Amphiphilic Seven-arm Star Triblock Copolymers with Diverse Morphologies in Aqueous Solution Induced by Crystallization and pH

doi:10.1007/s40242-017-7218-3

Chemical Research in Chinese Universities ›› 2018, Vol. 34 ›› Issue (1): 132-137.doi: 10.1007/s40242-017-7218-3

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Amphiphilic Seven-arm Star Triblock Copolymers with Diverse Morphologies in Aqueous Solution Induced by Crystallization and pH

SUN Rui², WANG Ying¹, GOU Pengfei², ZUO Min², LI Xiaodong¹, ZHU Weipu², SHEN Zhiquan²

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

Received:2017-06-23 Online:2018-02-01 Published:2018-01-20
Contact: WANG Ying,E-mail:306174@zju.edu.cn;ZHU Weipu,E-mail:zhuwp@zju.edu.cn E-mail:306174@zju.edu.cn;zhuwp@zju.edu.cn
Supported by:
Supported by the Distinguished Young Investigator Fund of Zhejiang Province, China(No.LR18B040001), the National Natural Science Foundation of China(No.51603180), the Fundamental Research Funds for the Central Universities, China (No.2017QNA4038) and the China Postdoctoral Science Foundation(No.2015M580517).

Abstract

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.

Key words: Amphiphile, Crystallization, Hydrolysis, Self-assembly, Star block copolymer

SUN Rui, WANG Ying, GOU Pengfei, ZUO Min, LI Xiaodong, ZHU Weipu, SHEN Zhiquan. Amphiphilic Seven-arm Star Triblock Copolymers with Diverse Morphologies in Aqueous Solution Induced by Crystallization and pH[J]. Chemical Research in Chinese Universities, 2018, 34(1): 132-137.

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Amphiphilic Seven-arm Star Triblock Copolymers with Diverse Morphologies in Aqueous Solution Induced by Crystallization and pH

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