Radical polymerization in the presence of peroxide and reducing agent monomer for branched polymers
Radical polymerization in the presence of peroxide and reducing agent monomer for branched polymers
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DOI：
10.1002/pola.29334
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发表时间：
2019-04
期刊：
影响因子：
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通讯作者：
Qimin Jiang;Yongzhuang Du;Wenyan Huang;Jian-hai Chen;Hongjun Yang;X. Xue;Li Jiang;B. Jiang
中科院分区：
文献类型：
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作者：
Qimin Jiang;Yongzhuang Du;Wenyan Huang;Jian-hai Chen;Hongjun Yang;X. Xue;Li Jiang;B. Jiang
在这篇文章中，我们报告的自由基聚合在过氧化物和商业上可获得的或设计的还原剂单体（RAM）的存在下制备支化聚（甲基丙烯酸甲酯）（PMMA）。用NMR研究了RAM的反应行为。使用三重检测SEC（TD-SEC）分析来确认制备的PMMA的支化结构，并研究过氧化物浓度和RAM浓度对分子量和支化结构的影响。在高转化率下，所得支化PMMA具有较高的分子量和较窄的多分散性。有趣的是，在更高的BPO浓度下观察到所得聚合物的分子量和支化度显著增加，这些结果与文献报道的结果完全不同。RAM/BPO氧化还原引发的自由基聚合体系中独特的自由基聚合机理导致在相对高的RAM和BPO浓度下具有高分子量的支化PMMA。© 2019 Wiley Periodicals，Inc. J. Polym.科学，A部分：聚合物化学2019，57，833-840
In this article, we report the radical polymerization in the presence of peroxide and commercially available or designed reducing agent monomer (RAM) for the preparation of branched poly(methyl methacrylate)s (PMMAs). The reaction behavior of the RAM was studied by NMR. Triple‐detection SEC (TD‐SEC) analysis was used to confirm the branching structure of the prepared PMMAs and to investigate the influence of peroxide concentration and RAM concentration on molecular weight and branched structure. The obtained branched PMMAs exhibited high molecular weights and relatively narrow polydispersities at high conversion of MMA. Interestingly, a significant increase in molecular weight and degree of branching of the obtained polymers are observed in higher BPO concentration, these results are quite different from that reported in the literature. The unique radical polymerization mechanism in the RAM/BPO redox‐initiated radical polymerization system resulted in branched PMMAs with high molecular weights at relatively high RAM and BPO concentrations. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem.2019,57, 833–840