SULFONATION OF AROMATIC POLYETHER SULFONE, SULFONATED POLYETHER SULFONE AND PRODUCTION OF FILM

摘要

The sulphonation of aromatic polyether sulphones succeeds in a controllable manner by means of sulphur trioxide in concentrated sulphuric acid as solvent. If a sulphur trioxide content of less than 6 per cent by weight, based on the solvent, and a reaction temperature of less than 30 DEG C are maintained, side reactions and degradation reactions can be substantially suppressed. …??The products obtained are suitable for the production of membranes.