122 results about "Alkaline anion exchange membrane" patented technology

The invention discloses a branched side chain polymer anion exchange membrane and a preparation method thereof. Preparation of the membrane material is based on the situation that chloromethyl polysulfone serves as a macroinitiator, p-chloromethyl styrene serves as a monomer, and a series of polymers containing branched side chain structures are synthesized through an ATRP reaction. Rich end groups with high chemical reactivity are utilized, and the alkaline anion exchange membrane with a low chloromethylation degree and high conductivity can be prepared through after-treatment. In addition, micro-phase separation of different degrees can be achieved in the membrane by modulating the branching degrees of side chains, and the objective of considering both the conductivity and stability of the anion exchange membrane is achieved. The prepared anion membrane is high in structural adjustability, high in conductivity and good in self-rejection swelling property, and has great significance for research on the conductivity and stability balance of the membrane.

The invention relates to an imidazolyl ionic liquid and preparation of an alkaline anion exchange membrane with the same. The preparation includes the following three steps: synthesis of an imidazolium salt, synthesis of imidazolyl cross-linked copolymer, and preparation of an imidazolyl cross-linked type alkaline anion exchange membrane, and at the same time on the basis, the step of preparation of an oxyhydrogen type imidazolyl cross-linked alkaline anion exchange membrane can be added so as to further improve the conductivity of the membrane. The ionic liquid involved in the invention substitutes the 2-position of an imidazole ring, thus avoiding imidazole group ring opening and degradation occurring under the attack of hydroxyl ions, and enhancing the stability of the imidazole group. And the method of applying the imidazolyl ionic liquid to preparation of the alkaline anion exchange membrane has the advantages of environmental friendliness, simple process, and can realize large-scale production. The prepared imidazolyl cross-linked alkaline anion exchange membrane has a uniform, smooth and compact surface, and has good conductivity, good thermal stability and chemical stability. By applying the alkaline anion exchange membrane to alkaline direct alcohol fuel cells, a single battery has the advantages of high performance, and obvious performance advantages, etc.

The invention discloses a multibranched polyaryletherketone anion-exchange membrane and a preparation method thereof and belongs to the technical field of alkaline anion-exchange membranes. At first,an amino substituted polyaryletherketone polymer with favorable solubility and stability is synthesized, and then amino of the polymer is directly taken as a grafting site to perform functional grafting on the polymer to obtain a membrane material and prepare the membrane. The prepared multibranched polyaryletherketone anion-exchange membrane has good alkali stability and high ionic conductivity and can be applied to alkaline fuel cells.

The invention discloses strongly alkaline polyarylether ionomer and preparation and application thereof. The strongly alkaline polyarylether ionomer is prepared by polymerizing 2 (4, 4'-hydroxyphenyl) diphenylmethane and chlorine-containing or fluorine-containing aromatic monomer with Ar1 and Ar1 structure to obtain polyarylether, and subjecting the polyarylether to a series of functional processes such as chloromethylation, quaternization and alkalization. An alkaline anion exchange membrane is prepared by casting chloromethylation-based polyarylether solution into a membrane and subjecting the membrane to a series of functional processes such as quaternization and alkalization. The alkaline anion exchange membrane has fine barrier action on methyl alcohol, is fine in physicochemical property, high in thermal stability and fine in conductivity at high temperature, overcomes the defects of unstable property and low ionic conductivity of existing polyarylether anion exchange membranes, is applicable to fuel cell alkaline anion exchange membranes, and has broad application prospect.

The invention discloses a preparation method of a blended cross-linked anion exchange membrane. The preparation method includes: using low-price vinyl imidazole monomer as a raw material, utilizing a radical polymerization method to prepare polyvinyl imidazole, using benzyl bromide as a quaternization reagent to be in reaction with polyvinyl imidazole to prepare a brominated polyvinyl benzyl imidazolium salt, subjecting the brominated polyvinyl benzyl imidazolium salt and pendant amino containing polybenzimidazole to solution blending, and using low-price epoxy resin as a cross-linking agent to obtain a brominated polyvinyl benzyl imidazolium salt / polybenzimidazole blended cross-linked anion exchange membrane; soaking the membrane in an alkali solution, taking the membrane out, and washing the same to be neutral to obtain a hydroxide polyvinyl benzyl imidazolium salt / polybenzimidazole blended cross-linked anion exchange membrane. The alkaline anion exchange membrane has high ion exchange capacity, high hydroxyl conductivity, good mechanical strength and low swelling rate.

