Highly syndiotactic poly(methyl methacrylate) with narrow molecular weight distribution formed by tert-butyllithium-trialkylaluminium in toluene
Highly syndiotactic poly(methyl methacrylate) with narrow molecular weight distribution formed by tert-butyllithium-trialkylaluminium in toluene
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DOI：
10.1007/bf00263663
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发表时间：
1988-12
期刊：
影响因子：
3.2
通讯作者：
T. Kitayama;T. Shinozaki;Eiji Masuda;Masanori Yamamoto;K. Hatada
中科院分区：
文献类型：
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作者：
T. Kitayama;T. Shinozaki;Eiji Masuda;Masanori Yamamoto;K. Hatada
以三烷基铝(烷基=甲基、乙基、丁基、异丁基和辛基)为催化剂，考察了不同Al/Li比下甲基丙烯酸甲酯与t-C4H9Li在甲苯中的聚合反应。三乙基铝、三丁基铝和三正辛基铝在Al/Li比为3和大于3的条件下均能有效地合成分子量分布较窄的间规型聚甲基丙烯酸甲酯。t-C4H9Li/(n-C8H17)3Al(1/3)催化剂在−为93°C时间规度最高，达96%。间规PMMA的结构与用t-C4H9MgBr制得的等规PMMA的化学结构相同。从而得到了分子量分布窄、化学结构从α端到ω端相同的高等规度和间规性PMMA。
Polymerization of MMA with t-C4H9Li in toluene in the presence of trialkylaluminum(alkyl=methyl, ethyl, butyl, isobutyl, and octyl) was examined at various Al/Li ratios. Triethyl-, tributyl and trioctylaluminums worked quite effectively in the polymerization to give highly syndiotactic PMMA with narrow molecular weight distribution (MWD) at the Al/Li ratio of 3 and higher than 3. The highest syndiotacticity of 96% was attained with t-C4H9Li/(n-C8H17)3Al (1/3) at −93°C. The polymerization was initiated by t-C4H9anion and proceeded in a living manner. The structure of the syndiotactic PMMA is chemically identical to that of isotactic PMMA prepared with t-C4H9MgBr. Consequently, highly isotactic and syndiotactic PMMAs with narrow MWD and with the same chemical structure from α-end to ω-end were obtained.