136 results about "Terphenyl" patented technology

The invention relates to a crown ether covalent organic framework material as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving a crown ether monomer and an amino monomer in an o-dichlorobenzene solvent, adding a catalyst acetic acid aqueous solution, and uniformly dispersing to form a reaction solution; the method comprises the following steps: freezing a reaction solution through a liquid nitrogen bath, vacuumizing, filling nitrogen, carrying out a heating reaction, and carrying out post-treatment operations such as washing and drying on a reaction product, so as to obtain the crown ether covalent organic framework material BADT-DB18C6-COF. The crown ether covalent organic framework material is formed by condensation of a crown ether aldehyde monomer and an amino monomer, the crown ether monomer is 4, 4 ', 4' ', 4 '''-(6, 7, 9, 10, 17, 18, 20, 21-octahydrodibenzo [B, K] [1, 4, 7, 10, 13, 16] hexaoxacyclo octadecene-2, 3, 13, 14-tetrayl) tetrabenzaldehyde, and the crown ether monomer is 4, 4 ', 4' ', 4'''-(6, 7, 9, 10, 17, 18, 20, 21-octahydrodibenzo [B, K] [1, 4, 7, 10, 13, 16] hexaoxacyclo octadecene-2, 3, 13, 14-tetrayl) tetrabenzaldehyde. The amino monomer is 4 ', 5'-bis (4-aminophenyl)-[1, 1 ': 2', 1 ''-terphenyl]-4, 4''-diamine. The crown ether covalent organic framework material BADT-DB18C6-COF prepared by the invention is mainly used as an adsorbent, is used for adsorbing and recovering uranium, thorium and americium ions from a solution, shows good adsorption capacity on radionuclides U-238, Th-232 and Am-243, and is particularly suitable for the field of spent fuel post-treatment in the nuclear industry.

The invention discloses a preparation method of a zwitterionic copolymer ultrafiltration membrane. The preparation method of the zwitterionic copolymer ultrafiltration membrane comprises the following steps: preparing a zwitterionic piperidine monomer; preparing a zwitterionic copolymer; and preparing the zwitterionic ultrafiltration membrane. The zwitterionic copolymer is synthesized by carrying out Friedel-Crafts copolycondensation on terphenyl, a piperidine monomer and a zwitterionic piperidine monomer in a specific proportion. The copolymer has high hydrophilicity and can be directly processed into an ultrafiltration membrane. The ultra-filtration membrane prepared by the preparation method disclosed by the invention is of a compact and interconnected spongy porous structure; the amphoteric ion copolymer membrane prepared by the preparation method can efficiently separate pollutants, shows excellent antifouling performance, can be repeatedly used, solves the problems of poor antifouling capability, low filtering efficiency, short service life and the like of the traditional ultrafiltration membrane, paves a way for directly manufacturing the amphoteric ion copolymer membrane, and provides an effective way for promoting the practical application of the high-performance anti-pollution membrane in a water treatment system.

The invention relates to a preparation method of a solid-phase free radical cross-linking enhanced anion exchange membrane, and belongs to the field of electrolyzed water. The preparation method comprises the following steps: (1) preparing allyl grafted poly-p-terphenyl piperidyl ion exchange resin; and (2) a solid-phase free radical crosslinking method and a preparation method of the enhanced anion exchange membrane. The reinforcing means provided by the invention is efficient and convenient, solves the membrane forming problem caused by poor solubility of the traditional cross-linked resin, and accurately strengthens multiple mechanical properties of the cross-linked anion exchange membrane. The prepared cross-linked anion exchange membrane has good dimensional stability, mechanical tensile property and electrolytic property, and has further industrial application prospects.

This invention in one aspect relates to a method of synthesizing a self-assembled mixed-dimensional heterostructure including 2D metallic borophene and 1D semiconducting armchair-oriented graphene nanoribbons (aGNRs). The method includes depositing boron on a substrate to grow borophene thereon at a substrate temperature in an ultrahigh vacuum (UHV) chamber; sequentially depositing 4,4″-dibromo-p-terphenyl on the borophene grown substrate at room temperature in the UHV chamber to form a composite structure; and controlling multi-step on-surface coupling reactions of the composite structure to self-assemble a borophene / graphene nanoribbon mixed-dimensional heterostructure. The borophene / aGNR lateral heterointerfaces are structurally and electronically abrupt, thus demonstrating atomically well-defined metal-semiconductor heterojunctions.

