Structural and Mechanical Differences Between Neat and UV Stabilized Polyamide 6,6 Subjected to Heat Treatment

Abstract

In this study two modifications of polyamide 6,6 (neat and UV stabilized) prepared from solution cast as films and strips have been studied by X-ray diffraction (XRD) and mechanical testing (MT) subject to different temperature heating cycle. Both modifications show variation in the scattered X-ray intensity of the basal planes (100) and (010/110) as the temperature of the heating cycle is changed. Moreover, the domains (crystallites) size based on the analysis of integral breadth instead of mere FWHM has been included in the crystallite size determination, appear to narrow down as a result of the heating cycle. The tensile strength and elastic modulus improve upon heat treatment on the expense of loosing some of the stretchability in the polymer and also bringing a change in the fracture mode from ductile to brittle