liquid, depositing, filtering, water washing, drying to obtain an intermediate, dissolving it in the mixture of alcohol and alkali, adding sodium dithionate, stirring while reacting, adding ice water, neutralizing, filtering, drying, and recrystallizing in alcohol or isopropanol.

The invention discloses a new photo-induced deforming liquid crystal macromolecular material in liquid crystal macromolecular material technical domain, which is characterized by the following: choosing ethoxyl group as main chain and azo-benzene derivant as lateral chain with part crosslinking; choosing azo-benzene derivant of monocyclic oxygen group and bicycle oxygen group as monomer; mixing finite quantity light trigger and trigger of positive ion; putting into reactor; choosing proper reacting temperature; copolymerizing the light trigger positive ion under the function of wavelength light; getting the product. This material is a controlled photo-inducer flexural deformation material, which can be used to study driver and artificial muscle.

The invention belongs to the technical field of an intelligent material and particularly relates to a reversible photoinduced deformation liquid crystal high polymer and carbon nano tube composite thin film and a preparation method thereof. A liquid crystal high polymer in the composite thin film is a cross-linked type liquid crystal elastic body containing a photosensitive azobenzene liquid crystal element; and a carbon nano tube is a highly and sequentially oriented carbon nano tube thin film. In the composite thin film, a carbon nano tube orienting structure induces the liquid crystal element to be oriented along the axial direction of the carbon nano tube; and other orienting layers are not needed. When the prepared composite thin film is in ultraviolet illumination, the composite thin film is bent towards lights and can be recovered to the original state when the composite thin film is irradiated by visible lights. Reversible deformation generated by alternatively illuminating the composite thin film by ultraviolet lights and visible lights can be repeated for hundreds of times and has no obvious attenuation and fatigue. Moreover, the introduction of the carbon nano tube greatly enhances the mechanical performance of the material, and the material has excellent electric performance.

The invention relates to a method for synthesizing a visible-light response type azobenzene polymer. The method comprises the following steps: preparing tetramethoxy dihydroxyazobenzene from 2,6-dimethoxyaniline and 3,5-dimethoxy phenol through diazo-reaction, reacting tetramethoxy dihydroxyazobenzene as a raw material with 6-bromohexane alcohol to prepare tetramethoxy-4-ethanol oxyl azobenzene, grafting azobenzene onto a polypropylene acyl chloride framework through alcoholysis reaction of acyl chloride groups, and converting unreacted acyl chloride groups into carboxyl through hydrolysis, thereby finally obtaining the visible-light response type azobenzene polymer, namely, a 2-(2,6,2',6'-tetramethoxy-4-hexyloxy azobenzene phenoxy) crylic acid ethyl ester acrylic copolymer. The method has the advantages that the method is simple and feasible, the synthesized polymer has visible-light response type azobenzene groups, trans/cis-form conversion is achieved under the radiation of green light (520nm), reverse conversion can be achieved under radiation of blue light (420nm), and compared with conventional azobenzene molecules, the azobenzene polymer has the most remarkable advantage that bidirectional conversion of isomer can be achieved without ultraviolet light.

The invention discloses a dual-reflection zone cholesteric liquid crystal film with a reversible light response characteristic and a preparation method for the dual-reflection zone cholesteric liquid crystal film. The method comprises the following steps of 1) mixing a chiral compound, a polymerizable monomer, nematic phase liquid crystals and a photoinitiator, pouring the mixture into a liquid crystal box, and irradiating by using ultraviolet light to form a cholesteric phase polymer film; 2) soaking the cholesteric phase polymer film in a nonpolar solvent to remove unreacted micromolecular liquid crystals, and pouring a mixture of binaphthylyl azobenzene compounds and the nematic phase liquid crystals to obtain the dual-reflection zone cholesteric liquid crystal film with the reversible light response characteristic. The film prepared by the method can reflect light in two wave bands and can cover a wavelength range of 500-2,000nm. The film has a good memory effect and has high potential application value in the fields such as adjustable optical filters, adjustable multi-mode laser protection, anti-counterfeiting and liquid crystal display.

