高通量超支化聚硅氧烷复合膜渗透汽化分离水中正丁醇

摘要

为得到高通量的水中脱除丁醇渗透汽化膜HPSiO-c-PDMS,采用AB2型单体缩合法合成了超支化聚硅氧烷(HPSiO)并将其与端羟基聚二甲基硅氧烷(PDMS)交联制备渗透汽化复合膜.对超支化聚硅氧烷和HPSiO-c-PDMS膜进行了化学结构和形态表征,并系统研究了PDMS分子量大小对膜结构及其渗透汽化性能的影响.结果表明:超支化聚合物支化度(DB)达到0.73；HPSiO-c-PDMS膜具有较大的通量和分离因子,随着PDMS分子量的增加,其渗透通量减小而分离因子增加.%Hyperbranched polysiloxane was prepared with a one-pot polymerization process of AB2 type monomer,which was used to fabricate a pervaporation membrane,HPSiO-c-PDMS membrane,to recover n-butanol from aqueous solution.The chemical structure and morphology of the hyperbranched polysiloxane and HPSiO-c-PDMS membrane were characterized.In addition,the effect of molecular weight of PDMS on the chain structures and pervaporation performance of HPSiO-c-PDMS membranes were also systematically studied.The results indicated the degree of branching (DB) of hyperbranched polysiloxane was 0.73 and HPSiO-c-PDMS membrane has large flux and separation factor.With increasing of the molecular weight of PDMS,the separation factor increased and total flux decreased.