粘度测定法研究两亲接枝共聚物PMMA-g-PEO在甲苯中的胶束化行为

The Research of Micellization of Amphiphilic Graft Coploymer PMMA-g-PEO in Toluene by Means of Viscometry Measurement

采用粘度测定法研究了规整性两亲接枝共聚物聚甲基丙烯酸甲酯 g 聚氧乙烯 (PMMA -g -PEO)在选择性溶剂甲苯中的胶束化行为 ,结果表明PMMA -g -PEO在甲苯中可形成胶束。体系的浓度、温度和结构决定了两亲接枝共聚物的聚焦态结构。随着温度的降低或浓度的升高PMMA -g -PEO在甲苯中分别以单分子、小胶束、大胶束的形式存在。在本实验范围内 ,温度越高、PEO含量越大、PEO接枝链越短、PMMA -g -PEO分子量越小、形成胶束的临界胶束化浓度 (CMC)

The micellization of well-defined amphiphilic graft copolymer poly(methy1 methacrylate)-g-ploy(ethylene oxide) is studied by means of viscometry measurement in selective solvent,toluene,Micelle can be formed in this system,and the conformation of amphiphilic graft coploymer is determined by temperature,concentration and structure of copolymer,with a increase in temperature or PEO content,as well as a decrease in PEO side chains length and copolymeric molecular weight,micelle can be formed in lower concentration.