48 results about "Azo polymer" patented technology

The invention belongs to the field of nanometer material preparation, and particularly discloses N-doped carbon spheres with lignin as the raw material and a preparing method and application thereof. The preparing method comprises the steps of dissolving alkali lignin in water, and then adding hydrogen peroxide for reaction to obtain demethoxy lignin reaction liquid; making aniline or aniline derivatives react with sodium nitrite to obtain diazonium salt reaction liquid; mixing the reaction liquid for reaction; adding dilute sulphuric acid for sedimentation, and conducting washing and drying to obtain a lignin-based azo polymer, dissolving the polymer in an organic solvent, and adding water to change the microfacies environment to obtain lignin azo polymer colloidal spheres; calcining the lignin azo polymer colloidal spheres under inert gas shielding, and conducting cooling to obtain the N-doped carbon spheres. The porous N-doped carbon spheres with uniform structure can be obtained through carbonization of the lignin azo polymer colloidal spheres, and the N-doped carbon spheres show excellent initial coulomb efficiency and long-term circulation stability when applied to a lithium ion battery negative electrode active material and are an environment-friendly reproducible nano electrode material.

The invention relates to light-responding methyl methacrylate azo polymer and a synthetic method thereof; azobenzene is dissolved in dichloromethane and is dropwise added at 0 DEG C into a system with methacrylic acid and a catalyst 4-dimethylamino-pyridine, and nitrogen is introduced to remove air in the system; a dewatering agent dicyclohexylcarbodiimide is dropwise added into the system and is reacted at 0 DEG C for 2-5 hours, and the temperature is raised to 25 DEG C for reacting for 12-24 hours to obtain an azo monomer with olefin group at one end; methyl methacrylate and an initiator AIBN (azodiisobutyronitrile) are added into a container, nitrogen is introduced to remove oxygen in the system, the azo monomer of step 1 is dropwise added into the system to enable reacting at 60-90 DEG C, and reacting is carried out for 3-8 hours to obtain the light-responding methyl methacrylate azo polymer. The preparation method is simple, the azo polymer material has good light response and high stability, and the synthetic method for the light-responding methyl methacrylate azo polymer is provided.

The invention belongs to the field of polymeric nanocomposite material synthesis, and relates to preparation and application of an amino-functionalized graphene oxide / azo polymer composite waveguide material. The preparation comprises the following steps: firstly preparing azo chromophore 4-(4-nitro-alkenyl)phenyl-1,3-diamine from paranitroaniline and m-phenylenediamine, and then preparing a isocyano-terinated azobenzene prepolymer from NAPD and IPDI in the presence of T-12; afterwards ultrasonically exfoliating graphite oxide to obtain graphene oxide dispersion liquid, and reacting with quadrol under the action of 2-(7-azo benzo triazole)-N, N, N minute, N minute-tetramethyluronium hexafluorophosphate, so as to obtain amino-functionalized graphene oxide; adding the carbimide radical blocked azobenzene prepolymer into EAGO, and performing vacuum drying. A thermo-optical coefficient (dn / dT) of the prepared amino-functionalized graphene oxide / azo polymer composite waveguide material is greater than that of a common organic material and is more than 10 times that of a traditional inorganic material, and the composite waveguide material can be applied to the development of novel digital thermal optical switches with low drive efficiency and higher response speed.

The invention discloses lignin-based amphiphilic azo-polymer colloidal spheres as well as a preparation method and application thereof. The preparation method comprises the following steps of: dissolving alkali lignin in a NaOH solution with pH of 8-14, dropwise adding a hydrogen peroxide solution with the mass concentration of 25%-35% under the condition of a 85-95 DEG C water bath, after reacting for 0.5-1.5 hours, and cooling to a room temperature to obtain the alkali lignin without methoxyl; preparing diazonium salt; mixing the alkali lignin without methoxyl with the diazonium salt, adding an alkalinity conditioning agent to adjust pH to 8-14, after reacting, adding an acidity conditioning agent to adjust pH of the solution to 1-4, so that products are acidified out and precipitated, washing precipitates by deionized water, after drying, taking out, dissolving the products in an organic solvent, and adding water serving as a precipitator to obtain the lignin-based amphiphilic azo-polymer colloidal spheres. The solid content of ceramic slurry prepared from the lignin-based amphiphilic azo-polymer colloidal spheres disclosed by the invention reaches up to 70.9wt%-73.1wt%, and is far higher than that of blank slurry; and compared with a conventional dispersion agent, the lignin-based amphiphilic azo-polymer colloidal spheres have a better dispersion effect.

