Abstract
The preparation of asymmetric flat membranes from a series of novel aromatic polyamides comprising 3,3′-diaminodiphenylsulfone and a comonomer with a carboxyl group(BCOOH) 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 Tm) to the aromatic polyamides (3I or 3T) comprising 3,3′-diaminodiphenylsulfone was very effective for the improvement of its RO performance. In particular, 3T-MC(30), which was prepared from terephthaloyl dichloride and mixed diamine components of 3,3′-diaminodiphenylsulfone and 3,5-diaminobenzoic acid, exhibited not only some potential for sea water desalination (FR = 159 L/m2 day, Rj = 98.3%) but also higher chlorine resistance than conventional Nomex-type aramid [MI-MC(0)]. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 505–513, 2001
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