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首页> 外文期刊>RSC Advances >Synthesis, characterization, and catalytic activity of sodium ketminiate complexes toward the ring-opening polymerization of l-lactide
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Synthesis, characterization, and catalytic activity of sodium ketminiate complexes toward the ring-opening polymerization of l-lactide

机译：酮酮络合物朝向L-丙交酯的开环聚合的合成，表征和催化活性

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Studies of the ring-opening polymerization of L -lactide (LA) using Na complexes with Schiff base ligands as catalysts have revealed high catalytic activity but poor controllability of the polymer molecular weight. In this study, Na complexes bearing ketiminate ligands instead of Schiff base ligands were synthesized and their application in LA polymerization was tested. The polymerization results revealed that the catalytic activity of Na complexes bearing ketiminate ligands was higher than that of Na complexes bearing Schiff base ligands, but the poor controllability of polymer molecular weight was still a drawback. However, the poor controllability could be improved by means of using a high concentration of initiators in the polymerization system at 0 °C for 1 min. L ~(Py) –Na revealed the excellent controllability of polymer molecular weight depending on the ratio of [LA]/[initiator] (the molar averages of the number from 4500 to 35?000) with narrow polydispersity indexes, ranging from 1.29 to 1.35.
机译：使用席克夫碱配体作为催化剂的Na络合物的L-LACTEDE（LA）的开环聚合的研究显示了高催化活性，但聚合物分子量的可控制性差。在该研究中，合成了轴承酮酸盐配体而不是席克碱配体的Na络合物，并测试其在La聚合中的应用。聚合结果表明，轴复合物的催化活性轴承酮亚酸盐配体高于亚络合物的亚络合物轴复合物，但聚合物分子量的可稳定性仍然是缺点。然而，通过在0℃下在0℃下使用聚合体系中的高浓度引发剂可以改善可差的可控性。 L〜（py）-NA揭示了聚合物分子量的优异可控性，这取决于[LA] / [引发剂]的比例（从4500至35 000 000 000 000小时的摩尔平均值），从1.29范围内的范围1.35。

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