Polysulfone with quaternary ammonium group at side chain and preparation method of polysulfone

Abstract

The invention provides polysulfone with a quaternary ammonium group at a side chain. The content of the quaternary ammonium group in polysulfone is controllable; and polysulfone with the quaternary ammonium group at the side chain can be used for preparing an anionic exchange membrane which is high in electrical conductivity, good in mechanical performances and low in price. The invention further provides a preparation method of polysulfone with the quaternary ammonium group at the side chain. Besides, the invention further provides the anionic exchange membrane.

Description

technical field [0001] The invention relates to the field of polymers and their preparation, in particular to a polysulfone with side chains containing quaternary ammonium groups and a preparation method thereof. Background technique [0002] Anion exchange membrane is a membrane material with positively charged ionic groups fixed on the membrane body, which can selectively pass through anions. It has excellent ion selectivity and mechanical properties. In recent years, it has been used in many fields such as electrolysis and fuel cells. been widely studied and applied. [0003] Anion exchange membranes are usually prepared from polymers containing quaternary ammonium groups. Structurally speaking, the quaternary ammonium groups contained in traditional anion exchange membranes are benzylic quaternary ammonium groups such as the most commonly used benzyltrimethyl quaternary ammonium groups, but the alkali resistance of benzyl quaternary ammonium groups in this anion exchang...

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Problems solved by technology

Structurally speaking, the quaternary ammonium groups contained in traditional anion exchange membranes are benzylic quaternary ammonium groups such as the most commonly used benzyltrimethyl quaternary ammonium groups, but the alkali resistance of benzyl quaternary ammonium groups in this anion exchange membrane Not enough, unable to meet the long-term use requirements in the working environment of alkaline fuel cells (J.R.Varcoe and R.C.T.Slade, Fuel Cells, 2005,5,187-200.), which is also a bottleneck problem currently restricting the development of alkaline anion exchange membrane fuel cells

In terms of synthetic methods, traditional polymers containing quaternary ammonium groups usually need to synthesize the polymer main chain first, then carry out chloromethylation of the aryl groups on the polymer main chain, and then react with tertiary ammonium to convert benzyl The conversion of base chloride into quaternary ammonium groups is not only complicated in steps but also difficult to accurately control the amount of quaternary ammonium groups introduced. In addition, carcinogenic chloromethyl ether reagents are usually used in the chloromethylation process.

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