Synthesis and characters of hyperbranched poly(vinyl acetate) by RAFT polymeraztion |
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Authors: | Xiaobo Zhou Jian Zhu Minying Xing Zhengbiao Zhang Zhenping Cheng Nianchen Zhou Xiulin Zhu |
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Affiliation: | Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science of Soochow (Suzhou) University, Suzhou 215123, China |
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Abstract: | Reversible addition-fragmentation chain transfer (RAFT) polymerization of VAc in the presence of ECTVA, which capable of both reversible chain transferable through a xanthate moiety and propagation via a vinyl group, led to highly branched copolymers by a method analogous to self-condensing vinyl polymerization (SCVP). The ECTVA acted as a vinyl acetate AB∗ inimer. It was copolymerized with vinyl acetate (VAc) in ratios selected to tune the distribution and length of branches of resulting hyperbranched poly(vinyl acetate). The degree of branching increased with chain ECTVA concentration, as confirmed by NMR spectroscopy. The polymer structure was characterized via MALDI–TOF. Retention of the xanthate compound during the polymerization was evidenced by successful chain extension of a branched (PVAc) macroCTA by RAFT polymerization. The branched PVAc led to better dissolution as compared to linear PVAc, an effect attributed primarily to an increased contribution of end groups. |
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Keywords: | Self-condensing vinyl polymerization (SCVP) Living polymerization Macromolecular design via interchange of xanthate (MADIX) Vinyl acetate |
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