Syndiotactic polymerization of methyl methacrylate with Ni(acac)2-methylaluminoxane catalyst

被引：0
作者：
Liqiang Cui
Junsheng Yu
Yinghai Lv
Guijiang Li
Shixue Zhou
机构：
[1] University of Electronic Science and Technology of China (UESTC),State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information
[2] Shandong University of Science and Technology,College of Chemical and Environmental Engineering
来源：
Journal of Polymer Research | 2012年 / 19卷
关键词：
Methyl methacrylate; Ni(acac); -methylaluminoxane; Microstructure; Syndiotactic;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
In this study, syndiotactic-rich poly(methyl methacrylate) (PMMA) is obtained by using a soluble nickle acetylacetonate [Ni(acac)2] and modified methylaluminoxane (MMAO-3A) catalyst system under modest polymerization conditions. The main purpose of this work is concerned with the study of previous conflicting stereospecificity data. Types of MAO, temperature of polymerization, MAO/Ni(acac)2 (Al/Ni) mole ratio, and various solvents have been investigated in the MMA polymerization. Particularly, high syndiotactic PMMA [(rr) > 91 %] has been obtained when MMAO-3A is used as cocatalyst with Al/Ni ratio of ca. 50 or polymerization temperature ca. 0 °C. As expected, the prepared syndiotacticity-rich PMMA has a higher glass transition temperature (Tg) within 120 ~ 127 °C. The details of the polymerization mechanism, especially in relation to the stereoregularity problems are under investigation.
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