Living polymerization of epoxides with metalloporphyrin and synthesis of block copolymers with controlled chain lengths
Living polymerization of epoxides with metalloporphyrin and synthesis of block copolymers with controlled chain lengths
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DOI：
10.1021/ma50006a004
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发表时间：
1981-09
期刊：
影响因子：
5.5
通讯作者：
T. Aida;S. Inoue
中科院分区：
文献类型：
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作者：
T. Aida;S. Inoue
已发现5，10，15，20-四苯基卟啉-二乙基氯化铝双酯可分解环氧乙烷、环氧丙烷和1，2-环氧丁烷，产生具有窄分子量分布的“活性”聚合物。由这些环氧化物可以合成具有非常高的嵌段效率（几乎100%）的二元和三元嵌段共聚物。封闭链的长度可以通过改变反应单体的量来控制。嵌段共聚物的特征还在于窄的分子量分布。“活性”聚合在制备窄分子量分布聚合物和嵌段长度明确的嵌段共聚物中具有重要意义。然而，实例主要限于非极性乙烯基单体的聚合。在环氧化合物的开环聚合中，只有环氧乙烷在碱性催化剂作用下能形成活性聚合物。
The 5, 10, 15, 20-tetraphenylporphine-diethylaluminum chloridesystem has been found to polymerize ethylene oxide, propylene oxide, and 1, 2-butene oxide to produce “living” polymers having narrow molecular weight distributions. Binary and ternary block copolymers could be synthesized from these epoxides with very high blocking efficiency (almost 100%). The length of the blocked chain could be controlled by changing the amounts of the monomers reacted. The block copolymers are also characterized by a narrow molecular weight distribution.“Living” polymerization is of great importance in the preparation of polymers with narrow molecular weight distributions and blockcopolymers with well-defined block lengths. However, examples have been limited mainlyto polymerization of nonpolar vinyl monomers. As for ringopening polymerization of epoxides, only ethylene oxide was reported to form living polymer with some alkaline catalysts.