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通过双螺杆熔融共混法制备PET/凹凸棒土(AT)复合材料,用示差扫描量热计(DSC)研究了PET、PET/AT复合材料的结晶行为。非等温分析结果表明:在PET中引入AT提高了PET基体结晶温度和PET结晶速率。PET及PET/AT复合材料的结晶温度随降温速率的增大而移向低温,半结晶时间及结晶度随降温速率的增大而减小。基于Avrami方程的动力学分析表明:PET/AT复合材料的非等温结晶过程是带有异相成核的三维增长过程。
The PET / attapulgite composites were prepared by twin-screw melt blending method. The crystallization behavior of PET and PET / AT composites was investigated by differential scanning calorimetry (DSC). The results of non-isothermal analysis showed that the introduction of AT into PET increased the crystallization temperature of PET matrix and PET crystallization rate. The crystallization temperature of PET and PET / AT composites shifted to lower temperature with the decrease of cooling rate, and the crystallization time and crystallization time decreased with decreasing cooling rate. The kinetic analysis based on Avrami equation shows that the non-isothermal crystallization process of PET / AT composites is a three-dimensional growth process with heterogeneous nucleation.