Methyl methacrylate, ethyl methacrylate, propyl methacrylate, and styrene were graft-polymerized onto the amorphous polyamide poly(hexamethylene terephthalamide/isophthalamide) (SELAR). Membranes were prepared from the modified SELAR and unmodified SELAR. The membranes were permeated benzene in preference to cyclohexane from benzene/cyclohexane mixtures by pervaporation. (C) 2003 Wiley Periodicals, Inc.