Structural Characterization and Mechanics of Chopped Fiber and Molecular Composites

摘要

The present study consists essentially of two major parts: i) processing and orientation development of Kevlar fiber composites, and ii) preparation and characterization of polyamide molecular composites. In the first part, it has been proposed to characterize the structure and orientation development of anisotropic particulates such as Kevlar chopped fibers, minerals, among others, in thermoplastic plastics. The effects of processing techniques and processing conditions on the fiber and matrix orientation have been established on the basis of the wide angle X-ray (WAXD) pole figure analysis. In the second part, various molecular composites have been prepared by mixing poly-p-phenylene terephthalamide (PPTA) and various nylons. The phenomenon of phase segregation and its kinetics has been investigated for PPTA/amorphous nylon mixtures. The melt rheology and mechanical behavior of PPTA/nylon 6 and 66 molecular and particulate composites have been evaluated. (aw)