Fe(0) Powder/CuBr2‐Mediated “Living”/Controlled Radical Polymerization of Methyl Methacrylate and Styrene at Ambient Temperature
Fe(0) Powder/CuBr2‐Mediated “Living”/Controlled Radical Polymerization of Methyl Methacrylate and Styrene at Ambient Temperature
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DOI：
10.1002/macp.201100545
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发表时间：
2012-02
影响因子：
2.5
通讯作者：
Lili Zhou;Zhengbiao Zhang;Zhenping Cheng;Nianchen Zhou;Jian Zhu;Wei Zhang-;Xiu-lin Zhu
中科院分区：
文献类型：
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作者：
Lili Zhou;Zhengbiao Zhang;Zhenping Cheng;Nianchen Zhou;Jian Zhu;Wei Zhang-;Xiu-lin Zhu
零价铁（Fe（0）粉末）和溴化铜（II）的组合用于在25 ° C下介导甲基丙烯酸甲酯（MMA）或苯乙烯（St）的聚合。结果表明，溶剂对聚合速率和分子量的控制起着重要作用。在甲苯中的聚合显示出控制不良的过程，具有显著低的聚合速率。以二甲基亚砜（DMSO）为溶剂，聚合反应在较高的反应速率下进行，特别是在较高的转化率下，聚合物的数均分子量得到控制。在25 °C下，在DMSO中可以实现St的高转化率（80%）和窄分子量分布。推测Fe（0）起着双重作用，既是活性自由基生成的活化剂，又是CuBr 2的还原剂。
The combination of zero-valent iron (Fe(0) powder) and copper(II) bromide was used to mediate the polymerization of methyl methacrylate (MMA) or styrene (St) at 25 ° C. The results demonstrated that the solvent played an important role on the polymerization rate and molecular-weight control. The polymerization in toluene displayed a poorly controlled process with remarkably low polymerization rate. With dimethyl sulfoxide (DMSO) as solvent, the polymerization proceeded in a relatively high rate, and the number-average molecular weights were controlled especially at higher conversion. High conversions (80%) of St could be achieved with narrow molecular weight distributions in DMSO at 25 °C. It was supposed that Fe(0) played a dual role, the activator for the generation of active radical and the reducing agent for CuBr2.