Embodiments of the present disclosure encompass vinyl addition and ROMP polymers having at least one type of repeating unit that encompasses a comprise N+(CH3)3 OH moiety. Other embodiments in accordance with the disclosure include alkali anion-exchange membranes (AAEMs) made from one of such polymers, anion fuel cells (AFCs) that encompass such AAEMs and components of such AFCs, other than the AAEM, that encompass one of such polymers.

The invention relates to a method for preparing a homogeneous phase strong alkali anion exchange membrane by a radiation grafting method. The method comprises the following steps: dissolving glycidyl methacrylate in N,N-dimethylformamide to prepare a solution with the concentration of 5-30% in percentage by volume; adding polymerization inhibitor copper sulfate to form a grafting reaction solution; immersing a high-density polyethylene film into the grafting reaction solution; desorbing dissolved oxygen in the grafting reaction solution; placing into cobalt source for mutual irradiation grafting after being sealed to obtain a grafting membrane, wherein, the total irradiation dose is 5-20 kGy, the irradiation dose rate is 1.5 kGy / h (the value is fixed); taking out the grafting membrane; immersing into trimethylamine aqueous solution with the concentration of 33% in percentage by mass; reacting for 1-10h at the temperature of 5 DEG C while stirring; taking out the sample after ammoniation reaction, washing with water and drying to obtain the homogeneous phase strong alkali anion exchange membrane. The method of the invention not only can flexibly control homogeneous membrane anion exchange capacity, and the preparation method is easy to operate, has no toxicity and environmental pollution.

The invention relates to an alkaline anionic exchange membrane, in particular to an alkaline anionic membrane and a preparation method thereof. The structural formula of the membrane is shown in the specification, wherein m=1-1000, n=1-10000 and h=1000-20000. The membrane prepared by the invention is better in heat stability, alkali resistance and battery performance.

The invention discloses a side group-modified oxygen-free polymer anion exchange membrane and a preparation method thereof, belonging to the technical field of basic anion exchange membranes. According to the invention, an ether-free oxygen bond polymer with good solubility and stability is synthesized at first, then the polymer is subjected to functional grafting with the amine group of the polymer as a grafting site so as to obtain a membrane material, and finally, the membrane is prepared. The prepared membrane has good alkali stability and high ionic conductivity and can be applied to an alkaline polymer electrolytic cell.

A fuel cell membrane electrode subassembly comprises an electrolyte membrane and catalyst layers attached to two sides of the electrolyte membrane. The catalyst layer is a porous thin-layer with a conductive high-molecular polymer-electrocatalyst as the framework. Thickness of the thin-layer is 10-500 microns; pore diameter of the thin-layer is 1-50 microns; and pore wall thickness is 0.1-1 micron. When the electrolyte membrane is a proton exchange membrane, the conductive high-molecular polymer is a cationic conductive high-molecular polymer. When the electrolyte membrane is an alkaline anion-exchange membrane, the conductive high-molecular polymer is an anionic conductive high-molecular polymer. A preparation method of the catalyst layer comprises the following steps: dispersing catalyst slurry on a substrate surface, refrigerating below 0 DEG C for no less than 5 h, and carrying out vacuum drying so as to obtain a catalyst layer attached to the substrate surface. The catalyst slurry comprises an electrocatalyst, a conductive high-molecular polymer and solvent water. In comparison with the prior art, the product of the invention has low loss late of catalyst and good repeatability, is not influenced by environmental factor and is easy for batch preparation. The catalyst in the catalyst layer or the membrane electrode subassembly prepared by the method has advantages of uniform distribution, high utilization rate, controllable pore structure and the like.

