Studies on the Second Aggregation Behavior of Primary Aggregates from BAB Triblock Copolymers with a Hydrophilic Middle Block A in Aqueous Media

Abstract

Abstract: The second aggregation behavior of spherical micelles, spherical vesicles and worm-like micelles made from PS₄₃-b-PEO₄₅-b-PS₄₃ and PS₃₉-b-P4VP₉₈-b-PS₃₉ triblock copolymers was investigated by conventional Transmission Electron Microscope(TEM) and Atomic Force Microscope(AFM) techniques. It was observed that the second aggregation behaved the different complexity for different primary aggregates. For the symmetrical primary aggregates, such as spherical micelles and vesicles, the second aggregates displayed a symmetrical sphere. In contrast, for the unsymmerical worm-like primary micelles, the second aggregation tended to have an unsymmetrical shape. The BAB chain architecture was molecularly suggested to be responsible for the second aggregation.

Key words: Block copolymer, Self-assembly, Second aggregation, Vesicle

CLC Number:

O631

TrendMD:

YUAN Jian-Jun, YANG Zi-Gang, CHENG Shi-Yuan, JIANG Lei, FENG Lin-Xian, FAN Zhi-Qiang . Studies on the Second Aggregation Behavior of Primary Aggregates from BAB Triblock Copolymers with a Hydrophilic Middle Block A in Aqueous Media[J]. Chem. J. Chinese Universities, 2004, 25(1): 166.

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Studies on the Second Aggregation Behavior of Primary Aggregates from BAB Triblock Copolymers with a Hydrophilic Middle Block A in Aqueous Media

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