纳米级CaCO_3粒子增韧增强聚丙烯的研究  

Study on Reinforced Polypropylene Toughened by Nano-CaCO_3 Particles

作　　者：任显诚[1] 白兰英[1] 王贵恒[1] 张伯兰[2] 

机构地区：[1]四川大学高分子材料系,成都610065 [2]中国科学院成都分院有机化学研究所,成都610041

出　　处：《中国塑料》2000年第1期22-26,共5页China Plastics

基　　金：中国科学院高分子物理联合开放研究实验室资助!(长春应用化学研究所 )

摘　　要：通过对纳米级CaCO3粒子进行表面预处理和熔融共混工艺制备了PP/纳米Ca CO3复合材料 ,并进行了力学测试和结构表征。结果表明 ,经过适当表面处理的纳米CaCO3粒子可以通过熔融共混法均匀分散在聚丙烯中 ,粒子与基体界面结合良好 ,纳米CaCO3粒子在低于 10 %用量时即可使聚丙烯缺口冲击强度提高 3～ 4倍 ,同时基本保持其拉伸强度和刚度。DSC熔融曲线分析表明 ,CaCO3对聚丙烯的 β晶结晶过程有明显的诱导作用 ,提高了β晶的含量 ,增加了PP基材的韧性 ,通过对填充复合材料的冲击断面观察证明 ,材料的增韧是由于基体发生了大面积屈服所致。PP/CaCO 3 nano-composites have been prepared by surface pre-treatment of nano-CaCO 3 and melt-blending, and the mechanical testing and structure characterization are conducted. The result shows that nano-CaCO 3 particles treated in proper way can be uniformly dispersed in PP and bonding with matrix better. The impact strength of PP composite increases about 3～4 times even though dosage of CaCO 3 nano particles is less than 10 percent while tensile strength and stiffness of PP are remained basically. DSC analysis shows that CaCO 3 has obvious induction effect to the β-spherulites crystallization of PP, increases the contents of β-spherurulites and improves the toughness of PP. It is proved that the materials toughening results from large areas stress yield in matrix by observing impact cross section of the filled composites.\;

关 键 词：聚丙烯 纳米复合材料 增韧 碳酸钙 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]