Amphiphilic Seven-arm Star Triblock Copolymers with Diverse Morphologies in Aqueous Solution Induced by Crystallization and pH |
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| Authors: | SUN Rui WANG Ying GOU Pengfei ZUO Min LI Xiaodong ZHU Weipu SHEN Zhiquan |
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| Institution: | 1. Department of Oral and Maxillofacial Surgery, Affiliated Stomatology Hospital, College of Medicine, Zhejiang University, Hangzhou 310006, P. R. China;
2. Key Laboratory of Macromolecular Synthesis and Functionalization, Ministry of Education, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China |
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| Abstract: | Well-defined amphiphilic seven-arm star triblock copolymers containing hydrophobic crystalline poly(ε-caprolactone)(PCL) blocks, hydrophobic non-crystalline poly(tert-butyl acrylate)(PtBA) blocks and hydrophilic poly(ethylene glycol)(PEG) blocks were precisely synthesized by a combination of ring-opening polymerization(ROP), atom transfer radical polymerization(ATRP) and “click” reaction. Such star copolymers could self-assemble into “core-shell-corona” micelles and “multi-layer” vesicles depending on the fraction of each block. Meanwhile, the selective hydrolysis of middle PtBA blocks into the poly(acrylic acid)(PAA) blocks allowed the star block copolymers to further change their morphologies of aqueous aggregates in response to pH values. |
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| Keywords: | Amphiphile Crystallization Hydrolysis Self-assembly Star block copolymer |
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