In the formula of an N1 position-substituted imidazole compound, R2 is a C1-C10 straight-chain paraffin; and R2 is a C1-C9 chain alkane, or a C3-C6 cycloalkane, or a phenyl group, or a biphenyl group. An alkaline anion exchange membrane comprises a halomethylated high-molecular polymer main chain and an N1 position-substituted imidazole branch chain represented by a molecular formula shown in the description. A preparation method of the alkaline anion exchange membrane comprises the following steps: synthesizing N1 position-substituted imidazole; preparing the halomethylated high-molecular polymer main chain; and preparing the N1 position-substituted imidazole type alkaline anion exchange membrane. The N1 position-substituted imidazole has the advantages of good stability, no toxicity and moderate molecular weight; and the N1 position-substituted imidazole type alkaline anion exchange membrane prepared in the invention has the advantages of uniform and smooth surface, good thermal stability, good mechanical strength, and good application values in alkaline fuel cells.

The invention specifically relates to a cross-linked polybenzimidazole basic anion exchange membrane, and preparation and application thereof, belonging to basic anion exchange membrane fuel cells. The method comprises the following steps: synthesis of N1-long-chain alkane substituted-1,4-diazabicyclo[2.2.2]octane; and preparation of the N1-long-chain alkane substituted-1,4-diazabicyclo[2.2.2]octane functionalized polybenzimidazole-polyvinylbenzyl chloride cross-linked basic anion exchange membrane. According to the invention, the cross-linked anion exchange membrane is prepared by using a homogeneous method, and cross-linking and quaternization are completed in one step, so operation is simple and efficient, and the mechanical strength and dimensional stability of the cross-linked membrane are improved; a homogeneous reaction adopted in the process of preparation effectively improves the efficiency of quaternization, and a microscopic phase separation structure in the membrane allowsthe cross-linked membrane to have higher conductivity; and the cross-linked polybenzimidazole basic anion exchange membrane has the advantages of excellent dimensional stability, chemical stability and the like, and has potential application prospects in basic anion exchange membrane fuel cells.

The invention relates to a preparation method of an alkaline anion exchange membrane. The preparation method comprises the following steps: (1) mixing a polymer monomer, aggregate type ionic liquid modified oxidized graphene, a crosslinking agent, and an initiator according to the weight ratio of (60-95):(0.1-20):(0.1-15):(1-5) for in-situ polymerization to obtain a macromolecular membrane; (2) immersing the macromolecular membrane in an alkaline solution for anion exchange to obtain the alkaline anion exchange membrane. The aggregate type ionic liquid modified oxidized graphene is grafted to a polymer substrate through a chemical bond, so that the physical and chemical stability of the hybridized anion exchange membrane is improved; aggregate type ionic liquid is prepared into the anion exchange membrane, so that the ionic liquid is high in thermal stability and stable in chemical property; the prepared ionic liquid-based anion exchange membrane is higher in thermal stability and alkali resistance; the crosslinking agent is introduced to adjust the water absorption rate and the swelling degree of the anion exchange membrane; due to the formation of a crosslinking network, the mechanical property of the anion exchange membrane is greatly improved.

The invention discloses a preparation method of an alkaline anion-exchange membrane. The preparation method comprises the treatment process on alkaline resin, and the treatment process comprises the steps that AER alkaline resin is placed in an inorganic salt aqueous solution for soaking, then the AER alkaline resin and the inorganic salt aqueous solution are transferred to a heat-insulated vessel, liquid nitrogen is injected into the vessel for cooling, and AER alkaline resin particles are fully ground and crushed; liquid nitrogen freezing treatment is stopped, when the temperature is naturally recovered to room temperature, materials in the vessel are filtered with a filter screen, and fine alkaline resin powder is obtained. The fine alkaline resin powder serves as anion exchange resin of a chemical active group to prepare the alkaline anion-exchange membrane. By means of the resin treatment process, the AER alkaline resin particles can be uniformly distributed in the prepared anion-exchange membrane, the electrochemical performance of the alkaline anion-exchange membrane is further improved, and a fuel cell assembled through the alkaline anion-exchange membrane prepared through the method shows the excellent electricity generation performance.

