聚亚甲基-b-聚(N-异丙基丙烯酰胺)-b-聚苯乙烯三嵌段共聚物的合成及制备的有序多孔薄膜的性能

摘要

A series of well-defined polymethylene-b-p(N-isopropylacrylamide)-b-polystyrene(PM-b-PNIPAM-b-PS) triblock copolymers(Mn 6 100-25 200,Mw/Mn 1.18-1.32;Mn(PS segment) 1 350-18 000) with polymethylene as polyolefin segment and PNIPAM as temperature-responsive segment were synthesized via the combination of living polymerization of Ylides and reversible addition-fragmentation chain transfer polymerization.The self-assembly and temperature-responsive behaviors of such triblock copolymers in solution were investigated.The ordered porous films of such triblock copolymers were fabricated via static Breath-Figure process.The results showed that the spherical micelles of PM-b-PNIPAM-b-PS triblock copolymers with average pore size of 200 nm in water can be formed by self-assembly in THF/H20 solution and showed temperature-responsive properties.The PM-b-PNIPAM-b-PS triblock copolymers can be fabricated into ordered porous films with average pore sizes of 1.03 μm and 2.02 μm using CHCl3 as solvent at 22 ℃ under relative humidity of 95％.%将叶立德同源聚合与可逆加成-断裂链转移聚合相结合,设计合成了系列结构可控、组成可调的含有聚烯烃链段和温度响应性聚合物链段的共聚物,即聚亚甲基-b-聚(N-异丙基丙烯酰胺)-b-聚苯乙烯(PM-b-PNIPAM-b-PS)三嵌段共聚物(Mn=6 100～25200,Mw/Mn=1.18～ 1.32,PS链段Mn=1 350～ 18 000),研究了共聚物在溶液中的自组装性质和温度响应性,并利用静态呼吸图法制备了该三嵌段共聚物的有序多孔薄膜.实验结果表明,所制备的PM-b-PNIPAM-b-PS三嵌段共聚物在THF/H20中自组装,于水溶液中形成平均粒径为200 nm的球形胶束,且具有温度响应性.以氯仿为溶剂、22℃、95％湿度条件下,PM-b-PNIPAM-b-PS三嵌段共聚物可制得到孔径均一(平均直径为1.03μm和2.02/μm)的有序多孔薄膜.