单组分稀土聚合催化剂研究进展

以 77篇代表性文献综述了单组分稀土聚合催化剂的最新进展 ,重点介绍这一催化剂的主要特征 ,并指出了有待解决的几个问题。

单组分桥联茂基二异丙胺基钕配合物催化甲基丙烯酸甲酯聚合

The polymerization of MMA catalyzed by bridged lanthanocene amide as single compoent catalyst has been investigated. The polymers obtained were characterized by GPC, FT IR, 1H NMR and DSC. The results indicated that the conversion and the molecular weight decreased with decrease in polymerization temperature. The PMMA obtained was mainly in syndiotactic structure.

均相稀土催化苯乙烯均聚及其与异戊二烯共聚

采用新型稀土催化体系氯代三氟乙酸钕（Ｎｄ）－烷基铝（Ａｌ）－卤代烃（Ｘ），引发苯乙烯（Ｓｔ）均聚及其与异戊二烯（Ｉｐ）共聚。研究了催化体系各组分及陈化方式、Ｘ和Ａｌ种类及用量、溶剂种类等因素对苯乙烯聚合的影响，并用稀土催化剂实现了Ｓｔ－Ｉｐ嵌段共聚。用ＩＲ，ＮＭＲ及ＤＳＣ等方法表征了聚合物的结构，合成出的Ｓｔ－Ｉｐ二嵌段共聚物中，Ｉｐ链节以反式－１，４－结构为主，含少量３，４－结构，几乎不含顺式－１，４－结构。