667 results about "Biphenyl" patented technology

The invention discloses a phenanthridine-6-formaldehyde derivative and a preparation method and application thereof.The preparation method comprises the steps that 2, 4, 5, 6-tetra (9-carbazolyl)-isophthalonitrile serves as a photocatalyst, 1-azabicyclo [2.2. 2] octane serves as a hydrogen atom transfer catalyst, a biphenyl isocyanide compound, the photocatalyst, the hydrogen atom transfer catalyst and an alkali additive are jointly dissolved in 1, 3-dioxolane, the mixture is stirred to be uniform, and the phenanthridine-6-formaldehyde derivative is obtained. And carrying out free radical tandem cyclization and acid-catalyzed hydrolysis reaction to obtain the phenanthridine-6-formaldehyde derivative. The invention also provides a specific reaction equation. According to the developed synthesis method of the phenanthridine-6-formaldehyde derivative, the compound can be efficiently and conveniently prepared, the technical bottlenecks of harsh reaction conditions and tedious steps in a traditional process are successfully overcome, raw materials which are low in price and easy to obtain are adopted, operation is carried out under mild conditions, the synthesis method has the outstanding advantages of being high in yield, safe and simple to operate, environmentally friendly and the like, and the method is suitable for industrial production. Good industrial application potential is shown.

The invention provides a diketone biphenyl compound serving as a VAV1 degradation agent and application of the diketone biphenyl compound. Specifically provided are a compound represented by formula (I), a tautomer, a stereoisomer, a pharmaceutically acceptable salt or a prodrug thereof. The compound provided by the invention is good in drug effect and can be used for preparing drugs for treating or preventing VAV1 related diseases.

The invention discloses preparation of a nitrogen-rich ionic organic single crystal material and application of the nitrogen-rich ionic organic single crystal material in iodine adsorption, and belongs to the technical field of functional materials and radioactive pollutant treatment. The material is formed by self-assembly at room temperature through a solution method by taking biphenyl tetracarboxylic acid tetrabutylamine as an anion ligand and tetra (4-ethyl pyridine phenyl) ethylene bromide or tetra (4-imidazole phenyl) ethylene bromide as a cation ligand. The method is simple in preparation process, mild in condition and high in yield. The skeleton of the obtained material is rich in nitrogen sites and has a large cavity, the material shows extremely high adsorption capacity and rapid adsorption kinetics for iodine in a gas phase and a liquid phase, the maximum adsorption capacity of the material for iodine steam reaches up to 5.16 g / g, the retention rate of 95% or above can still be kept within 7 days after adsorption, and the material has good recycling performance. The material provides a novel and reliable solution for efficiently capturing and fixing radioactive iodine, and has a wide application prospect in the field of nuclear waste treatment.

The invention belongs to the technical field of membrane separation, and particularly relates to a polyamide composite membrane containing amino-carboxyl bifunctional COFs as well as a preparation method and application of the polyamide composite membrane. The preparation method comprises the following steps: by taking 1, 3, 5-tri (4-aminophenyl) benzene, 4, 4 '-diaminobiphenyl-2, 2'-dicarboxylic acid and 1, 3, 5-trialdehyde phloroglucinol as monomers, carrying out solvothermal reaction to prepare a bifunctional COFs material rich in amino groups and carboxyl groups at the same time; the preparation method comprises the following steps: dispersing a COFs material in a water phase containing polyamine, and carrying out interfacial polymerization on the water phase and an oil phase containing polyacyl chloride to prepare the composite membrane. COFs are firmly anchored in a polyamide network through a covalent reaction between amino and an acyl chloride monomer, so that the problems that the COFs are easy to fall off and non-uniform in dispersion are solved; the water flux is improved by regular pore channels of COFs, the membrane is endowed with strong hydrophilicity and electronegativity by carboxyl, the desalination rate and the pollution resistance are remarkably enhanced, and the COFs-based composite membrane has a wide application prospect in seawater desalination and high-salinity wastewater treatment.

