丙交酯开环均聚合

生物可降解脂肪族聚酯--聚丙交酯由可再生资源获得.聚丙交酯独特的物理性质使得它在包装、涂层、纤维、薄膜等方面有着广泛的应用.聚丙交酯低成本、大规模的生产及应用将极大地减轻对石油产品的依赖.高分子量的聚丙交酯主要由丙交酯开环聚合制备.本文总结了催化丙交酯开环聚合的3大类催化剂及其反应机理;综述了近年来国内外在丙交酯均聚合催化剂开发上的研究进展,并重点论述了稀土催化剂在丙交酯开环聚合中的优势及由其催化合成的聚丙交酯在生物学应用中的优点.

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Polylactides(PLA),biodegradable aliphatic polyesters,are derived from renewable resources.Polylactides have unique physical properties that make them useful in many applications including packaging,paper coating,fibers,and films.The production and use of PLA at low costs and in large quantities will lessen the dependence on petrochemical greatly.High molecular weight PLA can be prepared by ring-opening polymerization of lactides.Three different classes of initiators or catalysts and reaction mechanisms for the ring-opening polymerization of lactides are summarized.Recent progress in the research of novel catalysts for the lactides polymerization is reviewed.In particular,the advantages of rare earth catalysts for the ring-opening polymerization of lactides are emphasized,and biological virtue of polylactides obtained by rare earth catalysts is discussed.