292 results about "Poly(benzimidazole)" patented technology

The invention relates to the technical field of all-vanadium redox flow batteries, in particular to a sulfonated polybenzimidazole proton exchange membrane as well as a preparation method and application thereof. The proton exchange membrane structurally comprises a polybenzimidazole polymer main chain and a sulfonic acid group, the free volume of the polybenzimidazole polymer is regulated and controlled by synthesizing raw materials with different structures, and the polybenzimidazole proton exchange membrane is obtained by sulfonating the polybenzimidazole polymer. Aiming at the problems of cross permeation of vanadium ion electrolyte of a positive electrode and a negative electrode of the all-vanadium redox flow battery, capacity attenuation of the all-vanadium redox flow battery and low energy conversion efficiency, the preparation method comprises the following steps: constructing a polybenzimidazole polymer main chain by selecting raw materials with high rigidity and high free volume; the mechanical property of the polybenzimidazole membrane is improved while a rapid ion channel is constructed in the polymer membrane, and water molecules can be contained to limit swelling of a membrane material.

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 relates to a high-temperature proton exchange membrane, in particular to a high-temperature proton exchange membrane based on silica cross-linked polybenzimidazole and a preparation method of the high-temperature proton exchange membrane. The preparation method comprises the following steps: polymerizing 3, 3 '-diaminobenzidine, 4, 4'-diphenyl ether dicarboxylic acid and 5-hydroxyisophthalic acid to form a polybenzimidazole main chain containing an ether bond and a phenolic hydroxyl group, grafting a silane coupling agent on the polybenzimidazole main chain, and finally carrying out membrane formation and acid catalysis treatment to obtain the high-temperature proton exchange membrane based on silica crosslinked polybenzimidazole. A silicon-oxygen network structure is introduced into a polybenzimidazole main chain, so that the phosphoric acid retention rate and the oxidation resistance of the polymer film can be effectively improved, and the service life of the polymer film is prolonged.

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 provides a phosphoric acid doped polybenzimidazole high-temperature proton exchange membrane and a preparation method thereof. In the membrane material, the range of the mass fraction of the phosphoric acid in the polybenzimidazole polymer is greater than 0 wt.% and not greater than 3000 wt.%. The membrane is prepared by the following steps: S1, dissolving a polybenzimidazole polymer in a solvent, and adding phosphoric acid to obtain a composite solution; and S2, casting the composite solution onto a membrane forming container, and drying to obtain the phosphoric acid doped polybenzimidazole high-temperature proton exchange membrane. The phosphoric acid doped polybenzimidazole high-temperature proton exchange membrane not only can be used for preparing HT-PEM without internal stress so as to prevent loss of phosphoric acid, but also can be used for randomly and accurately controlling the phosphoric acid doping amount and thickness of the prepared membrane through the composition and volume of the solution; therefore, the phosphoric acid doped polybenzimidazole composite HT-PEM without internal stress, which has high stability and ultrahigh specific proton conductivity, is prepared.

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 discloses a modified polybenzimidazole blended polyvinylpyrrolidone high-temperature proton exchange membrane, a preparation method of the modified polybenzimidazole blended polyvinylpyrrolidone high-temperature proton exchange membrane, a membrane electrode and a fuel cell. The modified polybenzimidazole blended polyvinylpyrrolidone high-temperature proton exchange membrane comprises modified polybenzimidazole and polyvinylpyrrolidone, the mass ratio of the modified polybenzimidazole to the polyvinylpyrrolidone is (3 to 1): (1 to 2); the structure of the modified polybenzimidazole is # imgabs0 #, wherein the value range of n is 500 to 1000. According to the high-temperature proton exchange membrane provided by the invention, the proton conductivity is remarkably improved on the premise of ensuring the mechanical strength, and the high-temperature proton exchange membrane is expected to be applied to the field of high-temperature proton exchange membrane fuel cells on a large scale.

The invention discloses a multi-layer enhanced proton exchange membrane for a flow battery and a preparation method of the multi-layer enhanced proton exchange membrane, and belongs to the field of high polymer materials. Sulfonated polybenzimidazole serves as a middle reinforcing layer, fluorine-containing sulfonic acid resin serves as functional resin layers on the two sides, the reinforcing layers can be prevented from being corroded and degraded by electrolyte in a strong acid and alkali environment, the reinforcing material is prevented from being exposed, meanwhile, the porous reinforcing layer can be better combined with fluorine-containing sulfonic acid resin solutions on the two sides, and the service life of the composite material is prolonged. The resin solution is infiltrated into the porous layer, so that the swelling of the membrane is better limited; the thickness of the sulfonated polybenzimidazole porous enhancement layer accounts for 10%-40% of the thickness of the multi-layer enhanced proton exchange membrane, so that the transmission capacity, the strength performance and the dimensional stability of protons can be improved, and the comprehensive improvement of the sulfonic acid resin membrane in the aspects of ion permeation blocking, the dimensional change rate, the electric conductivity, the mechanical performance and the puncture resistance strength is realized.

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 relates to a preparation method of a high-temperature proton exchange membrane, in particular to a preparation method of a phosphoric acid / cystine functionalized MXene / polybenzimidazole composite high-temperature proton exchange membrane for a high-temperature fuel cell. The invention aims to solve the problem of insufficient oxidation resistance of the existing fuel cell proton exchange membrane. The method comprises the following steps: 1, preparing polybenzimidazole; (2) preparing cystine functionalized MXene; and 3, preparing a cystine functionalized MXenen and OPBI compounded proton exchange membrane, and then dipping in a phosphoric acid solution. According to the application of the cystine functionalized MXene / polybenzimidazole composite membrane for the high-temperature fuel cell in HT-PEM, the conductivity and oxidation resistance of a proton exchange membrane are improved, a basis is provided for developing novel efficient HT-PEM, and the cystine functionalized MXene / polybenzimidazole composite membrane is applied to the technical field of proton exchange membrane fuel cells.

