PBS/PHAs的熔融行为和非等温结晶动力学

用示差扫描量热仪测定了聚羟基丁酸酯(PHAs)/聚丁二酸丁二醇酯(PBS)共混体系的熔融和非等温结晶动力学。结果发现:PHAs和PBS之间存在着相互作用。用Jeziorny方程对共混体系的非等温结晶动力学进行了研究,说明PHAs的加入对PBS的结晶动力学参数影响不大,PHAs的加入没有起到异相成核的作用,而是使PBS的结晶生长更加完善。用Kissinger方程计算了体系的结晶活化能,发现PHAs的加入使结晶活化能先升高后降低。

Melting Behavior and Non-isothermal Cristallization Kinetics of PHAs/PBS Blends

The melting and crystallization behaviors and non-isothermal crystallization kinetics of polyhydroxyalkanoates(PHAs) and biodegradable linear aliphatic polyester poly(butylene succinate)(PBS)blends were studied by differential scanning calorimeter(DSC).It was showed that there was an interaction existence between PHAs and PBS.The non-isothermal cristallization kinetics of blends could be well described with the Jeziorny equation.The mechanism of PBS was almost not affected by the inclusion of PHAs.Values of Jeziorny exponent indicated the crystallization nucleation was homophase the growth of spherulites was nearly three-dimensional.The crystallization activation energy was estimated by Kissinger equation,it decreased in a little by addition of PHAs,then creased.