Abstract:

ZSM-5-filled hydroxyl terminated polybutadiene（HTPB）-based polyurethane（PU）membranes（PU-ZSM-5），were prepared by a two-step polymerization process，and were used as membrane material to recover，isopropyl acetate（IPAC），from aqueous solution by pervaporation（PV）. The chemical structure，morphology and thermal stability of these filled membranes were characterized. The effects of ZSM-5 content on swelling degree and pervaporation performance were investigated. The results indicated that the incorporation of the ZSM-5 improved the thermal stability of the membranes apparently was compatible with the membranes. The swelling degree of the ZSM-5-?lled PU membranes decreased compared with that of PU membrane without ZSM-5，and with the increase of ZSM-5 content，the separation factor increased initially and then decreased. The PU-ZSM-5 membranes containing 20% ZSM-5 showed the highest separation factor for 1% IPAC in feed at 303K. With increasing operating temperature and feed concentration，both permeation ?ux and separation factor increased. The best PV performance of the PU-ZSM-5 membranes containing 20% ZSM-5，separation factor and total ?ux 288.72 g/(m²×h) and 53.21 g/(m²×h)，respectively was achieved with feed concentration of 1wt% IPAC at 333 K.