纳米粒子/聚烯烃复合材料的结晶性能研究

报道了无机纳米粒子／聚烯烃复合材料的结晶性能研究。探索了有机成核剂苯甲酸纳、纳米二氧化钛、纳米碳酸钙对聚丙烯(PP)、高密度聚乙烯(HDPE)及其共混物的结晶形态影响，并用差示扫描量热计分析了PP，HDPE和HDPE／PP及其纳米复合材料的结晶性能。结果表明，HDPE／PP共混使HDPE的熔点(Tm)下降，PP的Tm保持不变；成核剂的加入均会使材料的Tm向低温侧移动且结晶度下降；无机纳米粒子对材料晶粒细化作用大大优于有机成核剂，纳米二氧化钛的晶粒细化作用最佳。

STUDY ON THE CRYSTAL BEHAVIOR OF NANO PARTICLE/POLYOLEFIN COMPOSITES

The crystal behavior of nano particle/polyolefin composites was investigated. The influence of nueleating agent such as sodium benzoate, nano-TiO2 , nano-CaCO3on the crystal behavior of PP, HDPE, and PP/HDPE composites was researched. Crystal behavior of PP, PP/HDPE composties and so on was evaluated by DSC. The results show that the melting point(Tm) of HDPE decreases in HDPE/PP blend system , while the Tm of PP holds the line. The adding of nucleating agent can promote Tm move to lower temperature and get lower crystal degree. Inorganic nano particles are better to diminish the size of composites crystal particle than organic nucleating agent, while nano-TiO2 can diminish the crystal size much more.