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期刊论文

Crystallizatin and impact energy of polypropylene/CaCO3 nanocomposites with ninionic modifier

于中振Qing-Xin Zhanga Zhong-zhen Yua* Xiao-Lin Xieab Yiu-Wing Maia

Polymer 45(2004)5985-5994,-0001,():

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摘要/描述

Isotactic polypropylene (PP) and calcium carbonate (CaCO3) nanocomposites were prepared by melt extrusion in a twin screw extruder. The commercial CaCO3 nanoparticles 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 CaCO3 nanoparticles. The influence of CaCO3 nanoparticles on the crystallization of PP was studied by wide angle X-ray diffraction and polarized optical microscopy. The introduction of CaCO3 particles resulted in small and imperfect PP spherulites, decreased spherulite growth rate and induced formation of b-form PP. The yield strength of PP decreased gradually while its Young’s modulus increased slightly with increasing CaCO3 loading. By adding 1.5 wt% 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.

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