Hydroxyl terminated polybutadiene (HTPB) based polyurethane (PU)-fluoropolymer interpenetrating polymer network (IPN) membrane was prepared to improve the permeation flux of HTPB based PU for pervaporation recovery of butanol. The IPN was characterized by FTIR, TGA, SEM and WCA. With a separation membrane thickness of 21 mu m, the membrane obtained a total flux of 7.03 with a separation factor of 452.6 g/m(2)h at 70 A degrees C, the permeation flux improved greatly while the separation factor decreased in comparison with HTPB based PU.