Three different copolymers of acrylamide ( AM) with increasing amounts of 2-hydroxyethyl methacrylate ( HEMA), i.e., PAMHEMA-1, PAMHEMA-2, and PAMHEMA-3, were synthesized and the crosslinked ( gelled) copolymer membranes that were made from these sol copolymer solutions ( uncrosslinked) were used for pervaporative dehydration of dimethyl formamide ( DMF) over the concentration range of 0-13.07 wt % water in feed. These hydrophilic gel copolymer membranes were found to be highly water-selective in both sorption and diffusion through the membranes. The water flux was found to decrease with an increasing degree of crosslinking from PAMHEMA-1 to PAMHEMA-3 membranes. Among the three membranes, the PAMHEMA-3 membrane showed the highest separation factor ( 464.3) and reasonable flux ( 23.91 g/( m(2) h) for 0.5 wt % of water in the feed) for water, whereas the maximum water flux with high separation factor was exhibited by the PAMHEMA-1 membrane ( 47.45 g/( m(2) h) and 263.8 for 0.5 wt % of water in the feed) at 30 degrees C. When the pervaporation ( PV) experiment was performed at 50 C, the flux was observed to increase manifold with little change in the separation factor ( 51.03 g/( m(2) h) and 369.6 for 0.5 wt % of water in the feed for the PAMHEMA-3 membrane).