取代茚基二价稀土配合物催化甲基丙烯-酸N,N-二甲胺乙酯的聚合Polymerization of(Dimethylamino)Ethyl Methacrylate Catalyzed by Substituted Indenyl Lanthanide(Ⅱ) Complexes
齐民华;沈琪;贾惠芳;陈小平;
摘要(Abstract):
研究了取代茚基二价稀土配合物(1-C5H9C9H6)2Yb(THF)2催化甲基丙烯酸-N,N-二甲胺乙酯的聚合。结果表明,配合物(1-C5H9C9H6)2Yb(THF)2作为单组分催化剂对甲基丙烯酸-N,N-二甲胺乙酯的聚合显示出较高的催化活性,反应温度、时间、催化剂用量及溶剂性质对聚合反应转化率和产物分子量有较大影响,在以甲苯为溶剂的催化体系中加入少量的极性溶剂THF,聚合活性有明显提高。其他几种取代茚基稀土配合物也显示出高的催化活性,其活性有下列次序:(1-C5H9C9H6)2Sm(THF)≈(1-C2H5C9H6)2Sm(THF)2>(1-C5H9C9H6)2Yb(THF)2>(1-PhCH2C9H6)2Sm(THF)2,二价钐配合物较二价镱的相应配合物具有较高的催化活性。聚合产物的分子量及分子量分布通过凝胶渗透色谱法表征,立构规整性由1H NMR谱表征,所得聚合物以间同立构为主。
关键词(KeyWords): 取代茚基;稀土配合物;甲基丙烯酸-N,N-二甲胺乙酯;聚合
基金项目(Foundation): 国家自然科学基金资助项目(20072027);; 茂名学院博士基金项目
作者(Authors): 齐民华;沈琪;贾惠芳;陈小平;
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