Preparation of PMMA macromers by o-vinylbenzylmagnesium chloride and their polymerization
Preparation of PMMA macromers by o-vinylbenzylmagnesium chloride and their polymerization
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邻乙烯基苄基氯化镁制备PMMA大分子单体及其聚合
DOI：
10.1007/bf00255377
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发表时间：
1988
期刊：
影响因子：
3.2
通讯作者：
T. Kitayama
中科院分区：
文献类型：
--
作者：
K. Hatada;T. Shinozaki;K. Ute;T. Kitayama
研究了甲基丙烯酸甲酯与邻乙烯基苄基氯化镁在甲苯和四氢呋喃（THF）中不同温度下的聚合。在-78 °C的甲苯中形成的聚合物是高度全同立构的（mm=94%），在链的α-末端含有一个乙烯基苄基，尽管同时形成的甲醇可溶部分的全同立构程度较低。在-78 °C和-98 °C的THF中形成的PMMAs大部分是甲醇可溶性的，并且高度间同立构（在-78 °C时rr=88%，在-98 °C时rr = 96%），并且还包含一个乙烯基苄基。在甲苯中，在60°C下，通过AIBN使甲醇可溶的全同立构和间同立构PMMA大分子单体与苯乙烯聚合或共聚。全同立构大分子单体的反应活性略高于间同立构大分子单体。
Polymerization of MMA with o-vinylbenzylmagnesium chloride was examined in toluene and in tetrahydrofuran (THF) at various temperatures. The polymer formed in toluene at −78°C was highly isotactic (mm=94%) and containing one vinylbenzyl group at the α-end of the chain, although the methanol-soluble fraction concomitantly formed in an appreciable amount was less isotactic. The PMMAs formed in THF at −78 and −98°C were mostly methanol-soluble and highly syndiotactic (rr=88% at −78°C and 96% at −98°C), and also contained one vinylbenzyl group. The methanol-soluble, isotactic and syndiotactic PMMA macromers were polymerized or copolymerized with styrene by AIBN in toluene at 60°C. The isotactic macromer exhibited slightly higher reactivity than the syndiotactic one.