Injection molding of polypropylene reinforced with thermotropic liquid crystalline polymer microfibrils. Part II: Effect of impact toughening

被引：0

作者：

Baird, Donald G. ^{[1
]}

Huang, Jianhua ^{[1
]}

机构：

[1] Department of Chemical Engineering, Center for Composite Materials and Structures, Virginia Polytechnic Institute and State University, Blacksbwg, VA 24061-0211

来源：

Journal of Injection Molding Technology | 2002年 / 6卷 / 02期

关键词：

Atomic force microscopy - Elastic moduli - Liquid crystal polymers - Polypropylenes - Strength of materials - Surface roughness - Thermotropic liquid crystals;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

This paper represents a continuation of our effort to develop a robust composite system based on polypropylene (PP) reinforced with pregenerated thermotropic liquid crystalline polymer (TLCP) microfibrils. The focus of this paper is the effect on mechanical properties of replacing a conventional PP with a toughened PP (Hivalloy from Basell). It was observed that using the Hivalloy matrix in place of a conventional PP lead to a 50% increase of impact toughness (unnotched Izod test), and the values were only about 20% less than those observed for a glass reinforced Hivalloy (G7155). Furthermore, the tensile modulus, strength, and elongation-at-break of the injection molded Hivalloy/TLCP composites are statistically identical to those values for conventional PP/TLCP composites. The modulus of PP/TLCP composites could be made to exceed those of Hivalloy/glass composites by increasing the level of TLCP beyond what is possible with glass. Furthermore, the surface roughness of the PP/TLCP composites as measured by an atomic force microscope was significantly less than that of glass reinforced PP.

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页码：107 / 114