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《Polymer Materials Science & Engineering》 2011-08
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Synthesis of Four-Arm Star-Shaped Copolymers Poly(Ethylene Oxide)-b-Poly(N-Isopropylacrylamide)

Wen Yang,Xiaoyan Zhang,Peng Fu,Qingxiang Zhao,Minying Liu,Yudong Wang(College of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China)  
a series of four-arm star-shaped block copolymers poly(ethylene oxide)-b-poly(N-isopropyl-acrylamide)(PEO4-b-PNIPAAm4) were synthesized by a combination of reversive addition-fragmentation chain transfer polymerization(RAFT) and anionic ring-opening polymeration(AROP).Firstly,the four-arm star-shaped PEO4 was prepared by AROP of EO.Then,PEO4 was esterified by reaction with S-1-dodecyl-S′-(α,α′-dimethyl-α″-acetic acid)trithio-carbonate)(DDAT),and then used as RAFT macroinitiator to initiate polymerization of NIPAAm.And a series of four-arm star-shaped copolymers PEO4-b-PNIPAAm4 were obtained.The structure and molecular weights of every segment of the star-shaped block copolymer were controllable,and the polydispersity was narrow.The final product and intermediate were characterized by 1H nuclear magnetic resonance spectrum(1H-NMR)and gel permeation in chromatography(GPC) in details.
【Fund】: 河南省杰出青年科学基金资助项目(74100510025);; 河南省教育厅自然科学基金资助项目(2009A430018)
【CateGory Index】: O631.3
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