This application relates to a terphenylamine skeleton compound, its preparation method, and its application, belonging to the field of chemical synthesis technology. The preparation method of the terphenylamine skeleton compound of this application includes the following steps: dissolving 2,4,6-triphenylaniline with thiazole-4-carboxaldehyde or thiophene-3-carboxaldehyde in a solvent, conducting a reductive amination reaction under reducing agent conditions, quenching, extraction, washing, concentration to remove solvent, and purification to obtain the terphenylamine skeleton compound. This application provides a simple and mild synthetic method for the natural active products 5'-phenyl-N-(thiazol-4-ylmethyl)-[1,1':3',1''-terphenyl]-2'-amine and 5'-phenyl-N-(thiophene-3-ylmethyl)-[1,1':3',1''-terphenyl]-2'-amine, which can only be extracted from the secondary metabolites of the marine fungus Aspergillus sp. Furthermore, this method utilizes widely available raw materials, which is beneficial for large-scale industrial production of these natural active products.

The invention discloses an ultra-microporous branched polyaryl piperidinyl anion exchange membrane material as well as a preparation method and application thereof, and relates to the field of anion exchange membrane materials for producing hydrogen by electrolyzing water. According to the ultra-microporous branched polyaryl piperidinyl anion exchange membrane material, a four-functionality branching agent with a structure shown in a formula I is introduced into a polymer structural unit of polyterphenyl piperidone, and a polyaryl piperidinyl compound with a four-branch norbornene bis-benzocyclobutane structure is formed. By adopting the technical scheme, the structural rigidity of a polymer skeleton is improved, the formation of a large number of ultra-microporous structures is promoted, the ionic conductivity of the membrane material is effectively improved, and meanwhile, the problem of relatively poor dimensional stability caused by excessive water absorption of the membrane material is solved; the prepared anion exchange membrane has a wide application prospect in the field of hydrogen production by water electrolysis.

The invention relates to a preparation method of a metal halide perovskite-coated three-dimensional cobalt porphyrin-based COFs (Covalent Organic Frameworks) composite material, which comprises the following steps: S1, reacting an aldehyde precursor with an amine precursor in a first organic solvent, and after the reaction is finished, performing post-treatment to obtain a three-dimensional cobalt porphyrin-based COFs material; wherein the aldehyde precursor is 5 ', 5 '', 5'' '', 5'' ''''-(5, 10, 15, 20-tetrayl) tetra (([1, 1': 3 ', 1 ''-terphenyl]-4, 4''-diformyl))-21H, 23H-cobalt porphyrin (II), and the amine precursor is 4, 4'-diamino terphenyl and 2 ', 5'-bis ((methylthio) methyl)-[1, 1 ': 4', 1 ''-biphenyl]-4, 4''-diamine; s2, in a second organic solvent, enabling the three-dimensional cobalt porphyrin-based COFs material to react with lead bromide, and after the reaction is finished, performing post-treatment to obtain a PbBr2 (at) 3D Co-COFs material; and S3, in a third organic solvent, carrying out a reaction on the PbBr2 (at) 3D Co-COFs material and methylamine bromide, and after the reaction is finished, carrying out post-treatment to obtain the metal halide perovskite (at) three-dimensional cobalt porphyrin-based COFs composite material. The preparation method has the advantage that the photocatalytic activity and stability are improved.

The present application relates to the field of basic organic chemistry synthesis, and particularly to a high-yield preparation method of o-terphenyl based on hydrogen participation; comprising the steps of preparing a catalyst mixed solution, preparing a reaction mixed solution, filling micro-pressure hydrogen, heating and hydrogenation coupling reaction, rough extraction through reduced pressure distillation, and recrystallization and drying; a pre-assembly reaction precursor is formed by a bidentate phosphine bidentate phosphine ligand and a supported palladium catalyst, and a coupling reaction occurs with diphenyl under the cooperation of micro-pressure hydrogen and an acidic cocatalyst; the present application does not need to use traditional halogenated aromatic hydrocarbons and organic metal reagents, solves the problems of isomer mixing and difficult separation and halogen residue affecting the performance of downstream optoelectronic materials, realizes the preparation of o-terphenyl, and simplifies the separation and purification process.

