Use of polyiminophosphazene bases for ring-opening polymerizations
Use of polyiminophosphazene bases for ring-opening polymerizations
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DOI：
10.1002/masy.19961070131
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发表时间：
1996-04-01
影响因子：
--
通讯作者：
Moller, M
中科院分区：
文献类型：
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作者：
Esswein, B;Molenberg, A;Moller, M
聚亚氨基磷腈碱Et-P-2和t-Bu-P-4用作环氧乙烷和硅氧烷聚合的促进剂。由醇与t-Bu-P-4组合引发导致八甲基环四硅氧烷的极其快速的聚合反应。在环氧乙烷的情况下，得到了定义明确的聚合物，然而，在聚合反应过程中，聚合速率下降，由于分解的counterparts.In组合与有机锂化合物，磷腈碱导致定义明确的聚合物的情况下，环三硅氧烷以及环氧乙烷的情况下。
The polyiminophosphazene bases Et-P-2 and t-Bu-P-4 were used as a promoter for ethylene oxide and siloxane polymerizations. Initiation by an alcohol in combination with t-Bu-P-4 lead to an extremely rapid polymerization reaction of octamethylcyclotetrasiloxane. In the case of ethylene oxide, well-defined polymers were obtained, however the rate of polymerization decreased during the polymerization reaction due to decomposition of the counterion.In combination with organolithium compounds, the phosphazene bases lead to well-defined polymers in the case of cyclotrisiloxanes as well as in the case of ethylene oxide.