The invention discloses a high-refractive-index photo-thermal dual-curing optical adhesive and a preparation method thereof, and belongs to the technical field of high polymer materials, and the preparation method comprises the following steps: S1, preparation of high-refractive-index resin: placing biphenyl-4, 4 '-dithiol in a nitrogen atmosphere reaction kettle, adding a free radical thermal initiator, heating to 180-200 DEG C, reacting for 1-2 hours, and cooling to room temperature to obtain the high-refractive-index resin; dropwise adding alkenyl resin under the protection of nitrogen, stirring, reacting for 1-2 hours after dropwise adding, and cooling to room temperature to obtain high-refractive-index resin; s2, preparation of the optical adhesive: mixing the alicyclic epoxy resin, the high-refractive-index resin, the toughened resin, the liquid epoxy resin, the cationic photoinitiator and the cationic thermal initiator, and uniformly stirring in a dark place to obtain the adhesive. The problems that a traditional optical adhesive is poor in optical performance stability and unbalanced in mechanical and optical performance are solved. The application potential of preparing the high-performance optical adhesive is realized.

The present invention relates to the early treatment, including pre-diagnosis treatment, of sepsis and acute inflammatory syndromes such as systemic inflammatory response syndrome (SIRS) by PLA2 and metalloprotease inhibitors to improve the performance of antibiotics and outcomes prior to and after confirmation of the diagnosis of sepsis and / or SIRS in a patient or subject. Additional embodiments include methods of treating sepsis, anthrax and severe acute respiratory syndrome coronavirus (SARS and SARS-CoV2) and related inflammatory syndromes and compositions, including pharmaceutical compositions and blood sample compositions. In further embodiments, the present invention is directed to embodiments which evidence that LY315920, LY333013 and related sPLA2 inhibitors are particularly effective COVID-19 / cytokine release syndrome therapeutics-prophylactics. In embodiments, the PLA2 inhibitor is varespladib (LY315920), methyl varespladib (LY333013), AZD2716-(R)-3-(5′-benzyl-2′-carbamoyl-[1,1′-biphenyl]-3-yl)-2-methylpropanoic acid—as a racemic mixture or separately, as the “R” enantiomer), compound 4 (3-(5′-benzyl-2′-carbamoyl-[1,1′-biphenyl]-3-yl)-propanoic acid) and LY433771 ((9-[(phenyl)methyl]-5-carbamoylcarbazol-4-yl) oxyacetic acid), a pharmaceutically acceptable salt thereof or a mixture thereof. In embodiments, the metalloprotease inhibitor is Prinomastat, Batimastat, marimastat or vorinostat dosed alone or in combination with preferred sPLA2 inhibitors for the treatment of infection, inflammatory and wound conditions arising from various causes. Methods and compositions for achieving accelerated treatment of wounds and burns, anthrax metalloprotease toxin (lethal factor) driven complications, ARDS, neo-natal and pediatric acute respiratory distress syndrome (neo-natal / pediatric ARDS), including meconium aspiration syndrome and other disease states and conditions are also disclosed.

The invention provides a synthesis method of a thioether ligand and a palladium-catalyzed 2-aryl indole compound, and designs an application of the biphenyl thioether ligand and a palladium catalyst in preparation of the 2-aryl indole compound. Indole and arylboronic acid are subjected to a reaction under the action of a palladium catalyst and a biphenyl sulfide ligand, and the structural formula of the biphenyl sulfide ligand is shown in the specification. Ar is phenyl, furyl, thienyl, naphthyl or phenyl substituted by one or more substituent groups; r1 is methyl, methoxyl, fluorine atom, chlorine atom, bromine atom or methyl ester group; r2 is the same or different and is methyl, ethyl, isopropyl, isobutyl, cyclohexyl, benzyl, n-butyl or n-hexyl; r3 is alkoxy, alkylthio, substituted amino or halogen; the palladium catalyst is a divalent palladium compound.

The application discloses a novel flexible printed circuit board and camera module prepared based on weldable low-temperature silver paste, and belongs to the technical field of electronic materials and devices. The conductor pattern in the flexible printed circuit board comprises a main circuit pattern and an auxiliary function structure formed by weldable low-temperature cured silver paste. The curing temperature of the weldable low-temperature silver paste is 87-103 DEG C. The silver paste comprises conductive fillers, a polymer resin system, ester solvents, a curing agent, a silane coupling agent, polyamide wax thixotropic agents, polysiloxane defoaming agents, modified carbon nanotubes, modified antimony tin oxide powder, modified ceramic fillers and low-stress modifiers. The polymer resin system comprises hydrogenated bisphenol A type epoxy resin, diphenyl type epoxy resin and polyacrylate-CTBN copolymer. The conductive fillers comprise silver-coated copper flaky powder, nano silver wire and low-temperature alloy powder. Through the synergistic effect of components and the innovative process, the comprehensive improvement of mechanical properties, conductive properties, high-frequency characteristics and welding reliability is realized under the premise of ultralow-temperature curing.

