245 results about "Poly(benzimidazole)" patented technology

The invention discloses a lithium ion battery composite diaphragm, a preparation method and a lithium ion battery, and relates to the technical field of lithium ion batteries. The lithium ion battery composite diaphragm comprises a base membrane and a functional coating arranged on the negative electrode side of the base membrane, the functional coating sequentially comprises an ion conducting layer, a thermal barrier layer and a self-repairing layer from the position close to the base film to the position far away from the base film; wherein the base membrane is a polyimide and aramid nanofiber blended electrostatic spinning membrane; the ion conducting layer comprises a compound of a modified fast ion conductor and polyvinylidene fluoride-hexafluoropropylene; the thermal barrier layer comprises a cross-linked network of boron nitride nanosheets and polybenzimidazole; the self-repairing layer comprises polyurethane microspheres loaded with dynamic disulfide bonds. The composite diaphragm provided by the invention can remarkably inhibit a purple area on the surface of a negative electrode, and enhance high-temperature self-protection and interface self-repairing of the lithium ion battery, so that the cycle and safety performance of the lithium ion battery are remarkably improved.

The invention discloses a polybenzimidazole modified ion exchange membrane as well as preparation and application thereof. The polybenzimidazole modified ion exchange membrane comprises a polybenzimidazole-containing porous base membrane, the surface of the porous base membrane is grafted with a sulfonic acid modified layer, and the outer surface of the sulfonic acid modified layer is coated with an aluminum fluoride layer. The preparation method of the membrane comprises the following steps: immersing a polybenzimidazole-based membrane into an ammonium acetate aqueous solution for reaction, taking out the base membrane after the reaction, and drying to obtain a pretreated base membrane; immersing the pretreated base membrane into a sulfonic acid group grafting solution, heating for reaction, cleaning the base membrane after the reaction, and drying to obtain a sulfonic acid modified base membrane; and immersing the sulfonic acid modified base membrane into an ethanol solution of aluminum fluoride for reaction, taking out the membrane after the reaction, cleaning and drying to obtain the membrane. The membrane can be used for assembling a flow battery. According to the invention, the problem that a sulfonic acid modified layer is incompatible with metal fluoride is overcome, and a proper combination of a sulfonating agent and metal fluoride is screened, so that the high-performance ion exchange membrane which can be used for a flow battery is successfully obtained.

The invention relates to the field of multifunctional coatings, in particular to a multifunctional coating based on acrylic resin and a production process of the multifunctional coating. Comprising the following raw materials in parts by weight: 40-60 parts of water-based acrylic resin emulsion, 0.3-0.6 part of a defoaming agent, 3-5 parts of modified nano hydroxyapatite, 0.3-0.5 part of a flatting agent, 2-5 parts of a dispersing agent, 1-3 parts of a curing agent, 3-5 parts of modified nano aluminum oxide and 30-50 parts of deionized water. The grafted chloroprene rubber can improve the interfacial compatibility of the nano-hydroxyapatite and a matrix and endows the coating with wear resistance, and after the nano-alumina is grafted with polybenzimidazole, a benzimidazole ring interacts with the matrix to enhance the interfacial compatibility of the nano-alumina and the matrix, so that the nano-alumina forms a high-temperature-resistant structure in the coating, and the wear resistance of the coating is improved. And the aromatic heterocyclic structure of the polybenzimidazole can endow the coating with higher thermal decomposition temperature, so that the coating has high temperature resistance.

The invention discloses a screen cloth enhanced polybenzimidazole porous membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: fully mixing polybenzimidazole, a polar solvent and a template to obtain a mixed solution, coating a base material with the mixed solution, placing a polymer mesh on the previous base material, and carrying out in-situ compounding, polar solvent removal and film formation to obtain a compact mesh reinforced polybenzimidazole film; and then carrying out in-situ etching treatment to prepare the screen cloth enhanced polybenzimidazole porous membrane. The size and connectivity of ion channels in the membrane can be regulated and controlled by regulating and controlling the type and content of templates in the membrane casting process, and the polybenzimidazole porous layer can be ultrathin by combining the effect of enhancing the mechanical property of the polymer mesh cloth, so that the mass transfer resistance of the polybenzimidazole porous separation layer is remarkably reduced, and the performance of the membrane is improved. The mesh-reinforced polybenzimidazole porous membrane has good dimensional stability and pore uniformity, and has the characteristics of high ion selectivity, high ion conductivity and high stability.

