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

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 alpha(sub p) sheets. No evidence of beta(sub 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 n%echanical 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.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 2004
Accession Number
ADA426285

Entities

People

  • Christopher J Ziegler
  • Frederick L Beyer

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Amplitude
  • Bulk Materials
  • Crystal Structure
  • Crystals
  • Data Sets
  • Detectors
  • Diffraction
  • Materials
  • Mechanical Properties
  • Military Research
  • Molecular Weight
  • Physical Properties
  • Scattering
  • Two Dimensional
  • Wide Angles
  • X Ray Scattering
  • X Rays

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Polymer Science and Engineering.