The invention discloses a submicron ultrathin self-supporting ion conduction membrane as well as a preparation method and application thereof. The polymer is obtained through reaction of organic polymer resin and a cross-linking agent, has a full-cross-linked structure, and does not have interface impedance between a separation layer and a supporting layer; the organic polymer resin is selected from a polybenzimidazole polymer; the cross-linking agent is selected from 4, 4 '-bis (chloromethyl) biphenyl and / or p-chloromethyl benzene. And a reaction-non-diffusion phase conversion method is adopted, and the part which is not crosslinked or has a relatively low crosslinking degree is dissolved after the reaction, so that the sub-micron ionic conduction membrane for the flow battery is prepared. The cross-linking reaction enables the accumulation of polymers to be tighter, the pore size of the membrane is reduced, the mutual mixing of active substances in the flow battery is slowed down, and the coulombic efficiency of the battery is improved; and meanwhile, the transmission path of ions in the membrane can be effectively shortened by reducing the membrane thickness, so that the voltage efficiency of the battery is improved.

The invention relates to the technical field of photosensitive coatings, and particularly discloses high-flexibility photosensitive solder resist ink and a preparation method thereof. The high-flexibility photosensitive solder resist ink provided by the invention comprises a main agent and a curing agent, the main agent comprises a growth straight chain carboxyl-containing resin solution; the growth straight-chain carboxyl-containing resin solution is prepared by carrying out ring-opening reaction on epoxy resin, introducing beta-(acryloyloxy) acid and then carrying out esterification reaction with acid anhydride; the curing agent comprises thermosetting resin and a toughening agent; the thermosetting resin comprises biphenyl epoxy resin, and the flexibilizer is aliphatic epoxy resin. The composite effect of the straight-chain carboxyl-containing resin solution, the specific thermosetting resin and the flexibilizer is improved, the flexibility of a liquid photosensitive solder resist ink curing film can be obviously improved, and meanwhile, the liquid photosensitive solder resist ink has good chemical gold resistance and soldering resistance and is particularly suitable for a flexible circuit board.

This invention relates to a 1,3,4-thiadiazole peptide deformylase inhibitor and its preparation and application. The structural formula is shown in formula (1): wherein, R 1 It is n-butyl or cyclopentylmethyl; R 2 The compounds are hydrogen-containing, straight-chain alkanes, cyclic alkanes, aromatic rings, substituted biphenyls, or heterocyclic rings. The 1,3,4-thiadiazole peptide deformylase inhibitors provided by this invention can effectively inhibit bacterial protein synthesis, thereby achieving sterilization. These compounds exhibit excellent inhibitory activity against Gram-positive drug-resistant bacteria, especially the clinically challenging methicillin-resistant Staphylococcus aureus (MRSA). In particular, some preferred compounds show inhibitory activity 4-8 times that of the control standards vancomycin and linezolid. The 1,3,4-thiadiazole peptide deformylase inhibitors provided by this invention also exhibit inhibitory activity against Gram-negative drug-resistant bacteria, especially against drug-resistant Acinetobacter baumannii, known as "superbugs," with an inhibitory activity reaching 0.5 μg / mL, far superior to vancomycin and linezolid.

Provided is a photocurable composition comprising: a compound A having a structure which is a biphenyl structure or a fluorene structure and to which a substituent represented by formula (1) and a substituent represented by formula (2) are both bonded; and a compound B having a polymerizable group. Also provided are a cured product obtained by curing the composition, a method for producing the cured product, a laminate comprising the cured product, a method for producing the laminate, a semiconductor device, a method for producing the semiconductor device, and a novel compound.

The present application relates to a biphenyl compound, and a pharmaceutical composition thereof and the use thereof. Specifically, provided is a biphenyl compound as represented by formula (I), which can be used in the preparation of a drug, particularly in the preparation of a drug for preventing and / or treating diseases or conditions caused by or associated with the dysregulation of lymphocyte development or activity. Each group in formula (I) is as defined in the description.

