Wide-Angle X-Ray Scattering Characterization of the Morphology of Nylon 6 6 Obturator Materials
Final rept. Dec 2003-Feb 2004
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
Pagination or Media Count:
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 alphasub p sheets. No evidence of betasub p phase material was found. but both materials showed some evidence of the presence of the nonequilibnum gamma 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 diffenng nechanical 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.
- Laminates and Composite Materials