Abstract: The present invention relates to a cross-linked porous membrane from hydrolysis of ester-containing side chain and a preparation method thereof. Firstly, membrane material is obtained through copolymerization of four monomers including butyl methacrylate, styrene, sodium sulfonated styrene and vinylbenzyl chloride. In membrane formation, a small amount of lithium chloride micromolecule porogen is added and cross-linked by using tetramethyl hexamethylene diamine to prepare a nanoscale dense membrane through hydrolysis under the alkaline condition. Through the characteristic of hydrolysis of a butyl ester side chain in the polymer under the alkaline condition, the space originally occupied by the butyl ester in the hydrolyzed membrane is vacated; and after hydrolysis, with the appearance of carboxylic acid ionic conduction groups, a large quantity of ester bonds is hydrolyzed, so that the patency of ion transfer channels in the membrane is enhanced. Thus, ionic conductivity of the membrane is greatly enhanced.

Abstract: The present invention relates to a cross-linked porous membrane from hydrolysis of ester-containing side chain and a preparation method thereof. Firstly, membrane material is obtained through copolymerization of four monomers including butyl methacrylate, styrene, sodium sulfonated styrene and vinylbenzyl chloride. In membrane formation, a small amount of lithium chloride micromolecule porogen is added and cross-linked by using tetramethyl hexamethylene diamine to prepare a nanoscale dense membrane through hydrolysis under the alkaline condition. Through the characteristic of hydrolysis of a butyl ester side chain in the polymer under the alkaline condition, the space originally occupied by the butyl ester in the hydrolyzed membrane is vacated; and after hydrolysis, with the appearance of carboxylic acid ionic conduction groups, a large quantity of ester bonds is hydrolyzed, so that the patency of ion transfer channels in the membrane is enhanced. Thus, ionic conductivity of the membrane is greatly enhanced.