主链含杯[4]芳烃的PBT-PDMS共聚酯的合成及其对水中微量苯的分离性能研究

SYNTHESIS OF CALIX[4]ARENE CONTAINING PBT-PDMS COPOLYESTER AND ITS PROPERTY FOR SEPARATING BENZENE FROM ITS DILUTE AQUEOUS SOLUTION BY PERVAPORATION

合成了双官能化杯[4]芳烃衍生物,并通过共缩聚的方法制备了主链含杯[4]芳烃的聚对苯二甲酸丁二酯-聚二甲基硅氧烷(PBT-PDMS)共聚酯.利用1H-NMR,FTIR,SEC等手段表征了共聚物的组成及分子量.以此共聚物为膜材料,通过刮膜法制备了可用于渗透汽化的致密无孔分离膜,并用SEM表征了无孔膜的膜厚及截面结构.研究了温度和原始液浓度对渗透汽化的影响.该共聚物渗透气化膜分离水中微量苯的分离因子可达491,通量为58g/(m2h).

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 terephthalate calix[4]arene derivative PDMS. 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 μm. 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 100 × 10 -6 concentration at 40℃ .