A cyclic selenium‐based reversible addition‐fragmentation chain transfer agent mediated polymerization of vinyl acetate
A cyclic selenium‐based reversible addition‐fragmentation chain transfer agent mediated polymerization of vinyl acetate
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DOI：
10.1002/pola.26539
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发表时间：
2013-04
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影响因子：
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通讯作者：
Yiyu Zhan;Zhengbiao Zhang;Xiangqiang Pan;Jian Zhu;Nianchen Zhou;Xiu-lin Zhu
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文献类型：
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作者：
Yiyu Zhan;Zhengbiao Zhang;Xiangqiang Pan;Jian Zhu;Nianchen Zhou;Xiu-lin Zhu
合成了一种含硒环状可逆加成-断裂链转移（RAFT）试剂5，5-二甲基-3-苯基-2-硒氧-1，3-硒唑烷-4-酮（RAFT-Se），并将其用于醋酸乙烯酯（VAc）的RAFT聚合。其类似物5，5-二甲基-3-苯基-2-硫代噻唑烷-4-酮（RAFT-S）也用于RAFT聚合，以在相同条件下进行比较。VAc与RAFT-Se的RAFT聚合受到适度控制，这通过分子量随转化率的增加而增加来证明，尽管Mw/Mn略高（小于1.90），而分子量在RAFT-S的存在下受到不良控制（2.00 <Mw/Mn< 2.30）。由于RAFT-Se的不寻常的环状结构，一个或多个RAFT-Se物质被引入到所得的聚（VAc）中，如聚合物的裂解和原子吸收光谱的结果所揭示的。考虑到聚醋酸乙烯酯和硒元素的生物相关功能，这项工作无疑提供了一个成功的方法，如何将高含量的硒到一个分子量控制的聚醋酸乙烯酯。© 2013 Wiley Periodicals，Inc. J Polym Sci Part A：Polym Chem，2013
A cyclic selenium‐based reversible addition‐fragmentation chain transfer (RAFT) agent, 5,5‐dimethyl‐3‐phenyl‐2‐selenoxo‐1,3‐selenazolidin‐4‐one (RAFT‐Se), was synthesized and utilized in the RAFT polymerizations of vinyl acetate (VAc). Its analog, 5,5‐dimethyl‐3‐phenyl‐2‐thioxothiazolidin‐4‐one (RAFT‐S), was also used in RAFT polymerizations for comparison under identical conditions. The RAFT polymerizations of VAc with RAFT‐Se were moderately controlled evidenced by the increase of molecular weights with conversion, despite the slightly highMw/Mn(less than 1.90), whereas the molecular weights were poorly controlled in the presence of RAFT‐S (2.00 <Mw/Mn< 2.30). Thanks to its unusual cyclic structure of RAFT‐Se, one or more RAFT‐Se species was incorporated into the resultant poly(VAc) as revealed by the results of cleavage of polymer and atomic absorption spectroscopy. Considering the biorelated functions of both poly(VAc) and Se element, this work undoubtedly provided a successful methodology of how to incorporate high content of Se into a molecular weight controlled poly(VAc). © 2013 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013