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Multicompartmental hollow micelles formed by linear ABC triblock copolymers in aqueous medium. 2013

Shaoliang Lin, and Wenjie Zhu, and Xiaohua He, and Yaohui Xing, and Liyuan Liang, and Tao Chen, and Jiaping Lin
Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.

Self-assembly behavior of an ABC triblock copolymer, poly(ethylene glycol)-b-polystyrene-b-poly(ε-caprolactone) (PEG-b-PS-b-PCL), in aqueous media is presented. The formed micelle structures were analyzed by using transmission electron microscopy, scanning electron microscopy, and laser light scattering. Various fascinating multicompartmental aggregates, including multilamellar vesicles, cylinder-containing vesicles, entrapped vesicles, and porous large compound micelles, were prepared from four copolymers with various block lengths of PEG and PS. The phase separation of hydrophobic PS and PCL blocks, as well as the hydrophilic/hydrophobic balance, plays a crucial role on the self-assembly behaviors. The mechanism regarding the formation of these fascinating aggregates is also suggested.

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