滑石
结晶
差示扫描量热法
材料科学
成核
PEG比率
乙二醇
化学工程
动力学
阿夫拉米方程
活化能
高分子化学
热力学
聚合物结晶
复合材料
物理化学
化学
物理
工程类
经济
量子力学
财务
作者
Ming Li,Defu Hu,Yaming Wang,Changyu Shen
摘要
Abstract The nonisothermal crystallization behavior of poly(lactic acid) (PLA) in the presence of talc with poly(ethylene glycol) (PEG) was performed by using differential scanning calorimetry (DSC) and polarized optical microscopy. It was evidenced that talc together with PEG had a synergistic effect on enhancing the crystallization rate of PLA, despite the fact that the two additives had an opposite effect on the size and density of the spherulites. The nonisothermal crystallization data were analyzed by using three different kinetics models, namely, the Avrami, Ozawa, and Mo models. It was found that the Avrami method and the Mo model could describe the experimental data of the nonisothermal crystallization fairly well for all the specimens, whereas the Ozawa analysis failed to provide an adequate description of the nonisothermal crystallization of the PLA formulations comprising talc with PEG. The difference in the values of the Avrami exponent between neat PLA and its mixtures with talc and PEG suggested that the nonisothermal crystallization of the mixtures corresponds to a three‐dimensional growth with heterogeneous nucleation. The activation energy for nonisothermal crystallization of PLA formulations was evaluated based on the differential isoconversional method of Friedman. POLYM. ENG. SCI., 2010. © 2010 Society of Plastics Engineers
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