The invention relates to the technical field of high-molecular compounds, and discloses an epoxy resin material for a high-pressure conduit and a preparation method of the epoxy resin material. The preparation method comprises the following steps: preparing the following raw materials in parts by mass: 65-70 parts of bisphenol A epoxy resin; 55-60 parts of a curing agent; 0.1 to 0.2 part of an imidazole accelerant; 10 to 15 parts of a reactive diluent; and 8 to 15 parts of epoxy silicon dioxide. The diluent is prepared from N, N, N ', N'-tetraepoxypropyl-4, 4 '-diaminodiphenylmethane and ethylene glycol diglycidyl ether according to the mass ratio of 1 to (4 to 5); the curing agent comprises a polybenzimidazole curing agent, a polyethylene glycol curing agent and methyl tetrahydrophthalic anhydride in a mass ratio of (2-3): (2-3): (5-6). The epoxy resin material prepared by the invention has excellent electrical properties and mechanical properties.

The invention belongs to the technical field of waterproof and moisture permeable membrane materials, and particularly relates to a bio-based microporous membrane based on a template and a preparation method and application thereof, and the preparation method comprises the following steps: dispersing one of polybenzimidazole, aminated PI and carboxylated PBO and modified CNF into a DMF / water system; performing electrostatic spinning on the high-viscosity spinning solution; carrying out low-temperature vacuum drying treatment on the modified nanofiber self-supporting framework; coating and filling the bio-based polyurethane resin into the bio-based microporous membrane template, and carrying out negative pressure adsorption until the filling is uniform; and carrying out gradient drying on the bio-based wet membrane to obtain the bio-based microporous membrane. Compared with the prior art, the problems that in the prior art, the mechanical property or stability of bio-based polyurethane is insufficient, and a nanofiber reinforcing technology is difficult to combine with the bio-based polyurethane are solved. A nanofiber self-supporting framework with a stable structure is prepared through an electrostatic spinning technology, and then the nanofiber self-supporting framework is compounded with bio-based polyurethane to form a microporous membrane layer with waterproof and moisture permeable functions.

The invention discloses a preparation method of a vanadium battery electrolyte oxidation corrosion resistant composite membrane, which comprises the following steps: S1, uniformly dispersing graphene oxide nanosheets on the surface of an SPEEK (sulfonated polyether ether ketone) matrix by using sulfonated polyether ether ketone as a substrate to obtain an SPEEK / GO (graphene oxide) substrate; s2, treating the SPEEK / GO substrate in oxygen plasma treatment equipment, and ultrasonically cleaning the SPEEK / GO substrate with isopropanol for 10-20 minutes; s3, dissolving polybenzimidazole in N, N-dimethylacetamide (the concentration is 3-5wt%), and magnetically stirring until the polybenzimidazole is completely dissolved; the preparation method comprises the following steps: adding TiO2 nanoparticles (the particle size is 20-25nm, and the TiO2 nanoparticles are pretreated by a silane coupling agent KH-570) according to the mass ratio of 15-20%, ultrasonically dispersing and carrying out ice bath to obtain PBI-TiO2 dispersion liquid; s4, the SPEEK / GO substrate treated in the step S1 is vertically immersed in PBI-TiO2 dispersion liquid, the final coating thickness is 1.5 + / -0.2 [mu] m, and a pretreated film is obtained; and S5, carrying out hot pressing on the pretreated membrane by using a hot press, and then carrying out gradient cooling to room temperature to obtain the final composite membrane. The vanadium battery is better in vanadium resistance and corrosion resistance and suitable for high-power-density vanadium batteries.