The application discloses a high-temperature-resistant power cable and a preparation method thereof. A copper conductor is twisted to form a core, and an insulating layer, a shielding layer and a protective layer are sequentially coated on the surface of the core to obtain the high-temperature-resistant power cable. The protective layer is a reinforced resin, and the reinforced resin comprises the following raw materials in parts by weight: 100-120 parts of functionalized polyethylene, 20-30 parts of modified filler, 0.5-0.8 parts of p-toluenesulfonic acid and 10-15 parts of 1,4-p-biphenyl boronic acid bis(pinacol) ester. The functionalized polyethylene and the modified filler form an organic-inorganic interpenetrating network under the action of the 1,4-p-biphenyl boronic acid bis(pinacol) ester. The modified filler can form a thermal barrier network in the whole matrix, effectively hinders the thermal motion of the polyethylene molecular chain, and the side chain of the functionalized polyethylene molecular chain contains a phenyl polysiloxane structure, which can increase the flexibility of the polyethylene chain segment. In combination with the formation of dynamic crosslinking, the high-temperature-resistant effect of the material is greatly improved.

The invention relates to the technical field of oxygen reduction catalysts, in particular to a transition metal-based triatomic oxygen reduction catalyst and a preparation method and application thereof. The invention relates to a preparation method of a transition metal-based triatomic oxygen reduction catalyst. The preparation method comprises the following steps: dispersing carbon nanotubes in a solvent to obtain a dispersion liquid; adding transition metal acetate, urea and 4, 4 '-dihydroxy [1, 1'-biphenyl]-3, 3 ', 5, 5'-tetracarboxaldehyde into the dispersion liquid, performing ultrasonic treatment to obtain mixed liquid, and then performing heating reaction in an inert atmosphere; and after the reaction is finished, naturally cooling to room temperature, filtering, washing and drying to obtain the transition metal-based triatomic oxygen reduction catalyst. The catalyst designed by the invention not only has an efficient catalytic active site, but also remarkably improves the material transmission efficiency and enhances the utilization rate of a catalytic active center by optimizing the structure of a composite material, so that the synergistic enhancement of the electro-catalytic performance is realized.

The present invention provides a polyimide film and a method for manufacturing the polyimide film, wherein the polyamic acid solution is obtained by imidizing a dianhydric acid component comprising two or more selected from the group consisting of benzophenone tetracarboxylic dianhydride (BTDA), biphenyltetracarboxylic dianhydride (BPDA), and pyromellitic dianhydride (PMDA), and a diamine component comprising paraphenylene diamine (PPD), wherein, based on a total content of 100 mol% of the diamine component, the content of paraphenylene diamine is 70 mol% or more and 100 mol% or less, and based on a total content of 100 mol% of the dianhydric acid component, the content of biphenyltetracarboxylic dianhydride is 50 mol% or more and less than 100 mol%, the dielectric loss rate (Df) is 0.003 or less, and the light transmittance at a wavelength of 550 nm is 15% or more and 50% or less.

The invention discloses a biphenyl furnace, and belongs to the technical field of biphenyl furnaces. Comprising a biphenyl furnace body, a dual-mode waste heat feedback mechanism and an enhanced heating assembly. A U-shaped heating tube bundle is arranged in the bottom of the biphenyl furnace body; the dual-mode waste heat feedback mechanism is connected with the heating medium outlet and distributes the heating medium through the flow distribution valve group; the intensified heating assembly comprises a heating jacket attached to the bottom of the furnace barrel. According to the biphenyl furnace, the heat medium which is not completely cooled is introduced into the heating jacket or the external heat energy recovery device through the flow distribution valve group, sensible heat is recovered, meanwhile, stepped auxiliary heating is conducted on the dead zone of the furnace bottom, a cold flow layer is eliminated, and the temperature rising rate is increased. Besides, the heating jacket is fixed by adopting an elastic anchoring structure with built-in guide and external suspension, and thermal expansion displacement is compensated by utilizing the pre-tightening force of a spring, so that the problem of stripping failure of a bottom thermal insulation layer is effectively solved, and double improvement of deep utilization of energy and safe operation of equipment is realized.

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.

A dichroic bis-azo biphenyl dye of the following formula:The substituents R1, R2, R3, R4 are alkyl (CnH2n+1) or alkenyl (CnH2n−1) groups with n=1-18. At least one substituent among R1R2R3R4 is different from the other substituents. A benzidine-free method of making a dichroic bis-azo biphenyl dye is provided in which the biphenyl portion of the dye is formed from different first and second mono-azo dyes by a cross-coupling reaction, which may be a Suzuki reaction. A polarizer is formed from a photoaligned layer of the bis-azo biphenyl dye on a substrate and exhibits a dichroic ratio of at least 40. Chemical modification of the photoaligned bis-azo biphenyl dye layer creates a broad-band thin film polarizer with low light scattering and high thermal and photo tolerances.