This invention discloses a colorless polyimide film with high fluorine content, high heat resistance, and low expansion, as well as its preparation method and applications. Specifically, a series of high-fluorine terphenyl dianhydride (structure I) and high-fluorine terphenyl diamine (structure II) are copolymerized (or homopolymerized), cast, and heat-treated to prepare CPI optical film materials with excellent properties. This type of CPI film exhibits excellent optical transparency, high glass transition temperature, high thermal decomposition temperature, low coefficient of thermal expansion, high mechanical properties, and low dielectric loss, making it highly suitable for applications in flexible displays, wearable devices, flexible batteries, and 5G high-frequency communications.

To provide a novel organic compound.SOLUTION: An organic compound herein is a triarylamine derivative, wherein one aryl group in the organic compound is an aryl group including a skeleton in which a naphthyl group is bonded to a naphthylene group. The other two aryl groups are each independently a phenyl group, a biphenyl group, or a terphenyl group. These groups may each have a substituent. As the substituent, an alkyl group having 1 to 6 carbon atoms or a cycloalkyl group having 3 to 6 carbon atoms can be selected.SELECTED DRAWING: None

Achieving the selective and reversible adsorption of CO2 from humid, low partial pressures streams such as the flue gas resulting from the combustion of natural gas in combined cycle power plants ( 4% CO2) is challenging due to the need for high thermal, oxidative, and hydrolytic stability as well as moderate regeneration conditions to reduce the energy of adsorption / desorption cycling. Appending cyclic primary, secondary diamines, exemplified by 2-(aminomethyl)piperidine (2-ampd), to the metal-organic frameworks Mg2(dobpdc) (dobpdc4- = 4,4-dioxidobiphenyl-3,3-dicarboxylate), Mg2(dotpdc) (dotpdc4- = 4,4"-dioxido-[1,1':4',1"-terphenyl]-3,3"dicarboxylate) or Mg2(pc-dobpdc) (pc-dobpdc4-- = dioxidobiphenyl-4,4'-dicarboxylate) produces adsorbents of the classes EMM-44, EMM-45, and EMM-46, respectively, that display step-shaped adsorption of CO2 at the partial pressures required for 90% capture from natural gas flue gas at temperatures up to or exceeding 60 °C. Using a cyclic diamine in place of a diamine functionalized with bulky alkyl groups enables fast adsorption / desorption kinetics with sharp CO2 adsorption and desorption steps.

The invention relates to a preparation method of a high-performance imidazolyl polyionic liquid membrane, and belongs to the technical field of ionic membranes. The method comprises the following steps: by taking N-methyl pyrrolidone as a solvent, reacting 2-phenylbenzimidazole or 2, 4, 5-triphenylimidazole with 4, 4-difluorodiphenyl sulfone, 1, 4-dibromobenzene, 4, 4-dibromodiphenyl or 4, 4-dibromodiphenyl terphenyl in a hydrothermal reaction kettle, washing and drying to obtain a product I; under the catalysis of super organic acid, reacting the product I with biphenyl or p-terphenyl and N-methyl-4-piperidone, washing and drying; adding methyl iodide in an alkaline environment for reaction, and washing and drying to obtain polyion liquid; and dissolving in dimethyl sulfoxide, coating on a glass plate, and drying to prepare the film. The polyionic liquid membrane prepared by the method has more ionic sites, and the ionic conductivity is remarkably improved. Tests show that the stability of the membrane is almost unchanged after 1500 hours under the conditions of 80 DEG C and 1M KOH, the wet mechanical property reaches 60 MPa or above, and the membrane has high chemical and mechanical stability and wide application prospects.

The application belongs to the field of optical films, and particularly relates to a pyridine-containing terphenyl diamine, a colorless and transparent polyimide and a preparation method and application thereof. The structural formula of the pyridine-containing terphenyl diamine is shown as formula (1). The application adjusts the substituents on the diamine monomer and changes the methyl of the nitrogen atom para-position on the pyridine, designs six different pyridine-containing terphenyl diamines introduced into the polyimide, adjusts the charge transfer effect, intermolecular distance and folding degree of the molecular chain of the polyimide, and obtains the colorless and transparent polyimide film with heat resistance, good optical performance and tensile strength. The application has potential application value in the field of flexible devices.

