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研究了一系列具有不同链段长度和组成的聚4-乙烯基吡啶-聚苯乙烯-聚4-乙烯基吡啶多嵌段共聚物(P4VP-b-PS-b-P4VP)n在其选择性溶剂甲苯和pH<3的水中的胶束化过程,主要研究了多嵌段共聚物链段长度、溶液浓度和溶剂对其胶束形态的影响.透射电镜和原子力显微镜结果表明随着P4VP段链的相对增长,多嵌段共聚物在甲苯中的胶束形态由蠕虫链状向短棒状到球状胶束变化,而其在pH<3的水溶液中均形成球形胶束.由于特殊的链结构,聚合物的浓度对(P4VP-b-PS-b-P4VP)n多嵌段共聚物的胶束行为和胶束形态有着重要的影响.同时,(P4VP-b-PS-b-P4VP)n多嵌段共聚物分子量分布的多分散性对其在选择性溶剂中的胶束形态也有所影响.
A series of poly (4-vinylpyridine) -poly (4-vinylpyridine) block copolymers (P4VP-b-PS-b-P4VP) n with different chain lengths and compositions were studied for their selectivity Solvent toluene and pH <3 micelles, the main study of the multi-block copolymer segment length, the concentration of the solution and the solvent on the morphology of micelles.Transmission electron microscopy and atomic force microscopy results show that with P4VP segment chain , The micelles morphology of multiblock copolymer in toluene changed from worm chain to short rod to spherical micelles, while spherical micelles formed in aqueous solution at pH <3. Owing to the special chain structure, The concentration of polymer (P4VP-b-PS-b-P4VP) n multiblock copolymer has an important effect on the micellar behavior and micellar morphology. The polydispersity of the block copolymer molecular weight distribution also affects its micelle morphology in selective solvents.