The invention relates to an alkaline anion exchange membrane and a production method thereof. A chlorine methyl group contained polymer serves as a main chain of membrane materials and the novel alkaline anion exchange membrane is produced after ionization through the ATRP (Atom Transfer Radical Polymerization) reaction grafting modification. A fat chain structure is introduced into a side chain after ATRP reaction grafting, an imidazole group can be added to obtain the membrane materials which are of an obvious micro phase separation structure, and accordingly the ionic conduction is facilitated. The five-membered heterocycle conjugation effect is achieved through imidazole small molecules, meanwhile the hofmann degradation can be effectively eliminated, and accordingly the stability of the membrane is improved. The produced alkaline anion exchange membrane structure can be regulated, the alkali-resistant stability, the heat stability and the battery performance are high, and meanwhile the great significance on the exploration on the alkali stability influence mechanism and improvement strategies of the membrane is achieved.

The invention relates to an alkaline anion exchange membrane fuel cell material, in particular to a preparation method of a three-dimensional resin solution for an alkaline anion exchange membrane fuel cell. The method comprises the steps of chloromethylation and quaternization of a polymer and is characterized in that chloromethylation reaction is carried out on a styrenic block copolymer by using lewis acid and a chloromethylation reagent, and then the chloromethylation polymer is dissolved for quaternization reaction to obtain the three-dimensional resin solution containing Cl-. When the three-dimensional resin prepared according to the preparation method is used in the alkaline anion exchange membrane fuel cell, the peak power density of the battery reaches 314mW / cm<2>.

The invention discloses a composite polyepoxy chloropropane alkaline polymer membrane electrode and a preparation method thereof. The membrane electrode comprises an alkaline anion-exchange membrane and an electrode layer, wherein the alkaline anion-exchange membrane is prepared by the following steps: carrying out nucleophilic substitution reaction on halogen atom and tertiary amine to obtain quaternized polyepoxy chloropropane, and compounding with a porous polytetrafluoroethylene membrane; the electrode layer comprises a hydrogen electrode and an oxygen electrode, the hydrogen electrode comprises a gas diffusion layer and a hydrogen electrode catalytic layer sprayed on the gas diffusion layer, and the oxygen electrode comprises a gas diffusion layer and an oxygen electrode catalytic layer sprayed on the gas diffusion layer; the membrane electrode is integrally formed according to the combination sequence of the hydrogen electrode, the alkaline anion-exchange membrane and the oxygen electrode; and the gas diffusion layer is formed by adding hydrophobic polymer to the matrix carbon material. The alkaline membrane electrode disclosed by the invention has the advantages of simple synthesis method of the alkaline anion-exchange membrane, and high ionic conductivity, can adopt a low-cost non-platinum-based catalyst, and is suitable for alkaline anion-exchange membrane fuel batteries.

The invention discloses a method for preparing a long chain branch polyphyenyl ether anionic membrane, and belongs to the technical field of membranes. According to the membrane material, a long chain branch with a certain toughness is introduced into polyphenyl ether used as a main chain by acylation, condensation reaction and bromination and is ionized to prepare a novel alkaline anionic exchange membrane. In the preparing process, the long chain branch is introduced, so that the membrane has excellent alkali resistance, relatively high ionic conductance and excellent size stability, and can be used as an anionic exchange membrane material for alkaline fuel cells.

The invention discloses an anion-exchange membrane containing a xanthene structure and a preparation method and application of the anion-exchange membrane. The anion-exchange membrane is a polyarylether compound containing a quaternary ammonium salt side group and the xanthene structure, and the structure of the anion-exchange membrane is shown as a formula (I) (please see the formula in the description). According to the method, an aromatic bisphenol monomer containing the xanthene structure, an aromatic dihalogenation monomer Ar1 containing halogen atoms or / and an aromatic dihalogenation monomer Ar3 containing the halogen atoms and other aromatic bisphenol monomer Ar2 are taken as raw materials to be copolymerized to obtain a polyarylether compound containing the xanthene structure, then bromination and quaternization reactions are performed, and finally membrane coating and anion exchange are performed. The anion-exchange membrane takes polyether sulfone or / and polyether ketone as a framework of the proton exchange membrane, has the higher mechanical property and thermal stability, takes the quaternary ammonium salt group as the side group of the proton exchange membrane, has the good chemical stability and ionic conduction function and can serve as a battery diaphragm to be applied to an alkaline anion-exchange membrane fuel battery and an all-vanadium redox flow battery.