The invention belongs to the technical field of liquid crystal polymer materials, and particularly relates to a side chained linear azobenzene liquid crystal polymer material and a preparation method thereof. In the method, a novel liquid crystal polymer material using butadiene-ethylene-functional group substituted ethylene ternary alternative polymer as a main chain and the azobenzene derivative as a side chain structure is synthesized by using an open loop translocation polymerization method through using a 5-substituted cyclooctene (a substituent group is an azobenzene derivative) monomer in the presence of a Grubbs catalyst. According to the invention, the problem that the conventional azobenzene liquid crystal elastomer material is insoluble and is not molted so as not to be prepared by adopting a common machine shaping method. Under the condition of no cross-linked network structure, the side chained linear azobenzene liquid crystal polymer material has the rubber elasticity and good optical response characteristic; and the side chained linear azobenzene liquid crystal polymer material can machined to form liquid crystal polymer materials, such as films and fibers, after molten or dissolved without being limited in machining size and appearance and can be recycled for re-machine shaping after machine-shaping, and is a novel low-carbon and environment-friendly optical response liquid crystal polymer material.

Disclosed is an improvement in an optical information recording method by utilizing a unique phenomenon in which, when a thin film of a polymeric compound having a structure of azobenzene is irradiated spotwise with a light beam of a specified wavelength, a pattern of rugged surface with recesses and raises is resulted by the migration of the polymer molecules from the strongly irradiated area to the weakly irradiated area. The improvement has an object to increase the photosensitivity of this phenomenon by simultaneously irradiating the polymeric thin film with a second or bias light beam of a larger cross section to envelop the irradiation spot by the first or writing light beam.

The invention provides a method for preparing 4-amino diphenylamine by catalytic hydrogenation. The method adopts two sections of hydrogenation reaction processes, and comprises the following steps: performing the condensation reaction of condensation solution formed by the condensation reaction of nitrobenzene and aniline which serve as raw materials under an alkaline condition by using using a noble metal hydrogenation catalyst and a nickel catalyst sequentially so as to make the conversion rate of 4-nitroso diphenylamine, 4-nitro diphenylamine and azoxybenzene achieve 100 percent; and separating the noble metal hydrogenation catalyst and the nickel catalyst by using a two-stage membrane separation component system to avoid the loss of small particles of catalyst. At the same time, the method has high degree of automation and can easily realize the continuous hydrogenation process.

The invention relates to a tri-branched azobenzene/graphene composite energy storage material and a preparation method thereof. According to the invention, tri-branched azobenzene is grafted on single-layer graphene. The method comprises a nucleophilic substitution reaction and a diazonium salt method. First, disperse orange and p-aminoazophenyl-4-sulfonic acid react with trimethyl-1,3,5-benzenetricarboxylic acid, such that tri-branched azobenzene is synthesized; and the tri-branched azobenzene is compounded with pretreated reduced graphene oxide. Compared to azobenzene small molecules, the obtained tri-branched azobenzene/graphene composite material is greatly improved in energy value and half-life period, and facilitates solar energy heat storage. Through DSC detection, the energy density of the prepared tri-branched azobenzene/graphene composite material is 150-250Wh/kg. The material has an important application prospect in solar energy storage in the future.

The invention discloses a preparation method of photosensitive hydrogel. The method comprises 3 steps that: 1, modified cyclodextrin is subject to a reaction with polyacrylic acid, such that cyclodextrin-modified polyacrylic acid is obtained; 2, azobenzene substituted by monoamino is subject to a reaction with polyacrylic acid, such that azobenzene-modified polyacrylic acid is synthesized; and 3, the two polymers are mixed, such that the photosensitive hydrogel is obtained. When the photosensitive hydrogel is irradiated by using ultraviolet light with a certain wavelength, the viscosity of the photosensitive hydrogel is substantially reduced, and the photosensitive hydrogel turns into a movable solution. When irradiation is stopped, a gel state is recovered. The photosensitive hydrogel can be used for preparing light-controlled motors and light-controlled switches. The photosensitive hydrogel can also be used in light-controlled drug-releasing.