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 loose nanofiltration membrane with a slow-release sterilization function and a preparation method of the loose nanofiltration membrane. The nanofiltration membrane can realize slow release and long-acting antibiosis of silver ions. The preparation method of the membrane comprises the following steps: synthesizing UiO-66-NH2 nano particles by a hydrothermal method, mixing the UiO-66-NH2 nano particles with an AgNO3 solution, and reducing by using NaBH4 to prepare Ag-coated UiO-66-NH2 nano particles; the preparation method comprises the following steps: blending Ag-coated UiO-66-NH2 and polybenzimidazole, preparing a PBI-based mixed matrix membrane by using a non-solvent induced phase inversion method, and then crosslinking the PBI-based mixed matrix membrane by using trimesoyl chloride to obtain the biological pollution resistant loose nanofiltration membrane. Test results show that the loose nanofiltration membrane prepared by the method has excellent dye desalination performance and antibacterial performance. The salt retention rate is less than 1% while the crystal violet dye retention rate is kept to be 99% or above. An antibacterial experiment shows that after the membrane is co-cultured for 36 hours, the antibacterial rates of the membrane on escherichia coli and staphylococcus aureus respectively reach 97.4% and 96.3%. Slow-release experiments show that the prepared loose nanofiltration membrane can stably maintain the release amount at 0.1 [mu] g.L <-1 >. Day <-1 >, and can realize long-term effective sterilization.

The invention relates to a high-temperature proton exchange membrane, in particular to a semi-interpenetrating high-temperature proton exchange membrane based on imidazolyl polyion liquid and a preparation method of the semi-interpenetrating high-temperature proton exchange membrane. The preparation method comprises the following steps: dissolving polybenzimidazole, a silane coupling agent and the imidazolyl polyionic liquid in dimethyl sulfoxide to obtain a mixture, spreading and drying the mixture to prepare a membrane, and performing acid catalysis to form a silicon-oxygen cross-linked structure, thereby obtaining the semi-interpenetrating high-temperature proton exchange membrane based on the imidazolyl polyionic liquid. A silicon-oxygen cross-linked network structure is introduced into the proton exchange membrane, so that the oxidation resistance and tensile strength of the membrane can be improved, and the swelling rate of the acid-doped membrane can be reduced; the phosphoric acid adsorption rate can be improved by introducing the imidazolyl polyion liquid, so that the proton conductivity is improved.

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 discloses a catalyst layer of a high-temperature proton exchange membrane fuel cell and a preparation method thereof, and the method comprises the following steps: step 1, taking glycidyl trimethyl ammonium chloride and polybenzimidazole as reactants, and carrying out quaternization reaction to obtain quaternized polybenzimidazole; step 2, mixing the quaternized polybenzimidazole, a binder and a catalyst to obtain a uniform catalyst slurry; and step 3, coating carbon paper with the uniform catalyst slurry to obtain the catalyst layer. The catalyst layer prepared by the method can effectively adjust the distribution of phosphoric acid in the catalyst layer, reduce the coverage of phosphoric acid on catalyst active sites, reduce the migration and loss of phosphoric acid from a proton exchange membrane, and ensure the proton transfer efficiency of the proton exchange membrane, thereby improving the performance and stability of the high-temperature proton exchange membrane fuel cell.

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 invention discloses a cross-linked polybenzimidazole ion exchange membrane as well as a preparation method and application thereof. The cross-linked polybenzimidazole ion exchange membrane is a cross-linked polybenzimidazole ion exchange membrane with a three-dimensional grid structure, which is formed by taking polybenzimidazole resin as a cross-linked skeleton and carrying out cross-linking reaction through a cross-linking agent; wherein the cross-linking agent is selected from at least one of halogenated xylene and halogenated dimethylnaphthalene. The cross-linked polybenzimidazole ion exchange membrane has the characteristics of simple preparation method, environment-friendly process and the like. Compared with the original uncrosslinked polybenzimidazole ion exchange membrane, the crosslinked polybenzimidazole ion exchange membrane has higher chemical stability in an alkaline system, the cycle life of a battery is prolonged, meanwhile, the migration problem of an electrolyte solution can be effectively inhibited, and the charge-discharge performance of the battery is improved.

The invention discloses a gel type mixed matrix high-temperature proton exchange membrane based on metal organic framework loaded phosphoric acid and a preparation method of the gel type mixed matrix high-temperature proton exchange membrane, a membrane material is prepared by adding turbid liquid of a metal organic framework MIL-101 (Cr) and water into a polybenzimidazole solution to form gel state mixed liquid and then scraping the membrane; mIL-101 (Cr) and deionized water are mixed in advance to form a uniform suspension, the suspension is slowly added into a polybenzimidazole solution, the dispersity of the MIL-101 (Cr) in a PBI matrix is improved and agglomeration is inhibited by utilizing a hydrolysis reaction of polyphosphoric acid (PPA), and phosphoric acid loaded in a cavity of the MIL-101 (Cr) can provide an extra micro-nano space and a proton conduction path, so that the performance of the composite material is improved. The acid doping level and the proton conductivity of the membrane are improved.

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.