Ring-opening polymerization behavior of l-lactide catalyzed by aluminum alkyl catalysts
Ring-opening polymerization behavior of l-lactide catalyzed by aluminum alkyl catalysts
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DOI：
10.1016/j.jiec.2012.12.010
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发表时间：
2013-07
影响因子：
6.1
通讯作者：
J. Yoo;Youngjo Kim;Y. Ko
中科院分区：
文献类型：
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作者：
J. Yoo;Youngjo Kim;Y. Ko
研究了以三甲基铝（TMA）、三乙基铝（TEAL）、三辛基铝（TOA）、三异丁基铝（TIBA）和异丙醇铝（Al（O-i-Pr）3）为引发剂的L-丙交酯聚合制备聚乳酸。在聚合时间为5 min时，TIBA的转化率、转化频率（TOF）和分子量均高于Al（O-i-Pr）3。在15 min的反应条件下，烷基铝的转化率低于Al（O-i-Pr）3，但合成的聚乳酸分子量高于Al（O-i-Pr）3。TMA、TEAL和TIBA似乎具有比Al（O-i-Pr）3更低的繁殖速率和更低的终止速率。
The l-lactide polymerization using trimethylaluminum (TMA), triethylaluminum (TEAL), trioctylaluminum (TOA), triisobutylaluminum (TIBA), and aluminum isopropoxide (Al(O-i-Pr)3) were studied to produce a PLA. The conversion, turnover frequency (TOF), and molecular weight of TIBA were higher than those of Al(O-i-Pr)3with the polymerization time of 5min. In the case of 15min, the conversion of aluminum alkyls was lower than that of Al(O-i-Pr)3, but the molecular weight of PLA produced by aluminum alkyl was relatively high in comparison with the catalytic activity of Al(O-i-Pr)3. TMA, TEAL, and TIBA seemed to have lower propagation rates and much lower termination rates than Al(O-i-Pr)3.