The invention relates to a method for photocatalytic synthesis of azoxybenzene and azobenzene compounds. The method comprises the following steps: uniformly mixing a nitrobenzene compound, alkali and alcohol by molar ratio of 1:(0.1-20):(40-1000) to form a liquor; adding a copper/graphene catalyst into the liquor for ultrasonic dispersion for 5-240 minutes by mass ratio of the nitrobenzene compound and the catalyst: 1:(0.001-2); irradiating the dispersed liquor protected by inert gas and stirred with intensity of 0.001-5W/cm<2>, and heating to 20-80 DEG C and reacting for 3-10 hours to obtain the azoxybenzene compound; and heating to over 80 DEG C but below 150 DEG C and reacting for 3-10 hours to obtain the azobenzene compound. The method provided by the invention has the advantages of environmental friendliness, low cost, mild operation condition and high yield.

The invention belongs to the filed of photoresponse high polymer materials and particularly relates to a photoinduced-deformation high polymer material based on a triplet state-triplet state annihilation up-conversion luminescence mechanism. The material is composed of liquid crystal polymers containing azo phenyl groups and up-conversion luminescent materials based on triplet state-triplet state annihilation. The liquid crystal polymers containing the azo phenyl groups do not have the stimulation responsiveness on long-wavelength visible light or near-infrared light. The up-conversion luminescent materials of triplet state-triplet state annihilation are introduced in the material system preparing process, short-wave visible light enabling the azo phenyl groups to have the stimulation response is generated in the up-conversion process, and therefore a whole material system can deform under irradiation of the long-wavelength visible light or the near-infrared light. The long-wavelength visible light or the near-infrared light drives the material system so as to promote application of the photoinduced-deformation high polymer material in field of biochips, aspects of micro executing devices and the like.

Invented are non-peptide TPO mimetics. Also invented is a method of treating thrombocytopenia, in a mammal, including a human, in need thereof which comprises administering to such mammal an effective amount of a selected hydroxy-1-azobenzene derivative.

This invention relates to a method for preparing a hydrogenation palladium or carbon catalyst. The catalyst uses the particles or shaping active carbon as the carrier, loading active component metal Pd, wherein the Pd content is 0.2-5wt%. The preparing method comprises the following steps: a) acid cleaning the carrier active carbon; then flushing with water until neutral; drying; b) preparing Pd solution with water-soluble Pd compound and a complex builder; using Pd solution to immerse or spray the carrier active carbon, loading the Pd compound on the active carbon and then getting the catalyst prosoma, wherein the Pd compound content is 15-20wt% computed by Pd, the molecular ratio of complex builder and Pd is (0.01-1):1, the complex builder is any one from 8-bioquin, 2,3,4-trihydroxy-4-sulfonic acid azobenzene, ortho phenanthroline, o-aminophenol, o-hydroxybenzoic acid sodium or salicylaldehyde benzaldoxime; c) aging the catalyst prosoma, then deacidizing and getting the catalyst.

The invention discloses a cyclic azobenzene amphiphilic segmented copolymer and its preparation method. The preparation method is concretely characterized in that the cyclic azobenzene amphiphilic segmented copolymer with controllable molecular weight, molecular weight distribution and ratio of a hydrophilic segment to a hydrophobic segment is obtained by combining through controllable atom transfer radical polymerization (ATRP) and an efficient CuAAC reaction. Compared with linear polymers having a same molecular weight, the cyclic polymer disclosed in the invention has the advantages of high Tg, fast photo-isomerization, sensitive light and pH response performances in an alkaline medium, and wide application potential in medicine release, surfactants, coatings, adhesives and separation films.