The application relates to a ligand-regulated CuCe-MOF catalyst and a preparation method and application thereof in an electrocatalytic CO2 methane production reaction, and the preparation method comprises the following steps: mixing a Ce solution, an organic ligand solution and a structure directing agent to obtain a mixed solution; the organic ligand is terephthalic acid, 1,4-naphthalene dicarboxylic acid, diphenyl dicarboxylic acid or triphenyl dicarboxylic acid; the mixed solution is centrifuged and dried to obtain a cerium-based metal organic framework powder; the cerium-based metal organic framework powder is dispersed in a third solvent, ultrasonated, and soluble Cu salt is added, and after stirring, the third solvent is volatilized by heating to obtain the CuCe-MOF catalyst. The CuCe-MOF is prepared by using the organic ligand with a single benzene ring, a double benzene ring and a triple benzene ring, the dual synergistic optimization of ligand electronic effect and protonation efficiency is realized, the methane selectivity is greatly improved in the CO2 electro-reduction, and a brand-new synergistic regulation strategy is provided for the structural design and performance optimization of a CO2 RR electro-catalyst.

The present application relates to the technical field of porphyrin-based covalent organic framework material preparation, in particular to a mild preparation method of acetaldehyde-based porphyrin covalent organic framework and application thereof, which comprises the following steps: step one: dispersing ligand 2', 5'-bis((ethyl sulfide) methyl)-[1,1':4',1''-triphenyl]-4,4''-diamine in acetonitrile solution to obtain solution A, and dissolving acetaldehyde-based porphyrin in dichloromethane to obtain solution B; step two: mixing solution A and solution B; step three: adding ferric chloride and acetic acid as catalysts to react under mild conditions to obtain acetaldehyde-based porphyrin covalent organic framework material, which has excellent gaseous iodine adsorption performance. The synthesis method provided by the present application has mild conditions, simplifies the high-temperature time-consuming shortcomings of traditional porphyrin-based covalent organic framework material synthesis, and realizes the synthesis of special ligand covalent organic framework.

The invention provides a rare earth metal-organic framework material as well as a preparation method and application thereof, and relates to the technical field of fluorescence detection, the general formula of the material is {[Ln4 (THBA) 2 (H2O) 5]. 4H2O} n, Ln is Eu < 3 + > or Tb < 3 + > ions; tHBA is a deprotonated [1, 1 ', 4', 1 ''-terphenyl]-2 ', 3, 3', 5, 5 ', 5''-hexacarboxylic acid ligand; the material belongs to a triclinic system, the space group is P1, the material has a three-dimensional porous frame structure, and each Ln < 3 + > ion is in an eight-coordinate configuration; n > = 1, and n is an integer. The material not only shows high-sensitivity, high-selectivity and quick-response detectability to the harmful substance malachite green, but also successfully realizes conversion from a powder material to a portable device, and has wide application prospects in the fields of environmental monitoring, food safety, information encryption and the like.

The application discloses a kind of high-performance pure organic magnetic composite material and preparation method thereof, the composite material is poly (3-hexyl thiophene) as electron donor, using fullerene as electron acceptor, synthesis poly (3-hexyl thiophene) / fullerene composite charge transfer object.Then after 4" -n-pentyl-4-cyanotriphenyl subsequent doping, poly (3-hexyl thiophene) / fullerene / 4" -n-pentyl-4-cyanotriphenyl composite material.The method and material used in the application enhance the degree of charge transfer between pure organic composite material and solid state structure order, so that composite material obtains high room temperature ferromagnetism and Curie temperature, overcome the shortcoming that organic magnetic material is unstable in performance in air, low Curie temperature.Through poly (3-hexyl thiophene), fullerene and 4" -n-pentyl-4-cyanotriphenyl three composite, provide a kind of simple operation, solid state structure packing order, good stability high magnetic pure organic component composite material preparation new method.