The invention provides a preparation method of a fiber bragg grating humidity sensor based on a polyimide and MXene composite coating. The preparation method comprises the following steps: preparing a surface hydrophobic modification solution according to an MPTMS solution, a PAA aqueous solution and a nano SiO2 ethanol dispersion liquid; the method comprises the following steps: sequentially coating polybenzimidazole amic acid, MXene and polybenzimidazole amic acid on the surface of a gate region of the fiber bragg grating, so that a polybenzimidazole amic acid inner layer, an MXene middle layer and a polybenzimidazole amic acid outer layer are sequentially formed on the surface of the gate region from the surface to the outer layer; immersing the coated fiber bragg grating into a surface hydrophobic modification solution to carry out surface hydrophobic modification treatment on the outer layer of the polybenzimidazole amic acid; and carrying out annealing curing treatment on the fiber bragg grating subjected to surface hydrophobic modification treatment to obtain the fiber bragg grating humidity sensor based on the polyimide and MXene composite coating. According to the sandwich structure, through material function layering and interface optimization, collaborative improvement of sensitivity, response speed, stability and environmental adaptability is achieved.

The invention relates to the technical field of special polymer functional membranes, and discloses a polybenzimidazole gas separation membrane as well as a preparation method and application thereof, the polybenzimidazole gas separation membrane has an interpenetrating network-shaped pore structure, and the polybenzimidazole gas separation membrane has a nanoscale pore structure. The pore size distribution of the nanoscale pore structure is 0.1-30 nm, and the average pore size of the nanoscale pore structure is 1-80 nm. The polybenzimidazole gas separation membrane has an interpenetrating network-shaped pore structure and a nanoscale pore structure, so that the polybenzimidazole gas separation membrane has relatively high gas selectivity and permeability coefficient and also has relatively good mechanical properties.

The invention is applicable to the technical field of fuel cells, and provides a blending modified polybenzimidazole proton exchange membrane and a preparation method thereof, and the preparation method comprises the following steps: S1, preparing 4-methyl-N-toluenesulfonyl benzene sulfonamide; s2, preparing 4, 4 '-[imino bis (sulfonyl)] dibenzoic acid; s3, preparation of PSI: dissolving CBSI and a proper amount of anhydrous lithium chloride in a proper amount of a mixed solution of pyridine, triphenyl phosphite and pyrrolidone, adding diamino molecules after complete dissolution, heating and stirring the solution for 12 h, pouring the solution into methanol, filtering and collecting a product, washing with water, and drying to obtain the product PSI; and S4, preparing the PSI / OPBI blended membrane. The blended membrane prepared by the invention has excellent proton conductivity and good mechanical properties, and meets the performance requirements of the proton exchange membrane of the fuel cell; moreover, the raw materials are low in cost and easy to obtain, the synthesis conditions are mature, the yield is high, the feasibility is high, and the application prospect is wide.

The invention belongs to the technical field of high polymer materials, and particularly relates to a composite proton exchange membrane and a preparation method thereof. According to the prepared composite proton exchange membrane, the perfluorosulfonic acid resin capable of being industrially applied is selected as a base membrane material, and the modified polybenzimidazole polymer resin is added, so that the problem of high ion permeation rate of a perfluorosulfonic acid proton exchange membrane in the prior art is solved; interpenetration and permeation of the electrolyte in the use process of the perfluorosulfonic acid proton exchange membrane can be reduced, cross contamination of positive and negative electrolyte is greatly reduced, and the service life of the electrolyte is prolonged. The PBI is functionalized, so that the proton transmission capacity of the PBI is improved, and the proton exchange membrane formed by blending the functionalized PBI and the perfluorinated sulfonic acid resin can keep excellent vanadium resistance, excellent proton transmission capacity and relatively high ion selectivity at the same time. The preparation process is simple, and the prepared proton exchange membrane can meet the performance and long-term stability use requirements of a flow battery.

The invention relates to a preparation method of a modified nanocellulose lithium metal battery diaphragm, which comprises the following steps: by taking a natural degradable high polymer material cellulose as a matrix material, modifying polybenzimidazole by using polyethyleneimine by adopting an electrostatic self-assembly synergistic phase inversion method, and doping the modified polybenzimidazole into nanocellulose in a colloid particle manner, so as to obtain the modified nanocellulose lithium metal battery diaphragm. And carrying out vacuum filtration to prepare the polybenzimidazole / polyethyleneimine composite modified nano cellulose diaphragm. The method has the advantages that the filling of the colloid particles plays a role in supporting the fiber structure and improving the porosity. And polybenzimidazole is modified by polyethyleneimine, so that the transmission rate of lithium ions is improved. The process is simple and environment-friendly, and the obtained diaphragm shows good electrochemical performance when being applied to the lithium metal battery and has a wide application prospect in the field of the lithium metal battery.