The invention relates to a method for preparing a photic driving self-repair film based on an ethylene-butylene copolymer. The method comprises the steps of an addition reaction and forming of a quadrupolar hydrogen bond. Firstly, 2-amino-4-hydroxy-6-methylpyrimidine and hexamethylene diisocyanate are synthesized into UPy-NCO, then the product and poly(ethylene-butene) and 4.-di(hydroxymethyl) azobenzene react, and the two materials are compounded. The segmented copolymer capable of being repaired by itself under ultraviolet radiation is obtained, and the material is good in flexibility and high in repair efficiency, and can achieve dynamic self-repair in ultraviolet light. The shortest complete repair time of the film is 23 s.

The present application relates to encapsulates, compositions, products comprising such encapsulates, and processes for making and using such encapsulates. Such encapsulates comprise a core comprising a perfume and a shell that encapsulates said core, such encapsulates may optionally comprise a parametric balancing agent, such shell comprising one or more azobenzene moieties.

The invention provides a rhodamine fluorescent probe capable of detecting and separating heavy metal ions, and a preparation method of the rhodamine fluorescent probe, belonging to the field of a functional material. The fluorescent probe is prepared by comprising the following steps: modifying rhodamine B (RhB) serving as raw material so that the terminal has an azobenzene group; preparing the rhodamine fluorescent probe capable of detecting metal mercury ions and having a relatively low detection limit. By utilizing subjective-objective clathration action of azobenzene and cyclodextrin and taking the cyclodextrin magnetic nanoparticles prepared in advance as an adsorbent, the clathrated fluorescent probe and the detected metal ions can be separated from a solution under the action of an external magnetic field; furthermore, by utilizing the photoreaction property of the azobenzene group, the removal of heavy metal ions and the repeated use of the cyclodextrin magnetic nanoparticles can be realized. The rhodamine derivative has relatively good identification capability to mercury ions in the aqueous solution, thus being used as a mercury ion detection and removal agent. As the fluorescent probe, the rhodamine derivative can be widely applied to the fields of environmental engineering, analysis and detection and the like.

Subject to be Solved The invention aims to provide a polyamic acid-type photo-alignment layer in a heating process only below approximately 140° C., and to provide an optically anisotropic substance in which various polymerizable liquid crystal compositions are uniformly oriented by use of the layer.

Means for Solving the Subject An optically anisotropic substance obtained by applying a polyamic acid varnish which is a composition including a polyamic acid having a divalent azobenzene group in the principal chain or its derivative, or a composition including a mixture of both this polyamic acid or its derivative and other polyamic acids or its derivative as a polymer component, to a supporting substrate, by drying the resultant layer at a temperature range of approximately 50° C. to approximately 140° C., by carrying out alignment treatment by irradiation of the layer with light, applying a polymerizable liquid crystal composition to a alignment layer formed by means of the treatment, and polymerizing the composition.

The invention relates to a benzotriazole dye compound which is characterized by being represented by the chemical general formula in the specifications, wherein in the structural formula (I), R represents OH and OCH3. A synthesis method of the compound comprises the following steps of: (1) synthesizing 2-(2-nitro)azobenzene-4-formaldehyde-phenol; (2) synthesizing 2-(2-hydroxyl-5-formaldehyde)-2H-benzotriazole; (3) synthesizing 2-(2-methoxy-5-formaldehyde)-2H-benzotriazole; and (4) synthesizing a benzotriazole derivative. In the invention, benzotriazole is chemically modified, so that the absorption wavelength of benzotriazole is extended to more than 400nm. The benzotriazole can be used as a visible light photosensitizer and a photoinitiator or other assistants to form a photosensitive system to be used for visible light polymerization of an allyl monomer, and can also be used a photocuring material.