概述了国内外近年来采用环氧类、异氰酸酯类扩链剂增容聚对苯二甲酸-己二酸-丁二醇酯/聚乳酸(PBAT/PLA)共混体系的增容机理。环氧基团可与PBAT、PLA的端—OH和—COOH发生反应,形成PBAT-g-PLA共聚物,反应过程包含酯化、大分子链断裂、扩链、支化、环氧基团开环、羟基形成等一系列复杂反应。带有两个以上环氧基团的增容剂添加量过多时,增容剂成为交联点,发生交联反应。异氰酸酯类增容剂分子上异氰酸酯基团可与PBAT、PLA的端羟基反应生成氨基甲酸酯键,与端羧基反应形成酰胺键。异氰酸酯类增容剂通过化学键将PBAT和PLA连接起来,显著地提高相容性。还对环氧类、异氰酸酯类扩链剂增容PBAT/PLA共混体系做出总结和展望。
The compatibilization mechanism of PBAT/PLA blended with epoxy and isocyanate chain extenders in recent years was reviewed.The epoxy groups of compatibilizer can react with the hydroxyl groups and carboxyl groups of PBAT and PLA to form PBAT-g-PLA copolyester.The reaction process contains a series of complex reactions such as esterification,breakage of macromolecular chain,chain extension,branching,ring opening of epoxy group,formation of hydroxyl group,etc.When the amount of compatibilizer with more than two epoxy groups is added too much,the compatibilizer becomes the cross-linking point and the cross-linking reaction takes place.The isocyanate compatibilizer can react with the hydroxyl group of PBAT and PLA to form carbamate,and with the carboxyl group to form amide.The isocyanate compatibilizer joins PBAT and PLA through chemical bond,which improves the compatibility of PBAT/PLA blend remarkably.In addition,the compatibilization of PBAT/PLA blended with epoxy and isocyanate chain extenders was summarized and prospected.
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基金资助
平顶山市重大科技攻关项目(2020ZD05);河南省高等学校重点科研项目(22B430008);河南城建学院2022年省级大学生创新创业训练计划项目(202211765014)
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