The invention belongs to the technical field of fuel cell proton exchange membranes, and discloses a hydroxyl-containing modified polybenzimidazole proton exchange membrane and a preparation method thereof. According to the modified polybenzimidazole, a monomer (5-hydroxyisophthalic acid) containing a hydroxyl structure is added during polymerization of a raw material monomer, and the novel hydroxyl-containing modified polybenzimidazole is obtained through an imidazole forming reaction. The hydroxyl-containing modified polybenzimidazole can be prepared into the modified polybenzimidazole proton exchange membrane by using a solution casting method. According to the modified polybenzimidazole disclosed by the invention, stable doping of phosphoric acid in the membrane is facilitated by introducing hydroxyl and ether bonds, so that more proton carriers are kept under an anhydrous condition, the phosphoric acid doping rate of the prepared proton exchange membrane is further improved, and construction of a proton transmission channel is facilitated. The novel hydroxyl-containing modified polybenzimidazole proton exchange membrane has a good application prospect in the aspect of proton exchange membrane fuel cells.

The invention relates to the technical field of polyaryletherketone composite materials, in particular to a modified carbon fiber reinforced polyaryletherketone composite material and a preparation method thereof.The preparation method comprises the following steps that S1, polybenzimidazole is attached to the surface of phosphorus-containing group functionalized carbon fiber; s2, in a protective atmosphere, preheating polyaryletherketone in a mold pressing mold, then uniformly laying the phosphorus-containing group functionalized carbon fibers treated in the step S1 on a preheated polyaryletherketone material, and carrying out stepped mold pressing forming, so as to obtain the modified carbon fiber reinforced polyaryletherketone composite material. The interface shear strength of the carbon fiber reinforced polyaryletherketone composite material is greatly improved through the action of surface modification of the phosphoric acid on the carbon fiber and interface transition of the polybenzimidazole.

The invention discloses a preparation method of a branched polybenzimidazole side chain grafted monovalent / divalent high-selectivity cationic membrane, which is characterized in that a branched unit is introduced into a main chain to construct a microcavity structure based on the unique tight stacking and rich hydrogen bond network characteristics of polybenzimidazole (PBI), and the pore diameter in the membrane and the free volume of a polymer are regulated and controlled to prepare the branched polybenzimidazole side chain grafted monovalent / divalent high-selectivity cationic membrane. The stable and rapid transmission of monovalent ions is promoted, and a high interception effect on divalent ions is kept. Then molecules containing sulfonic acid groups and hydrophobic side chain molecules are grafted to the branched PBI, the ionic conduction performance is improved, meanwhile, a microphase separation structure can be constructed, the ionic transmembrane energy barrier difference is increased through the ionic hydration energy difference of monovalent and divalent ions, selective transmission of ions is achieved, and the ionic conductivity is improved. Finally, the ion separation membrane with outstanding stability and excellent comprehensive performance of selectivity and flux is obtained.

The invention relates to the technical field of lithium batteries, in particular to a lithium battery diaphragm containing aminated polybenzimidazole (at) halloysite nanotube composites (PyPBI (at) HNTs), a preparation method of the lithium battery diaphragm and a lithium battery, and the preparation method comprises four steps which are shown in Figure 1 in Figure 1 in Figure 1 in the specification. According to the invention, aminated polybenzimidazole (Py-NH2-PBI) and a halloysite nanotube (HNTs-Cl) with a halogen atom (Cl) on the surface are synthesized, and the Py-NH2-PBI is wrapped on the HNTs through a chemical reaction to form an organic-inorganic complex (PyPBI-HNTs) with a core-shell structure. The PyPBI-coated HNTs are uniformly dispersed in an OPBI matrix through a non-solvent phase transfer method (NIPS) to obtain the OPBI-coated Py-H composite diaphragm disclosed by the invention, and the problem that the compatibility of the HNTs and the diaphragm matrix OPBI is poor is solved. The diaphragm is rich in nitrogen element and has high affinity with electrolyte; compared with an OPBI coated HNTs diaphragm, the OPBI coated Py-H composite diaphragm has the advantages that the tensile strength (TS) and the ionic conductivity (sigma) are respectively improved by 30.96% and 21.82%, and the lithium dendrite inhibition effect is good; and the assembled lithium battery has high specific capacity and can safely and stably operate at 90 DEG C.

