摘要
报道一种新的复合Ｚｉｅｇｌｅｒ－Ｎａｔａ催化剂—［（ＣＯ）２ＦｅＣｐ］２／［（ＣＨ３）２Ｓｉ（ＣｐＭｅ）２ＹＣｌ］２／Ａｌ（ｉ－Ｂｕ）３催化甲基丙烯酸甲酯（ＭＭＡ）聚合的结果．研究了ＭＭＡ／（Ｙ＋Ｆｅ）摩尔比、Ａｌ／（Ｙ＋Ｆｅ）摩尔比及反应温度对聚合的影响．结果表明，该催化剂具有较高的活性和较长的活性寿期，也许与复合催化协同效应有关．提高温度有利于聚合反应，在５０℃得到了间同结构为６７％左右的ＰＭＭＡ．
A new mixed catalyst composed of [(CO) 2FeCp] 2 and [(CH 3) 2Si(CpMe) 2YCl] 2 with Al(i Bu) 3 has been succssfully developed for the polymeriation of methyl methacrylate(MMA).The affection to polymerization ,which is caused by the molar ratio of MMA/(Y+Fe),Al/(Y+Fe) and temperature,was studied in some detail. The results showed that this catalyst has higher catalytic activity and longer life of active center,which may be related with the cooperated action of two various metallocenes.Higher temperature is favourable to the polymerization.The syndiotactic content of PMMA is about 67.0%.
基金
国家自然科学基金
中科院长春应用化学研究所稀土化学与物理开放室资助
关键词
茂金属催化剂
复合催化剂
聚合
甲基丙烯酸甲酯
Metallocene catalyst
Ziegler Natta catalyst
mixed catalyst
polymerization
methyl methacrylate
