Method for preparing proton exchange membrane with polyvinylidene fluoride grafted and grafting copolymerized with 2-acrylamido-2-methylpropanesulfonic acid

Abstract

The invention relates to a method for preparing proton exchange membrane with polyvinylidene fluoride grafted and grafting copolymerized with 2-acrylamido-2-methylpropanesulfonic acid, which belongs to the field of battery electrolyte material. The method comprises: dissolving a silicon compound in water-containing N-methyl pyrrolidone solution; adding polyvinylidene fluoride PVDF and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) to the solution; adding initiator; heating and stirring; casting the solution onto a clean glass plate; drying the obtained product; and removing membrane to obtain graft copolymer membrane with modified PVDF and 2-acrylamido-2-methylpropanesulfonic acid. The proton exchange membrane prepared by the method not only has good proton-conducting pieces, but also is convenient for mass production.

Description

technical field [0001] The invention relates to a preparation method of a polyvinylidene fluoride graft blended poly 2-acrylamide-2-methylpropanesulfonic acid proton exchange membrane, belonging to the field of battery electrolyte materials. Background technique [0002] In proton exchange membrane fuel cells and direct methanol fuel cells, the proton exchange membrane electrolyte is the key material in the battery, and the performance of the proton exchange membrane will directly affect the performance of the battery. Therefore, the proton exchange membrane has always been a key topic in the research and development of fuel cells. At present, the widely used proton exchange membrane is mainly the perfluorosulfonic acid ion exchange membrane (Nafion membrane) produced by DuPont Company of the United States. This kind of proton exchange membrane has good proton conductivity, but because it is a perfluorinated ion exchange membrane, the production cost is relatively expensive,...

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Problems solved by technology

However, methanol is used as fuel in direct methanol fuel cells, so the proton exchange membrane in the battery is required not only to have high proton conductivity, but also to have very low methanol permeability, which makes the widely used perfluorosulfur Acid proton exchange membranes are no longer suitable

In order to obtain a proton exchange membrane suitable for direct methanol fuel cells, it is proposed to use polyvinylidene fluoride grafted polystyrene sulfonic acid membrane, but this membrane must use radiation to excite free radicals, on the other hand grafted to polystyrene sulfonic acid membrane. The polystyrene on the vinylidene fluoride membrane needs to be sulfonated, which is complicated and not conducive to large-scale production

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