The invention relates to a nitrogen-rich acylhydrazone covalent organic framework material as well as a preparation method and application thereof, 5 '-(4-(hydrazinocarbonyl)-3-methoxyphenyl)-3, 3'-dimethoxy-[1, 1 ': 3', 1 '-terphenyl]-4, 4'-dicarboxylic acid dihydrazide, 1, 3, 5-tri (2-formyl pyridine-5-yl) benzene and 4, 4 ', 4' '-(1, 3, 5-triazine-2, 4, 6-triyl) tribenzaldehyde are used as construction units, and the nitrogen-rich acylhydrazone covalent organic framework material is prepared by a one-step method. The compound is synthesized by Schiff base reaction. The nitrogen-rich acylhydrazone covalent organic framework material disclosed by the invention has good chemical stability and can be used as a carrier to load palladium nanoparticles through metal coordination to obtain a composite material, and the composite material shows excellent catalytic activity and substrate universality in catalysis of Heck reaction; the method has potential application value in the fields of biological medicine, green chemistry and the like.

An object of one embodiment of the present invention is to provide a novel organic compound. The organic compound is a triarylamine derivative. The triarylamine derivative has an aryl group including a skeleton in which a naphthyl group is bonded to a naphthylene group. The other two aryl groups are each independently a phenyl group, a biphenyl group, or a terphenyl group. These groups may each have a substituent. As the substituent, an alkyl group having 1 to 6 carbon atoms or a cycloalkyl group having 3 to 6 carbon atoms can be selected.

The invention discloses a covalent organic framework material for purifying aluminum ions in a propiophenone production process and a preparation method of the covalent organic framework material, the two-dimensional covalent organic framework material with carboxyl is prepared from 2, 4, 6-trihydroxybenzene-1, 3, 5-tricarboxaldehyde (THBT) and 4, 4, 6-trihydroxybenzene-1, 3, 5-tricarboxaldehyde (THBT), and the two-dimensional covalent organic framework material with carboxyl is a covalent organic framework material with carboxyl. A two-dimensional covalent organic framework with a terphenyl and hydroxyl structure is formed by condensation of a 4, 4 '-diamino-[1, 1': 4 ', 1'-triphenyl]-2 ', 5'-diol (DMTPD) building unit, and then the two-dimensional covalent organic framework is modified by ethylene diamine tetraacetic acid dianhydride (EDTAD) to obtain the high-molecular polymer. The covalent organic framework material is high in crystallinity, rich in carboxyl, capable of being combined with aluminum ions in the propiophenone synthesis process, beneficial to adsorption separation of the aluminum ions and good in application prospect in the field of adsorption separation.

The invention discloses a hydrophilic heteroporous covalent organic framework, a preparation method thereof and application of the hydrophilic heteroporous covalent organic framework in photocatalytic degradation of organic pollutants, the hydrophilic heteroporous covalent organic framework is prepared from 4 ', 5'-bis (4-formylphenyl)-3 ', 6'-dimethoxy-[1, 1 ': 2', 1 ''-terphenyl]-4, 4 ''-dicarboxaldehyde and 4, 4 '-(benzo [c] [1, 2, 5] thiadiazole-4, 4' '-dicarboxaldehyde, and the hydrophilic heteroporous covalent organic framework is prepared through a hydrothermal method. 2, 7-diyl) diphenylamine is used as a raw material and is subjected to a condensation reaction. The hydrophilic heteroporous covalent organic framework has the advantages of high catalytic activity, stable physical and chemical properties, good mass transfer effect, multiple active sites and the like, can be widely applied to photocatalytic degradation of organic pollutants in a water body as a novel photocatalyst with excellent performance, can realize efficient removal of the organic pollutants in the water body, and has wide application prospects. The application value is high, the application prospect is good, and the method has important significance on effective treatment of organic pollutant wastewater.

