聚乙二醇增塑聚乳酸的非等温结晶动力学研究

Nonisothermal crystallization kinetics of poly(lactide) plasticized with poly(ethylene glycol)

采用DSC方法对聚乙二醇(PEG)增塑聚乳酸的非等温结晶动力学进行了研究。结果表明,PEG的加入明显提高了聚乳酸的结晶速度。对所得数据分别用Ozawa方程和莫志深方法进行了处理,发现在给定温度范围里非等温结晶时,PLA/PEG主要是以均相成核的三维生长方式结晶;PLA的结晶速度随着PEG分子质量的增加而升高。

The nonisothermal crystaUization kinetics studied by DSC at various scanning rates. The Ozawa of PLA plasticized with PEG of different molecular mass were equation and Mo Zhishen method for nonisothermal crystallization were used to analyze the data. The result displayed that,no matter how larger the molecular mass of PEG is,the Ozawa index of PLA/PEG is near 4. This suggest that the nucleation mode of PLA/PEG is homogeneous nucleation and the crystal grows in three dimension. And the Mo Zhishen index indicate the crystallization rate of PLA is increased with the molecular mass of PEG rising.