The invention discloses a preparation method and application of a metal-polymer hydrogen separation membrane with a sandwich structure, and relates to the technical field of hydrogen separation membrane preparation, and the preparation method specifically comprises the following steps: S1, preparing sulfonated polyetheretherketone of a pure proton conductor, and mixing with polybenzimidazole; s2, preparing a membrane casting solution; s3, preparing a pure proton conducting layer; s4, preparing a compact film; s5, preparing a Pt / C catalyst loaded metal-polymer compact layer; s6, preparing a composite film with a sandwich structure; s7, a Cu-Zn-Al2O3 catalyst and a Ni-CeO2 catalyst are prepared; and S8, preparing the metal-polymer hydrogen separation membrane with a sandwich structure. The metal-polymer hydrogen separation membrane provided by the invention has 100% selectivity to H2.

The present invention discloses a polybenzimidazole nanofiber membrane for use as a filter material for medical masks, as well as its preparation and modification methods. The polybenzimidazole nanofiber membrane is composed of cross-linked polybenzimidazole nanofibers, with the cross-links formed by polybenzimidazole bonding. The nanofiber membrane has a dumbbell-shaped pore size distribution. The preparation method comprises the following steps: preparing a spinning solution, preparing a bonding solution, preparing a nanofiber membrane layer, performing impregnation bonding, and post-processing. The polybenzimidazole nanofiber membrane obtained using the preparation method of the present invention has a tensile strength of 10 to 95 MPa and a filtration efficiency of 90% to 99.95% for particles ≥50 nm. It maintains its original stable structure and filtration performance after ultraviolet or dry heat sterilization, and maintains a filtration efficiency greater than 90% after 50 washes. It is reusable, has high economic and environmental benefits, and is simple to prepare, making it suitable for industrial production.

The invention relates to the technical field of all-vanadium redox flow batteries, in particular to a high-oxidation-resistance polybenzimidazole proton exchange membrane as well as a preparation method and application thereof. According to the proton exchange membrane, different polymeric monomers with high oxidation resistance are mixed in the reaction process to prepare a polybenzimidazole block copolymer, and after the membrane formed by the polybenzimidazole block copolymer is soaked in high-concentration acid liquor, rapid and selective conduction of protons is achieved. Aiming at the problems that in the application process of poly (2, 2 '-(p-oxybiphenyl)-5, 5'-benzimidazole) in an all-vanadium redox flow battery, a polymer skeleton is easily oxidized by VO < 2 + > ions, so that the battery capacity is attenuated, and the energy conversion efficiency is continuously reduced, the preparation method comprises the following steps: synthesizing a high-oxidation-resistance polybenzimidazole block copolymer main chain; the microphase separation structure of the polybenzimidazole block copolymer membrane can be effectively improved, a rapid ion channel is constructed in the polybenzimidazole block copolymer membrane, and meanwhile, the utilization rate of an acid solution is increased.

The invention relates to the field of fabric preparation, in particular to a cold-proof and oxygen-resistant fabric applied to extreme working conditions and a preparation method of the cold-proof and oxygen-resistant fabric. The fabric is formed by compounding a honeycomb base body outer layer, a middle buffer layer and a functional inner layer. The outer layer is hexagonal honeycomb grid base cloth formed by weaving basalt filaments and PTFE modified polyimide core-spun yarns, and composite colloid is injected for stepped curing; the middle layer is formed by sewing a silicon dioxide aerogel felt subjected to electrostatic spraying of paraffin microcapsules and a flame-retardant pre-oxidized fiber felt; and the inner layer is an oxygen adsorption layer formed by activating polyimide / flame-retardant viscose blended yarns and then grafting the activated polyimide / flame-retardant viscose blended yarns with a ZIF-8 material. All the layers are separated through polybenzimidazole membranes, and the composite fabric with excellent cold resistance, flame retardance, oxygen resistance and structural stability is finally obtained through gradient hot pressing, water-cooling shaping and surface flame-retardant coating treatment and is suitable for protective equipment in an extreme environment.