The invention relates to a preparation method of antisotropic azo polymer / carbon tube composite thin film with photo-responsitivity. An azo polymer and a modified carbon tube composite film are prepared into a flexible polymer thin film with in plane anisotropy through synthesis of the azo polymer and modification of a carbon tube film; a flexible thin film with in-plane conducting anisotropy can be obtained through polymer molecular chains are orientated along a carbon tube under the induction of the carbon tube, and the conductivity in the in-plane horizontal direction is higher than that in the direction which is vertical to the carbon tube by one order of magnitude; under UV (Ultraviolet) irradiation, the conductivity of an azo polymer-carbon tube composite film is changed, and since azo molecules are in cis-trans isomerization under the UV irradiation and the molecular distance of a cis structure is reduced, higher conductivity is obtained; the conductivity of the azo polymer-carbon tube composite flexible thin film has good repeatability along with the change of irradiation, and good photo-responsitivity is expressed by the azo polymer-carbon tube composite flexible thin film; the antisotropic azo polymer / carbon tube composite thin film is expected to be applied to many fields of aerospace, organic photoelectric devices and the like.

The invention relates to a method for manufacturing optical waveguide by using an azobenzene polymer, and belongs to the technical field of optical device manufacturing. The method comprises the following steps: firstly, cleaning an underlayer; mixing an epoxy resin prepolymer, isocyanate and N,N-Dimethylformamide so as to obtain first blended solution, then spin-coating the first blended solution on the cleaned underlayer to obtain a lower cladding; mixing the azobenzene polymer, isocyanate and N,N-Dimethylformamide so as to obtain second blended solution, then spin-coating the second blended solution on the lower cladding to obtain a sandwich layer; placing a mask on the sandwich layer, irradiating the mask with a laser so as to form the optical waveguide; and coating a curing glue on an upper cladding of the optical waveguide. The method has the advantages of simple manufacturing process, easily controlled quality and low product cost.

The invention relates to a synthesis and modification method of a hyperbranched azo polymer, which uses azoresorcinol sulfonic acid and 4,4'-diphenylmethane diisocyanate (MDI) as raw materials and utilizes azo The hydroxyl group of quinone sulfonic acid, the sulfonic acid group and the isocyanate group in the MDI molecule are polycondensed under specific reaction conditions to form a hyperbranched azo polymer. During the reaction, the change of the absorbance of the system at a wavelength of 430nm is used to track the synthesis hyperbranch The reaction process of the azo polymer. The hydroxyl group on the periphery of the synthesized polymer molecule reacts with succinic anhydride / trimellitic anhydride to improve the solubility of the hyperbranched azo polymer; the maximum absorption peak of the π→π* transition of the synthesized hyperbranched azo polymer is 425? nm, trimellitic anhydride modified hyperbranched azo polymer is basically the same as the hyperbranched azo polymer π→π* transition maximum absorption peak, succinic anhydride modified hyperbranched azo polymer azo group π→π* transition is the largest Absorption peak from 425? nm? Redshifted to 501nm.

The invention discloses a main chain type azobenzene polymer and a preparation method thereof. According to the preparation method, the main chain type aromatic azo polymer is prepared by adopting nitro reduction coupling reaction for the first time. The preparation method comprises the following steps: firstly synthesizing different types of monomers through a series of reactions, namely conjugate monomers and non-conjugate monomers; secondly, synthesizing a photocatalyst required by a polymerization system, namely gold nanoparticles loaded on zirconium oxide, and characterizing the photocatalyst through a series of tests; and finally carrying out nitro reduction coupling reaction of the monomers in the presence of a methylbenzene-isopropanol mixed solvent and potassium hydroxide, thus obtaining the main chain type aromatic azo polymer. The preparation method disclosed by the invention needs few polymerization reaction components, is simple, practicable, convenient in a purification process, mild in reaction conditions and has the advantages of low toxicity, high efficiency and environmental protection. The main chain type aromatic azo polymer prepared by using the method has good solubility and functionality and high optical application value.

The invention relates to the field of optics, and provides an optical storage anti-fake element. The optical storage anti-fake element at least comprises a pattern layer, the pattern layer is provided with azo polymers, the azo polymers at least comprises one kind of azobenzene chromophore, the upper surface of the pattern layer is provided with a continuous or discontinuous concave-convex structure, and optical information which is erasable, capable of being read, written and changed, and capable of being read and identified by machines is written in the concave-convex structure. The optical storage anti-fake element has high anti-fake reliability.