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通过原子转移自由基聚合法合成了三嵌段共聚物聚环氧乙烷-b-聚丙烯酸叔丁酯-b-聚苯乙烯[PEO45-bPtBAx-b-PSy(x=35、100;y≈140)]。通过体积排斥色谱法和核磁测试对嵌段共聚物化学结构和分子量及分子量分布进行了表征。结果表明:各共聚物结构明确,分子量分布较窄;采用两步分级自组装方法对所得样品进行了溶液自组装行为研究。通过透射电镜对嵌段共聚物自组装形成的胶束的形貌、尺寸进行了表征。结果表明:通过溶剂条件的改变,成功诱导球形胶束形成了二级组装体。改变PtBA段长度使得嵌段共聚物自组装聚集体由球形胶束转变为直径分布均匀,长度在500nm以内的占多数的胶束串。
Triblock copolymer polyethylene oxide-b-poly (t-butyl acrylate) -b-polystyrene [PEO45-bPtBAx-b-PSy (x = 35,100; y≈3) was synthesized by atom transfer radical polymerization 140)]. The chemical structure, molecular weight and molecular weight distribution of block copolymers were characterized by volume exclusion chromatography and nuclear magnetic resonance. The results showed that each copolymer has a well-defined structure and a narrow molecular weight distribution. The self-assembly behavior of the resulting samples was studied by a two-step grading self-assembly method. The morphology and size of micelles formed by self-assembly of block copolymer were characterized by transmission electron microscopy. The results showed that the spherical micelles were successfully induced to form secondary assembly by changing the solvent conditions. By changing the length of PtBA, the self-assembly aggregates of the block copolymer are transformed from spherical micelles into micelles with a uniform diameter distribution and a length of less than 500 nm.