Wide-Angle X-ray Scattering Characterization of the Morphology of Nylon 6 6 Obturator Materials

Report No. ARL-TR-3270
Authors: Frederick L. Beyer and Christopher Ziegler
Date/Pages: August 2004; 26 pages
Abstract: Two polyamides, both nylon 6 6, were characterized by wide-angle x-ray scattering (WAXS) for variations in morphology that would account for observed differences in mechanical properties. Both materials were found to be macroscopically isotropic, consisting almost entirely of lamellae composed of α p sheets. No evidence of β p phase material was found, but both materials showed some evidence of the presence of the nonequilibrium γ (pseudo-hexagonal) phase. The blank provided, made of the first material, DuPont Zytel 101, was found to be highly uniform in morphology. The part provided, made of the second material, Zytel 42A, was found to be nonuniform, with WAXS data indicating a change in the aspect ratio of the crystalline lamellae throughout the part. This change was a likely source of differing mechanical behaviors, although differences in molecular weight and polydispersity have not been eliminated. Changes in processing were recommended as a means to improve the mechanical behavior of the samples.
Distribution: Approved for public release
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Last Update / Reviewed: August 1, 2004