The invention discloses a method and a system for preparing hydrogenated terphenyl. The method comprises the following steps: (1) carrying out hydroalkylation reaction on reaction benzene and hydrogen; (2) the hydroalkylation product and the raw material benzene are subjected to normal pressure rectification together, a light component material flow, a benzene-containing material flow and a heavy component material flow are obtained, and the benzene-containing material flow partially or completely enters the step (1) to serve as the reaction benzene; (3) carrying out reduced pressure rectification on the heavy component material flow to obtain a material flow containing cyclohexylbenzene and hydrogenated terphenyl; and (4) mixing the cyclohexylbenzene-containing material flow with diisopropylbenzene, carrying out a transalkylation reaction to obtain a transalkylation product, and recycling the transalkylation product back to the normal-pressure rectification in the step (2). According to the method, hydroalkylation and transalkylation reaction are combined, and normal-pressure rectification and reduced-pressure rectification are combined, so that hydrogenated terphenyl is obtained; wherein a composite mode of the atmospheric tower and the vacuum tower greatly reduces the operation difficulty of the device and improves the separation efficiency.

The invention discloses a preparation method of a morphology-controllable Zr-MOF nano material, which comprises the following steps: dissolving zircon salt and formic acid in an organic solvent, heating to form a salt solution, dissolving an organic ligand 4 '', 4'' '', 4'' '', 4'' ''''-(ethylene-1, 1, 2, 2-tetrayl) tetra (([1, 1 ': 4', 1 ''-terphenyl]-4-carboxylic acid)) in the organic solvent to form an organic ligand solution; and adding the organic ligand solution into the salt solution while stirring, reacting to obtain a mixed solution, transferring the mixed solution into a reaction kettle, heating, reacting, cleaning precipitates by using an organic solvent, and drying in a dark place to obtain the Zr-MOF nano material. The invention discloses application of a Zr-MOF nano-material in an aqueous zinc-iodine battery. The Zr-MOF nano-material and iodine are mixed and ground and then heated to react to prepare an I2-coated Zr-MOF composite material, and then the I2-coated Zr-MOF composite material is prepared into electrode slurry. Solid or hollow Zr-MOF nano materials with different morphologies can be obtained by adjusting the heating reaction temperature, and the obtained hollow Zr-MOF nano material is used as an iodine positive electrode host material, so that the rate capability of an aqueous zinc-iodine battery can be improved.

The application provides an aromatic proton exchange membrane with a regional double sulfonic acid side chain structure and a preparation method thereof, and belongs to the technical field of proton exchange membranes. Triphenyl, 2,2,2-trifluoroacetophenone and 2,3,4,5,6-pentafluorobenzaldehyde are selected as monomers, an aromatic polymer is obtained through a super acid polymerization method, then 2-naphthol-6,8-disulfonic acid dipotassium hydrate is added, and a double solvent method is used to successfully realize the positioning controllable sulfonation of the side chain phenyl of the polymer. The main chain of the polymer is an ether-free aromatic skeleton, which guarantees good chemical stability from the source; the flexible regional double sulfonic acid side chain is beneficial to the induction of the formation of a continuous proton transmission channel, so that excellent proton conductivity is realized; meanwhile, due to the phenyl stacking effect of the naphthyl structure of the side chain, the proton membrane has excellent dimensional stability; the application gives a solution to the contradiction that the general aromatic proton exchange membrane is difficult to be compatible with the proton conductivity and the dimensional stability.

The utility model relates to the technical field of viscosity testing equipment, in particular to a hydrogenated terphenyl heat-conducting oil cleaning agent viscosity testing device which comprises an operating platform and a testing mechanism, the testing mechanism comprises a detection unit, a working assembly and a clamping unit, the detection unit is fixedly connected with the working table, the working assembly comprises a base, a driving part, a driving gear, a driven gear, a rotating rod, a rotating disc and an auxiliary part, the base is fixedly connected with the working table, the driving part is fixedly connected with the base, and the driving gear is fixedly connected with the driving part; the driven gear is meshed with the driving gear, the rotating rod is fixedly connected with the driven gear, the rotating disc is fixedly connected with the rotating rod, the auxiliary part is fixedly connected with the rotating disc, and the clamping unit is slidably connected with the rotating disc, so that continuous testing operation on the viscosity of the cleaning agent can be realized, and the operation efficiency of testing the viscosity of the cleaning agent is effectively improved.

