利用Pluronic嵌段共聚物的增溶胶束超滤分离技术

增溶胶束超滤 (MEUF)是新型膜分离技术 ,但迄今仅利用普通烷烃链表面活性剂作为其胶束物质 ,由于这些表面活性剂单体相对分子质量低 ,形成的胶束较小 ,不仅难以有效增溶有机分子 ,还可能透过超滤膜造成对水体的二次污染。聚氧乙烯 -聚氧丙烯 -聚氧乙烯三嵌段共聚物 (Pluronics)是一类重要的功能高分子 ,在合适条件下 ,它们在水溶液中聚集生成具有很大内核的胶束 ,这种胶束能有效增溶水溶液中的有机污染物。其次 ,Pluronic共聚物分子单体的大相对分子质量使其容易被超滤膜隔离 ,加上Pluronic共聚物无毒无刺激性 ,因而这类新型功能高分子适合用于增溶胶束超滤方法 ,实现对水体有机污染物的分离。综述Pluronic嵌段共聚物的胶束化、胶束结构、胶束增溶以及在增溶胶束超滤分离技术中的应用

Micella-enhanced Ultrafiltration Using Pluronic Triblock Copolyer Micelle

Triblock copolymers of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO),often denoted by PEO-PPO-PEO,are commercially available nonionic macromolecular surfactants with special functions.A number of triblock copolymers have been shown to aggregate in the form of micell,with a core presumably dominated by PPO and a corona dominated by hydrated PEO blocks.Such a core of micelle is extremely attractive to nonpolar solutes.In addition,molecules of the triblock copolymer with large molecular weight can be easily separated by hollow fiber membrane and thus secondary fluid pollution is avoided.Therefore,PEO-PPO-PEO block copolymers are suitable for use in micella enhanced ultrafiltration.This article reviews the micellization,the micella structure and the micella solubilization of PEO-PPO-PEO triblock copolymers.Application of the micelle of PEO-PPO-PEO triblock copolymers in micella enhanced ultrafiltration is then introduced.