Novel double functionalized calix［4］arene derivative has been synthesized and used for the preparation of calix［4］arene containing PBTPDMS copolyester by polycondensation with hydroxy terminated poly(dimethylsiloxane)

dimethyl terephthalate and 1

4-butanediol.1H\|NMR spectrum shows that the copolyester was comprised of calix［4］arene units

PBT and PDMS segments

which were linked by the 1

4-butanediol.The copolymerization efficiency of the comonomers was in the sequence of dimethyl terephthalatecalix［4］arene derivativePDMS.The weight average molecular weight of the copolyester was about 26000 Da

and the molecular weight distribution index was 1.9.A composite membrane of three-layer structure was prepared by casting the 21.2 wt% copolyester solution

in toluene onto a non-woven fabric supported microporous PAN membrane

and drying under reduced pressure.The SEM micrograph of the membrane shows that the thickness of the copolyester coating was about 90 m.The pervaporative removal of benzene from its dilute aqueous solution was studied using this composite membrane at different temperatures and original benzene concentrations.Due to the incorporation of calixarene units with adsorptive capability towards benzene moleculars the pervaporation membrane was excllent for benzene separation from dilute aqueous solution;the separation factor was 491 and benzne permeate flux 58 g/(m2h) using 10010-6 concentration at 40℃.