Crystallization And Impact Energy Of Polypropylene/Caco3 Nanocomposites With Nonionic Modifier
Crystallization And Impact Energy Of Polypropylene/Caco3 Nanocomposites With Nonionic Modifier
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DOI：
10.1016/j.polymer.2004.06.044
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发表时间：
2004-08
期刊：
影响因子：
4.6
通讯作者：
Qingxin Zhang;Z. Yu;Xiaolin Xie;Y. Mai
中科院分区：
文献类型：
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作者：
Qingxin Zhang;Z. Yu;Xiaolin Xie;Y. Mai
在双螺杆挤出机中采用熔融挤出法制备了等规聚丙烯（PP）/碳酸钙（CaCO 3）纳米复合材料。商业CaCO 3纳米粒子在PP基体中的分散性较差。在熔融挤出过程中加入少量的非离子改性剂，大大改善了碳酸钙纳米粒子的分散性。采用广角X射线衍射和偏光显微镜研究了纳米碳酸钙对聚丙烯结晶行为的影响。CaCO 3粒子的引入导致PP球晶尺寸变小、不完整，球晶生长速率降低，并诱导β晶型PP的形成。随着CaCO 3用量的增加，PP的屈服强度逐渐降低，而杨氏模量略有增加。在PP/CaCO_3（85/15）纳米复合材料中加入1.5wt%的非离子改性剂，复合材料的拉伸性能变化不大，但缺口冲击功显著提高。
Isotactic polypropylene (PP) and calcium carbonate (CaCO3) nanocomposites were prepared by melt extrusion in a twin screw extruder. The commercial CaCO3nanoparticles had a poor dispersion in PP matrix. The addition of a small amount of a nonionic modifier during melt extrusion greatly improved the dispersion of CaCO3nanoparticles. The influence of CaCO3nanoparticles on the crystallization of PP was studied by wide angle X-ray diffraction and polarized optical microscopy. The introduction of CaCO3particles resulted in small and imperfect PP spherulites, decreased spherulite growth rate and induced formation of β-form PP. The yield strength of PP decreased gradually while its Young's modulus increased slightly with increasing CaCO3loading. By adding 1.5wt% of nonionic modifier to PP/CaCO3(85/15) nanocomposite these tensile properties were not changed much but the notched Izod impact energy of the composites was significantly increased.