PTMSP及其共聚物膜对有机液/水体系的PV分离

制备了聚三甲基硅丙炔均聚物 (PTMSP) .研究了PTMSP均质膜 ,三甲基硅丙炔(TMSP)与五甲基二硅丙炔 (PMDSP)共聚物膜对含少量有机溶剂水溶液的渗透汽化 (PV )特性 .所选用的有机溶剂包括乙醇、异丙醇、四氢呋喃、二氯甲烷、乙酸乙酯等 .从膜的溶胀特性、溶解度系数及扩散系数的测定结果 ,分析了膜材质的结构与PV特性之间的关系 .

Organic permselective pervaporation characteristics of poly(silylpropyne) and copolymer dense membranes

An investigation into the organic permselective separationthrough poly(1-trimethylsilyl-1-propyne) (PTMSP) and (1-trimethylsilyl)-1-(1-penta-methyl-disilyl)-1-propyne copolymer(TMSP-PMDSP) dense membranes was made to gain an insight into the effect of the chemical structure of membrane materials on pervaporation (PV) characteristics. The results show that the copolymer has a higher separation factor αO/W but with a relatively lower value of flux J(g·m-2·h-1) than pure PTMSP. This phenomenon may be attributed to the introduction of side chains with large bulk volume in copolymer, which brought about a decrease of excess free volume and the improvement of diffusion selectivity to some extent. The copolymer membrane showed good performance for separating 1.37wt% dichloromethane/water liquid mixture at 35℃ and 100 Pa; the selectivity increased to 1684.7 while the value of flux was about 336.0g·m-2·h-1.