Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
Langmuir. 2010 Feb 16;26(4):2791-7. doi: 10.1021/la902834m.
The self-assembly behavior of poly(gamma-benzyl-L-glutamate)-graft-poly(ethylene glycol) rod-coil graft copolymers in aqueous solution was investigated. With tetrahydrofuran (THF) as initial solvent, vesicles were observed for the graft copolymers with lower degree of grafting. When the degree of grafting increases, the aggregate morphology transforms from vesicles to spindle-like micelles then to spherical micelles. When N,N'-dimethylformamide (DMF) is introduced into the initial solvent, the vesicles transform to spindles. Increasing DMF volume fraction leads to a spindle to connected-spindle transition. On the basis of the experimental results, the mechanism of the morphological transition of the rod-coil graft copolymer is suggested.
聚（γ-苄基-L-谷氨酸）-接枝-聚乙二醇棒-线接枝共聚物在水溶液中的自组装行为进行了研究。以四氢呋喃（THF）为初始溶剂，对于接枝率较低的接枝共聚物，观察到了囊泡。当接枝率增加时，聚集形态从囊泡转变为纺锤形胶束，然后转变为球形胶束。当将 N，N'-二甲基甲酰胺（DMF）引入初始溶剂中时，囊泡转变为纺锤体。增加 DMF 体积分数会导致纺锤体到连接纺锤体的转变。根据实验结果，提出了棒-线接枝共聚物形态转变的机制。