The application relates to the technical field of fine chemical industry, in particular to a circulating reaction device and a method for preparing sodium 3,3',4,4'-biphenyltetracarboxylate by using the same. The circulating reaction device comprises: a batching kettle, a discharging pipeline and a circulating pipeline are arranged on the batching kettle; a reaction unit, an inlet pipeline and an outlet pipeline are arranged on the reaction unit; the inlet pipeline is communicated with the discharging pipeline; the outlet pipeline is communicated with the circulating pipeline; a filler area is arranged in the reaction unit; the fillers of the filler area at least comprise a catalyst; a pump is arranged on the inlet pipeline; a qualified reaction liquid kettle, a qualified liquid inlet pipeline is arranged on the qualified reaction liquid kettle, and the qualified liquid inlet pipeline is communicated with the outlet pipeline; a washing liquid kettle, a washing liquid first pipeline and a washing liquid second pipeline are arranged on the washing liquid kettle, the washing liquid first pipeline is communicated with the outlet pipeline, the inlet pipeline is communicated with the washing liquid second pipeline, and the washing liquid kettle is used for containing washing liquid for washing the catalyst. The application can effectively improve the reaction conversion rate, realize automatic production and improve the production efficiency.

The invention discloses a method for recycling and reusing a light byproduct of biphenyl alcohol monochloride, and relates to the technical field of organic matter recycling, and the method comprises the following steps: firstly, adsorbing and purifying a fraction generated by rectifying 3-chloro-2-methyl biphenyl in a biphenyl alcohol synthesis process by using specifically prepared modified activated carbon; the modified activated carbon is prepared through deep activation, silicon dioxide network construction and stearoyl chloride hydrophobization treatment, impurities can be efficiently removed, and self hydrophobicity is stable. And carrying out catalytic hydrogenation on the purified material in a hydrogenation reactor under the action of the modified activated carbon supported ruthenium-palladium bimetallic catalyst. The reaction product is subjected to post-treatment and distillation, fractions are collected, and the high-value hydrogenated terphenyl heat-conducting oil can be recovered.

The invention discloses a high-load cobalt monatomic catalyst with a three-dimensional confinement structure as well as a preparation method and application of the high-load cobalt monatomic catalyst. A three-dimensional cyclodextrin-based covalent organic framework 3D-CD-COF, which is constructed by seven-(6-amino-6-deoxy)-beta-cyclodextrin (7ACD) and aromatic dicarboxaldehyde (terephthalaldehyde or 4, 4 '-biphenyl dicarboxaldehyde), is used as a carrier, multiple coordination sites are constructed through salicylaldehyde grafting, and high-loading anchoring of cobalt single atoms is realized; cobalt single atoms are uniformly dispersed in a three-dimensional intercommunicated pore channel in a CoN1O3 coordination form, the loading capacity reaches 13.0-14.0%, and a three-dimensional confinement structure can inhibit four-electron oxygen evolution side reaction. The catalyst has high hydrogen peroxide Faraday efficiency and high yield, compared with Co-CD without a three-dimensional confinement structure, the activity and selectivity are remarkably improved, and an efficient technical scheme is provided for electrochemical preparation of hydrogen peroxide.

The present invention relates to a novel crystalline form of a helicase-primase inhibitor compound, and to pharmaceutical compositions comprising the novel crystalline form, to methods of production of the novel crystalline form, to the crystalline form in medicine and for use in the treatment of herpes viral infections.

The invention discloses a preparation method and application of a pyrenyl imine covalent organic framework material, and belongs to the technical field of materials. The preparation method comprises the following steps: dissolving 4, 4 ', 4', 4 ''-(pyrene-1, 3, 6, 8-tetrayl) tetraphenylamine and 3, 3 '-dimethoxy-[1, 1'-biphenyl]-4, 4 '-diformaldehyde in an organic solvent, fully mixing, and adding a catalyst to obtain a mixed solution; and freezing the mixed solution with liquid nitrogen, exhausting air, removing oxygen, carrying out a heating reaction, obtaining a yellow precipitate after the reaction is finished, and carrying out filtering, washing and vacuum drying treatment to obtain the pyrenyl imine covalent organic framework material. Pyrenyl and imine bonds on the pyrenyl imine covalent organic framework material structure prepared by the invention can provide a large number of binding sites bound with iodine, and the pyrenyl imine covalent organic framework material has the advantages of high crystallinity, large specific surface area, strong stability and the like, and can be used as a solid adsorption material for effective iodine vapor adsorption.

