Hindered lithium dialkylamide initiators for the living anionic polymerization of methacrylic esters
Hindered lithium dialkylamide initiators for the living anionic polymerization of methacrylic esters
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用于甲基丙烯酸酯活性阴离子聚合的受阻二烷基酰胺锂引发剂
DOI：
10.1002/pola.1994.080321303
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
J. Mcgrath
中科院分区：
文献类型：
--
作者：
T. Long;R. A. Guistina;Brian Andrew Schell;J. Mcgrath
二异丙基酰胺锂是一种有效的引发剂，适用于 -78°C 极性溶剂中甲基丙烯酸甲酯的阴离子聚合。获得了基于引发剂浓度的可预测分子量，产率是定量的，并且分子量分布相对较窄（<1.30）。通过使用HClO 4 的电位滴定来确认氨基端基的存在和引发机制的确认。通过滴定测定的数均分子量与通过 SEC 测定的值非常吻合。其他含有较大烷基的二烷基氨基锂（例如二异丁基氨基锂）是效率较低的引发剂
Lithium diisopropylamide is an efficient initiator for the anionic polymerization of methyl methacrylate in polar solvents at -78°C. Predictable molecular weights based on the initiator concentration were obtained, yields were quantitative, and molecular weight distributions were relatively narrow (<1.30). The presence of an amino end group and confirmation of the initiation mechanism were confirmed by potentiometric titration using HClO 4 . Number-average molecular weights determined by titration agreed well with values determined by SEC. Other lithium dialkylamides that fontain larger alkyl groups such as lithium diisobutylamide were less efficient initiators