Anion-exchange membrane and preparation method thereof

Abstract

The invention discloses an anion-exchange membrane and a preparation method thereof. The preparation method comprises the following steps of: mixing a macromolecular reinforcing agent, a polymerizing monomer, an initiator and a cross-linking agent to obtain a casting solution; sequentially coating and heating the casting solution to form a macromolecular copolymer; and then carrying out quaterisation treatment to obtain the anion-exchange membrane. According to the invention, the cross-linking agent containing multifunctional groups is added to the preparation process of the anion-exchange membrane; benzyl chloride groups in the macromolecular copolymer, formed by polymerizing monomers, and amino groups contained in the cross-linking agent are nucleophilically substituted, and meanwhile, cardo in the macromolecular reinforcing agent and primary amine groups contained in the cross-linking agent are lactamized, so that the macromolecular reinforcing agent and the macromolecular copolymer are cross-linked by using the cross-linking agent, the phase-splitting between the macromolecular copolymer and the macromolecular reinforcing agent is avoided, and the stability of the membrane is improved. Meanwhile, the method can be used for avoiding use of an organic solvent and has remarkable economic and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of membranes, and more specifically relates to an anion exchange membrane and a preparation method thereof. Background technique [0002] Anion exchange membranes can selectively pass through anions and block the penetration of cations. They are key components of membrane electrolysis, electrodialysis, differential pressure dialysis and fuel cells, and are widely used in diffusion dialysis, electrodialysis, alkaline fuel cells and chemical sensors. The preparation method and performance of anion exchange membranes have always been concerned by the theoretical and industrial circles. The preparation method generally adopted in the prior art is: forming a film of a polymer with functional groups, and then soaking in an amine solution to obtain anion exchange groups, thereby preparing an anion exchange membrane. [0003] Anion-exchange membranes and their preparation methods have been widely reported. For exam...

AI Technical Summary

Problems solved by technology

However, in this method, due to the pure physical blending between the polymer copolymer formed by the polymerization of chloromethylated styrene and divinyl and the polyether ketone with phenolphthalein side groups as a polymer reinforcing agent, there is a lack of chemical bonds. The cross-linking of the above two polymers inevitably exists in the membrane, which reduces the stability of the membrane and limits the application of the prepared anion exchange membrane.