The application relates to the technical field of CO2 capture, in particular to a CO2 adsorbent and a preparation method and application thereof. The preparation method of the CO2 adsorbent comprises the following steps: impregnating a carrier with an impregnation solution; wherein the impregnation solution comprises an organic amine and an aromatic hydrocarbon polycyclic epoxide compound, the aromatic hydrocarbon polycyclic epoxide compound comprises at least two epoxy functional groups, the aromatic hydrocarbon polycyclic epoxide compound further comprises at least one of benzene rings, biphenyl rings and naphthalene rings, and the carrier has pores; and heating and cross-linking; the organic amine and the aromatic hydrocarbon polycyclic epoxide compound are cross-linked in the pores of the carrier to form a network structure, and the CO2 adsorbent is obtained. The organic amine in the CO2 adsorbent has a network structure, the anti-leaching performance and stability of the network structure organic amine are improved, and the stability of the CO2 adsorbent is enhanced.

The application belongs to the technical field of sand consolidation agent preparation, and particularly relates to a sand consolidation agent and a preparation method thereof. The sand consolidation agent is composed of component A and component B. The component A is composed of the following raw materials: a diphenyl phenolic epoxy resin, hexakis(4-hydroxymethylphenoxy)cyclotriphosphazene, modified nano calcium zirconate, cage octakis(aminophenyl)silsesquioxane, n-butyl glycidyl ether, KH-550 silane coupling agent, polyether amine, fumed silica and defoaming agent. The component B is composed of the following raw materials: polyborosilazane and 2-ethyl-4-methyl imidazole. The cage octakis(aminophenyl)silsesquioxane in the raw material of the sand consolidation agent strengthens the network structure stability through chemical bonding, the hexakis(4-hydroxymethylphenoxy)cyclotriphosphazene realizes thermal stabilization through chemical bonding and physical dispersion, and the modified nano calcium zirconate provides physical support. The three components synergistically improve the heat resistance of the system.

The invention discloses a circularly polarized light-emitting supramolecular self-assembly crystalline material as well as a preparation method and application of the circularly polarized light-emitting supramolecular self-assembly crystalline material. The supramolecular assembly crystalline material comprises a three-dimensional structure, and the three-dimensional structure is connected through a hydrogen bond formed between a hydrogen atom in a chiral secondary structure unit and an oxygen atom in a sulfonic acid group of 4, 4 '-bis (2-sulfostyryl) biphenyl disodium CBS. The crystalline material disclosed by the invention shows excellent chiral optical properties, good solvent stability and a remarkable luminous asymmetric factor; the circularly polarized light-emitting film material prepared from the material can effectively realize transmission and amplification of crystal optical performance.

A polyamide acid according to the present invention includes a tetracarboxylic acid dianhydride residue and a diamine residue. The tetracarboxylic acid dianhydride residue includes a 3,3',4,4'- biphenyltetracarboxylic acid dianhydride residue. The diamine residue includes a p-phenylenediamine residue and a siloxane diamine residue. At least one of the tetracarboxylic acid dianhydride residue and the diamine residue further includes a residue derived from a compound in which a plurality of aromatic rings are linked via a linking group. The linking group is one or more items selected from the group consisting of ether groups and ester groups.

The invention discloses a medical silica gel sealing ring material and a preparation method thereof, and relates to the field of silica gel materials. When the medical silica gel sealing ring material is prepared, mica powder, phytic acid, diglycidyl ether and allyl glycidyl ether are uniformly mixed and react to obtain modified mica powder; the preparation method comprises the following steps: reacting 4-(2-aminoethyl) phenylboronic acid with 3, 3 '-dihydroxy-[1, 1'-biphenyl]-4, 4 '-diformaldehyde to obtain a graft; the preparation method comprises the following steps: reacting vinyl silicone oil, thioglycerol and methacryloylethyl sulfobetaine to obtain modified silica gel; uniformly mixing the modified silica gel, the modified mica powder and the graft, and reacting to obtain the medical silica gel sealing ring material. The medical silica gel sealing ring material prepared by the invention has excellent flame-retardant, anti-aging, antifouling and mechanical properties.