The invention belongs to the technical field of high polymer materials, and particularly relates to a proton exchange membrane as well as a preparation method and application thereof, and the preparation method of the proton exchange membrane comprises the step of blending functional resin and an additive to form a membrane, the functional resin comprises one or a combination of perfluorosulfonic acid resin, polybenzimidazole resin, polyether-ether-ketone resin, polyimide resin, polyether sulfone resin and polysulfone resin; the additive is sulfonated MXene; in percentage by mass, the ratio of the functional resin is 80 to 99.9 percent, and the ratio of the additive is 0.1 to 20 percent. The proton exchange membrane prepared by the invention has low ion permeability, high proton conductivity and excellent ion selectivity and mechanical property.

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 belongs to the technical field of energy storage, and discloses a covalent organic framework film with a sandwich structure as well as a preparation method and application of the covalent organic framework film. The preparation method comprises the following steps: carrying out condensation reaction on 2, 2 '-benzidine disulfonic acid and trialdehyde phloroglucinol to prepare a self-supporting covalent organic framework membrane, dip-coating the self-supporting covalent organic framework membrane in a polybenzimidazole solution, and carrying out phase inversion to prepare the covalent organic framework membrane with a sandwich structure. According to the invention, selective transfer of protons is realized by using a pore structure and a sulfonic acid group in the covalent organic framework, vanadium ion permeation is hindered, and meanwhile, in the battery assembly and operation process, the polybenzimidazole layers on the two sides play a role in protecting the covalent organic framework membrane. The prepared membrane has high proton selectivity and battery efficiency.

The present invention relates to the technical field of polybenzimidazoles. Disclosed are a polybenzimidazole, a polymer film, a preparation method, and a use. The polybenzimidazole of the present invention comprises a structural unit A1 and a structural unit A2 and optionally comprises a structural unit B1 and a structural unit B2, wherein the structural unit A1 has a structure represented by formula (A1), the structural unit A2 has a structure represented by formula (A2), the structural unit B1 has a structure represented by formula (B1), and the structural unit B2 has a structure represented by formula (B2). The polybenzimidazole of the present invention has relatively high light transmittance and relatively low haze, and the film has relatively high elongation at break.

The invention relates to the technical field of polybenzimidazole, and discloses polybenzimidazole and a proton exchange membrane as well as a preparation method and application of the polybenzimidazole and the proton exchange membrane. The polybenzimidazole comprises a structural unit A and a structural unit B, the structural unit A has a structure as shown in a formula (1), and the structural unit B has a structure as shown in a formula (2); wherein X1 is fluorine-containing alkylene,-O-,-SO2-or-CO-, X2 is a connecting bond,-O-,-SO2-or-CO-, and X1 is different from X2; r1 and R2 are the same or different, and are independently selected from any one of arylene, cycloalkylene, alkenylene, heteroalkylene and fluorine-containing alkylene. The polybenzimidazole provided by the invention has good mechanical properties and obviously higher proton conduction performance.

The invention firstly provides a phosphoric acid stable type high-temperature proton exchange membrane with amphiphilic polybenzimidazole and azide type ionic liquid, the ionic liquid in the composite membrane accounts for 30% by mass, and the prepared OHPBI-PIL-Px membrane exchanges anions into H2PO4 <-> through acid-base doping reaction, so that ion pairs are formed, and the proton exchange membrane has the advantages of high-temperature proton exchange, high-temperature proton exchange, high-temperature proton exchange and the like. The composite membrane constructs a proton transfer channel in a system, promotes proton transfer and transfer, provides alkaline quaternary ammonium sites, has strong acid-base interaction with PA, and can effectively reduce PA leakage. The long-term performance of the high-temperature proton exchange membrane can be enhanced. The invention further provides a preparation method of the stable high-temperature proton exchange membrane with the amphiphilic polybenzimidazole and azide ionic liquid phosphoric acid. The OHPBI-PIL-Px membrane is formed by crosslinking through an in-situ free radical polymerization method. The formed high-temperature proton exchange membrane is excellent in electrochemical performance and controllable in cost, has a production prospect and can be applied to the field of high-temperature proton exchange membrane fuel cells.

