Preparation of highly isotactic and syndiotactic poly(methyl methacrylate) macromonomers having the same chemical structure and their polymerization
Preparation of highly isotactic and syndiotactic poly(methyl methacrylate) macromonomers having the same chemical structure and their polymerization
复制标题
具有相同化学结构的高全同立构和间同立构聚甲基丙烯酸甲酯大单体的制备及其聚合
DOI：
10.1007/bf00266168
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发表时间：
1989
期刊：
影响因子：
3.2
通讯作者：
Masanori Yamamoto
中科院分区：
文献类型：
--
作者：
K. Hatada;T. Kitayama;K. Ute;Eiji Masuda;T. Shinozaki;Masanori Yamamoto
摘要在-78°C 甲苯中用 t-C4H9MgBr 制备的高度全同立构的活性聚甲基丙烯酸甲酯 (PMMA) 阴离子在六甲基磷酰胺或 1,8-二氮杂双环[5.4.0]-undec-7-ene 存在下与对溴甲基苯乙烯 (p-BMST) 进行定量反应，得到具有窄分子量分布的 PMMA 大分子单体。在四甲基乙二胺存在下，p-BMST 与 t-C4H9Li-(n-C4H9),Al (Al/Li=3) 引发形成的活性 PMMA 阴离子反应，制备了高度间同立构 PMMA 大分子单体。对这些大分子单体的自由基聚合和共聚进行了一些详细的研究。结果表明，等规PMMA大单体的反应活性高于间规PMMA大单体。
SummaryHighly isotactic living poly(methyl methacrylate) (PMMA) anion prepared with t-C4H9MgBr in toluene at −78°C reacted quantitatively with p-bromomethylstyrene (p-BMST) in the presence of hexamethylphosphoramide or 1,8-diazabicyclo[5.4.0]-undec-7-ene to give the PMMA macromonomer with narrow molecular weight distribution. Highly syndiotactic PMMA macromonomer was also prepared by the reaction of p-BMST and the living PMMA anion formed by t-C4H9Li-(n-C4H9),Al (Al/Li=3) initiation in the presence of tetramethylethylenediamine. Radical polymerization and copolymerization of these macromonomers were studied in some detail. The results showed the higher reactivity of the isotactic PMMA macromonomer than the syndiotactic one.