The invention relates to an alkaline anion exchange membrane, a preparation method thereof and a preparation method of a formate fuel cell. In the alkaline anion exchange membrane, polybenzimidazole is used as the basal body of an alkaline membrane, and layered bimetal hydroxide nanoparticles are introduced to improve the ionic conductivity of the membrane. Polybenzimidazole has excellent high temperature resistance and corrosion resistance, good hydrophilicity, good thermal stability and good mechanical properties. The imidazole ring in the molecular structure of polybenzimidazole has two functional groups of -N= and -NH-, and has good hydroxyl conduction properties after alkali doping. The layered bimetal hydroxide layer has exchangeable anions between sheet-like structures, has good hydroxyl conductivity after the exchange of hydroxyl ions, and thus is widely used as an ion exchange carrier. Since the layered bimetal hydroxide has good alkali stability because of being synthesized in an alkaline environment.

The invention belongs to the field of anion exchange membrane preparation of a fuel cell and particularly relates to a biimidazole cation alkaline anion exchange membrane based on polyphenylene ether and a preparation method thereof. The anion exchange membrane with relatively high ion conductivity, heat stability, chemical stability and mechanical property is prepared through a simple environmental-friendly preparation method.

The invention relates to a preparation method of an anion-exchange membrane, which comprises the following steps: generating free radicals on the surface of polymer powder by plasma bombardment, carrying out graft copolymerization on the free radicals and chloromethyl styrene monomer, introducing functional radicals onto the polymeric matrix, and quaternizing and alkalifying the functional radicals to form ion-exchange radicals, thereby obtaining the anion-exchange membrane of which the functional radicals are uniformly distributed in the longitudinal direction. The method provided by the invention has the advantages of no toxicity and no environment pollution, and does not damage the polymer frame. The prepared anion-exchange membrane has the advantages of favorable thermal stability, chemical stability, electron exchange capacity and ionic conductivity, and low methanol transmittance, is suitable for polymer dielectric fuel batteries, and is especially suitable for alkaline direct alcohol fuel batteries.

A method for preparing an alkaline anion exchange membrane based on a branched oxygen-free main chain belongs to the field of battery membrane materials. The method comprises: firstly, dissolving 1,3,5-triphenylbenzene, N-methylpiperidone, biphenyl and trifluoroacetone in a solvent, adding an catalyst under an ice bath condition, and obtaining a polymer main chain having a branching degree of 1 to5 after a reaction; secondly, dissolving and reacting N-methylpiperidine and 1,6-dibromohexane in ethyl acetate, and then processing an obtained product ionization reagent; finally, performing the ionization of the polymer membrane main chain, casting membrane, and alkali treatment to obtain an anion exchange membrane. The method reduces the risk that hydroxide attacks the membrane by using the oxygen-free main chain, thereby enhancing the alkali resistance of the anion exchange membrane. The branched structure provides a certain free volume to help build ion transmission channels, and the ion reagent can promote the formation of ion clusters as well as the separation of hydrophilic and hydrophobic microphases, thereby significantly improving the conductivity of the membrane.

The invention relates to an alkaline anion exchange membrane and a preparation method thereof. A composite membrane is prepared by carrying out ultrasonic dispersion mixing on an inorganic nanofiller with chloromethylated polyether-ether-ketone polymer as matrix and imidazole substance as ionic agents. The inorganic nanofiller is nanometer zirconium oxide, nanometer zinc oxide or nanometer titania. The polyether-ether-ketone used by the invention is high-performance commercialized polymer materials of aromatic semicrystalline thermoplastic polymer and has high chemical stability, high heat stability and a high mechanical property; the inorganic nano-materials have excellent water-absorbing quality, an excellent mechanical property and certain hydroxyl transmissibility. The preparation method of the organic-inorganic composite membrane of the invention is simple and easy to industrialize, and the composite membrane of the invention can be applied to an alkaline fuel cell.