The invention discloses an electrostatic spinning coated protective diaphragm, which comprises a polytetrafluoroethylene base membrane and a bactericidal electrostatic spinning layer, the bactericidal electrostatic spinning layer is composed of polybenzimidazole, polyacrylic acid and a metal salt, and is obtained by electrostatic spinning and cross-linking agent treatment, the molar ratio of polybenzimidazole to polyacrylic acid is 1: 1, and the molar ratio of polybenzimidazole to polyacrylic acid is 1: 1. The aperture is gradually increased from the side, attached to the polytetrafluoroethylene base membrane, of the sterilization electrostatic spinning layer to the other side of the sterilization electrostatic spinning layer. The invention further discloses a preparation method of the electrostatic spinning coating protective diaphragm, the polyion liquid and the electrostatic spinning method are combined, and the preparation method is simple and easy to implement. The prepared electrostatic spinning fiber is used as an inner layer of a protective garment, can resist bacteria, inhibit bacterial organisms and prevent external foreign matters and bacteria from invading a human body, and has good killing and inhibiting effects on the bacteria and the bacterial organisms, and the diaphragm has a porous structure and aperture gradient and has good air permeability.

A temperature-resistant polymer composition comprising: a. poly-2,5-benzimidazole having an inherent viscosity (IV) between 1.0 dL / g and 2.5 dL / g; and b. at least one binder having a glass transition temperature lower than that of the poly-2,5-benzimidazole and having an inherent viscosity in the range of 0.2 dL / g and 1.5 dL / g, which is subjected to compression at a temperature in the range of 400 °C to 600 °C and a pressure in the range of 689,475.72 Pa (1000 psi) to 689,475.29 Pa (10000 psi), wherein the composition is characterized by: i. a glass transition temperature in the range of 150 to 480 °C; and ii. a ratio of poly-2,5-benzimidazole to binder in a range between 95:5 and 5:95.

This invention discloses a low-functionality photocurable resin and its preparation method, comprising: dissolving polybenzimidazole in a polar aprotic solvent in an inert gas atmosphere to obtain a polybenzimidazole solution; adding sodium hydride in a molar amount equal to 0.8–1.2 times the molar amount of the polybenzimidazole resin to the polybenzimidazole solution, reacting the mixture, then adding allyl bromide in a molar amount equal to 0.8–1.2 times the molar amount of the polybenzimidazole resin, reacting again to obtain a polybenzimidazole prepolymer; dissolving the polybenzimidazole prepolymer in a polar aprotic solvent, adding a crosslinking agent and a photoinitiator, and mixing to obtain a photocurable resin solution; irradiating the photocurable resin solution with ultraviolet light, and drying to obtain a photocurable resin with a functionality of 20%–44%. This invention features a low allyl content, allowing for the curing of aromatic resins with less crosslinking agent, and the cured resin exhibits excellent heat resistance and ultra-high mechanical strength.

The invention belongs to the technical field of flow batteries, and discloses a porous polybenzimidazole membrane, a preparation method thereof and a flow battery, the preparation method comprises the following steps: S1, carrying out nucleophilic substitution reaction on polybenzimidazole and a functional compound to obtain polybenzimidazole grafted with a functional side chain; s2, coating the casting film solution containing the polybenzimidazole grafted with the functional side chain to form a wet film; and S3, carrying out primary shaping on the wet film through pre-drying, and then carrying out heat treatment and pore forming to obtain the porous polybenzimidazole film, the porous polybenzimidazole membrane prepared by the preparation method provided by the invention has excellent conductivity, relatively high selectivity and good mechanical properties, and can fully meet the requirements of an ion conduction membrane for a flow battery.