GAS SEPARATION MEMBRANES

摘要

A gas separation membrane obtained by a process comprising modifying a polyimide discriminating layer having acid groups, the process comprising the step of crosslinking the acid groups with an organic polyamine, CHARACTERISED IN THAT the organic polyamine has an Mw of at least 400 KDa and the process is performed such that said crosslinking is predominantly non-covalent crosslinking. The process results in gas separation membranes having good gas flux, selectivity and low cratering.