Reverse Osmosis Performance and Chlorine Resistance of New Ternary Aromatic Copolyamides Comprising 3,3'-Diaminodiphenylsulfone and a Comonomer with a Carboxyl Group

摘要

The preparation of asymmetric flat membranes from a series of novel aromatic polyamides comprising 3,3'-diaminodiphenylsulfone and a comonomer with a carboxyl group(&BOND;COOH) were studied and the measurements of reverse osmosis (RO) performance and chlorine resistance were carried out. It was confirmed that the introduction of comonomer with a carboxyl group (MC or T m) to the aromatic poly- amides (31 or 3T) comprising 3,3'-diaminodiphenylsulfone was very effective for the improvement of its RO performance. In particular, 3T-MC(30), which was prepared &om terephthaloyl dichloride and mixed diamine components of3,3'-diaminodiphenyl- sulfone and 3,5-diaminobenzoic acid, exhibited not only some potential for sea water desalination (FR = 159 Um2 day, Rj = 98.3%) but also higher chlorine resistance than conventional Nomex-type aramid [MI-MC(O)]. @ 2001 John Wiley & Sons, Inc.