滑石粉、碳酸钙填充聚丙烯复合材料非等温结晶行为的对比研究

运用熔融共混法分别制备了聚丙烯/滑石粉、聚丙烯/碳酸钙复合材料，借助于示差扫描量热法和热台偏光显微镜研究了复合材料的非等温结晶形态及其结晶行为。结果表明：滑石粉、碳酸钙对聚丙烯结晶形态和结晶性能的影响有很大不同。滑石粉有明显的异相成核作用，使聚丙烯球晶的数量增加、尺寸变小；而碳酸钙几乎未表现出成核作用，加入后反而使聚丙烯得到大而完善的球晶，黑十字消光现象明显。滑石粉会使聚丙烯的结晶温度和熔融温度升高，结晶度增大；而碳酸钙则使聚丙烯的结晶温度明显降低，熔融温度及结晶度几乎不受影响。

Study on Crystalline Properties of PP Composite Filled by Talc or Calcium carbonate

PP/Talc and PP/CaCO3 composites were prepared by melt mixing. Their crystal morphology and crystalline properties were studied using differential scanning calorimetry and hot stage polarized light microscopy. Results show that the influences of Talc and Calcium carbonate on the crystal morphology and crystalline properties of the PP matrix are different obviously. Talcum powder has clear heterogeneous nucleation effect, which could enable the number of polypropylene spherulite increased and the size reduced. In contrast, there is no significant nucleation of calcium carbonate is observed. For PP/Talc composite, both the Crystallization temperature and melting temperature raised; In PP/CaCO3 composite, the large and perfect spherulite formed, the black cross optical phenomena is observed clearly. Its crystal temperature reduced while its melting temperature is almost not affected.