The invention provides a method for preparing a cross-linked alkaline anion exchange membrane based on a flexible long side chain polycation structure, and belongs to the field of fuel cell anion exchange membrane materials. The alkaline anion exchange membrane is prepared by subjecting a halogenated polycation cross-linking agent and a biphenyl polymer to a menshutkin reaction, including four steps composed of synthesis of a polymer main chain, ionization of a polymer membrane main chain, film casting, and alkali treatment. The method of the invention is simple. The polycation structure promotes the formation of a hydrophilic and hydrophobic microphase separation structure. The flexible long side chain cross-linked structure inhibits the water absorption and swelling of the membrane, improves the mechanical properties of the membrane on the basis of ensuring electrical conductivity, thereby mitigating the contradiction between the electrical conductivity and the mechanical strength, and improving the alkali stability of the ion exchange membrane.

The invention relates to a preparation method for an alkaline anion-exchange membrane electrode. The method comprises the following steps: (1) spraying a layer of binder on two surfaces of an alkaline anion-exchange membrane; (2) spraying a catalyst layer on the binder, wherein the surface of porous carbon paper sprayed with a gas diffusion layer is accordingly arranged on the catalyst layer; (3) carrying out hot pressing and natural cooling so as to obtain the alkaline anion-exchange membrane electrode. According to the invention, a high-pressure gas spray gun is used for successively spraying alkaline anion resins and the catalyst layers on two surfaces of the alkaline anion-exchange membrane, which enables a three-in-one assembly with stable uniformity and bonding tightness to be formed and the anion exchange rate of an alkaline fuel cell to be enhanced; the diffusion layers are arranged on the catalyst layers through hot pressing so as to form a five-in-one assembly, which enables the anion exchange rate of the alkaline fuel cell to be further enhanced, thereby producing an effect on improvement of performance of the fuel cell; when the electrode prepared in the invention is used to substitute a diaphragm and alkaline electrolyte in an alkaline fuel cell, the prepared alkaline fuel cell has high security and an enlarged application scope.

The invention relates to a basic anion-exchange membrane fuel battery, and particularly relates to a preparation method of a membrane electrode with a transition layer. The preparation method comprises the following steps: coating basic anion exchange resin between a basic anion-exchange membrane and a catalyst layer to serve as a transition layer, and then coating the transition layer with the catalyst layer consisting of a catalyst and the basic anion-exchange resin to form the membrane electrode with the transition layer, wherein the membrane electrode consists of the basic anion-exchange membrane, the transition layer and the catalyst layer; placing the membrane electrode between two gas diffusion layers to form a membrane electrode assembly, and preparing the membrane electrode with the transition layer. The membrane electrode with the transition layer, prepared by adopting the preparation method, aims at improving phase interface bonding strength of the catalyst layer and the basic anion exchange membrane, enlarging a three-phase reaction interface, promoting the conduction of OH<-> of a cathode catalyst layer, an anode catalyst layer and the basic anion-exchange membrane, improving the performance of the basic anion-exchange membrane fuel battery and the operation stability of the basic anion-exchange membrane fuel battery.

The invention relates to the technical field of membrane and discloses a method for preparing a zwitterion membrane by use of alkaline anion exchange membrane solution and acid cation exchange membrane solution. The acid cation exchange membrane solution is prepared from polyving alcohol (PVA) and polysilicon copolymer containing -COOH group or acid-type sulfonated polyphenylene oxide containing -SO3 group; the alkaline anion exchange membrane solution is prepared from PVA, alkaline ammonium polyphenylene oxide containing -N+(CH3)3OH- group and micromolecule alkoxyl silane crosslinking agent. The acid cation exchange membrane solution and the alkaline anion exchange membrane solution are blended through pre-sol-gel reaction, so that the acid group (-COOH or -SO3) can be combined with the alkaline group (-N+(CH3)3OH-) to form an ion pair, and a self-assembly structure is formed through combination of ionic bonds, therefore, the zwitterion membrane has a closely-connected ion pair structure and the stability and the separating property of the membrane can be improved.

The invention discloses a trimethylamine functionalized polyarylindole anion exchange membrane and a preparation method thereof, belonging to the technical field of basic anion exchange membrane. Theinvention synthesizes aromatic amide group polyarylindole polymer with good stability and mechanical properties, and further combines the polymer and1, 2-graft copolymerization are subjected to reaction with hydrophobic chain / ether oxygen chainso as to graft with trimethylamine functional groups. The prepared membranes have good alkaline stability and mechanical properties and can be used in alkaline fuel cells.