可生物降解PLA/PCL、PELA/PECL高分子共混体系的早期降解行为——相结构与降解性能的关系

本文以吸水率,GPC、SEM等考察了聚d,1—乳酸(PLA)/聚ε—己内酯(PCL)、聚d,1—乳酸—聚乙二醇(PEG)/聚ε—己内酯—聚乙二醇(PEG)可生物降解共混多相体系的体外降解行为,研究了PH值、共混组成及相容性对降解性能的影响,并就共混物形态结构与降解性能的关系作了讨论。PLA/PCL共混体系,随PLA含量增大,吸水性增强,降解速率加快。PLA/PCL(75/25)共混物表现出较PLA更高的吸水宰,经65天降解,分子量显著下降。由于聚乙二醇链段的亲水性和内增容作用,PELA/PECL(50/50)共混物的吸水率较PLA/PCL(50/50)共混物大为提高。

MISCIBILITY AND CRYSTALLIZATION BEHAVIOR OF BIODEGRADABLE BLEND OF POLY(β—HYDROXYBUTYRATE)AND POLY(D,L—LACTIDE)—CO—POLY(ETHYLENE GLYCOL)

Studies on the miscibility of PHB/PELA blends showed that PHB and PELA were miscible in amorphous state.The crystallization behavior of PHB in the blend was strongly de- pendent on the addition of PELA component.