This invention discloses an oral frameshift peptide neoantigen vaccine, its preparation method, and its application, relating to the field of biomedical technology. The preparation method includes: 1) synthesizing a sea urchin-like metal-organic framework (MOF) via a hydrothermal method using zinc ions and 3,3''-dihydroxy-2',5'-dimethyl-[1,1':4',1''-terphenyl]-4,4''-dicarboxylic acid; 2) loading the sea urchin-like MOF with a frameshift peptide and a Toll-like receptor 9 agonist via electrostatic interactions and / or van der Waals forces to prepare the oral frameshift peptide neoantigen vaccine. This vaccine not only promotes antigen endocytosis and transcytosis via intestinal microfold cells by activating cyclin 42, but also alleviates immune tolerance mediated by the goblet cell-regulatory T cell immunosuppressive axis and activates specific CD8+. + T cells help prevent the development of Lynch syndrome-related colorectal cancer.

This application provides a vinylcarbazole-based anion exchange membrane, its preparation method, and its application, belonging to the field of anion separation membrane technology. The vinylcarbazole-based anion exchange membrane is prepared by copolymerization of vinylcarbazole, piperidinone, and terphenyl monomers, possessing a poly(vinylcarbazole-arylpiperidine) backbone structure. By controlling the content of vinylcarbazole monomer, this application can effectively regulate the interchain spacing of the polymer within the membrane and construct densely interconnected ion channels. Utilizing precise interchain spacing sieving, the Donnan repulsion effect, and the synergistic effect of charge-assisted hopping conduction at the nitrogen center of carbazole, this vinylcarbazole-based anion exchange membrane simultaneously achieves high proton flux and high metal ion rejection rate during diffusion dialysis. The membrane exhibits excellent performance in HCl / FeCl2 and H2SO4 / FeSO4 mixed acid / metal ion systems, and possesses good anti-swelling and durability, making it effective for the recovery of industrial waste acids, such as those used in metal processing.

This invention provides a photosensitive diamine monomer, a photosensitive polyimide precursor containing the monomer, a method for preparing thin film materials using the photosensitive polyimide precursor, and the application of this material in patterned hydrophilic surfaces and humidity sensor substrates. The photosensitive diamine monomer has a triphenyldiamine backbone, and its side chain contains o-nitrobenzyl ether photosensitive groups. When polyamic acid or polyimide materials prepared from this diamine monomer are irradiated with ultraviolet light, the o-nitrobenzyl ether groups in the side chain undergo a photolysis reaction to generate o-nitrosobenzaldehyde and release phenolic hydroxyl groups. The phenolic hydroxyl groups are covalently fixed on the polymer backbone, which significantly improves the hydrophilicity of the irradiated area. This material can be used to prepare patterned hydrophilic surfaces and has potential application prospects in fields such as the integrated design of humidity sensor substrates and humidity-sensitive materials.

The application relates to the technical field of acrylonitrile-butadiene-styrene, and discloses a preparation method of a high-temperature-resistant ABS material, wherein acrylonitrile-butadiene-styrene resin, carboxyl polyarylether sulfone, AN-PS-GMA copolymer and the like are mixed, melt extruded, water-cooled and cut into particles to obtain the high-temperature-resistant ABS material. The AN-PS-GMA copolymer plays the role of a reactive compatilizer, improves the compatibility between the carboxyl polyarylether sulfone and the ABS resin, and makes the ABS material show higher tensile strength and impact strength. The carboxyl polyarylether sulfone introduces the heat-resistant terphenyl structure into a molecular main chain, is favorable for improving the high-temperature-resistant performance of the ABS material, and after high-temperature heat treatment, the material still has higher tensile strength and impact strength. And the material shows lower surface resistivity and good antistatic performance.

The application provides a method for producing pyromellitic anhydride by a pyromellitic acid dehydration process and belongs to the technical field of organic compound synthesis. The method comprises the following steps: (1) dissolving pyromellitic acid in an organic solvent and heating and dehydrating; and (2) cooling and crystallizing and separating to obtain pyromellitic dianhydride. The organic solvent comprises diphenyl ether and hydrogenated terphenyl. The mixture of diphenyl ether and hydrogenated terphenyl is used in the application, the low-temperature operation window is expanded, and better PMDA yield and PMDA purity are obtained compared with the case of using diphenyl ether or hydrogenated terphenyl as the solvent, and the problems of easy formation of a viscous system, narrow temperature operation window and inconvenient operation during low-temperature crystallization in the prior art are solved.