纳米碳酸钙改性聚丙烯

研究了不同牌号的聚丙烯（PP）与纳米CaCO3复合材料的力学性能，考察了双螺杆挤出和密炼混合工艺及相容剂含量对PP／纳米CaCO3复合材料力学性能的影响，采用透射电子显微镜观察了纳米CaCO3在PP中的分散情况。结果表明，纳米CaCO3对不同牌号的PP均有增韧作用，对基材韧性较好的共聚PP增韧效果较显著．冲击强度提高了81％；双螺杆挤出和密炼混合均能使纳米CaCO3粒子在PP中达到较好的分散。

Modification of polypropylene with nano-CaCO3

This paper studied mechanical properties of several grades of composite materials consisting of polypropylene (PP) and nano-CaCO_3, and examined the influences of twin-screw extrusion and internal mixing process and compatibilizer content on the mechanical properties of the composite. The distribution of nano-CaCO_3 particles in the PP matrix was observed by means of transmission electron microscope (TEM). The results indicate that nano-CaCO_3 can act as a toughening agent to all grades of PP involved in the experiment, however, the toughening effectiveness is specially dependent on the character of the matrix resin. A remarkable toughening effectiveness can be acquired for the matrix resin with a better toughness, as demonstrated by an 81% increase in the impact strength. Both twin-screw extrusion and internal mixing are able to make nano-CaCO_3 particles disperse homogeneously in PP.