Synthesis and characters of hyperbranched poly(vinyl acetate) by RAFT polymeraztion

Synthesis and characters of hyperbranched poly(vinyl acetate) by RAFT polymeraztion
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RAFT聚合超支化聚醋酸乙烯酯的合成及性能

DOI:
10.1016/j.eurpolymj.2011.07.002
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发表时间:
2011-10
影响因子:
6
通讯作者:
Zhu, Xiulin
Zhu, Xiulin
中科院分区:
化学2区
文献类型:
--
作者:
Zhu, Jian;Xing, Minying;Cheng, Zhenping;Zhou, Nianchen;Zhou, Xiaobo;Zhang, Zhengbiao;Zhu, Xiulin

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在ECTVA存在下,VAc的可逆加成-断裂链转移(RAFT)聚合,其能够通过黄原酸酯部分可逆链转移和通过乙烯基增长,通过类似于自缩合乙烯基聚合(SCVP)的方法导致高度支化的共聚物。ECTVA充当乙酸乙烯酯AB异构体。将其与乙酸乙烯酯(VAc)以选择的比例共聚以调节所得超支化聚(乙酸乙烯酯)的支链的分布和长度。支化度随链ECTVA浓度增加,如NMR光谱所证实。通过MALDI-TOF表征聚合物结构。在聚合过程中的黄原酸酯化合物的保留证明了通过RAFT聚合的支链(PVAc)macroCTA的成功扩链。与线性PVAc相比,支化PVAc导致更好的溶解,这种效果主要归因于端基贡献的增加。
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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