Accession Number:

ADA237332

Title:

Deconvolution of X-Ray Diffraction Data to Elucidate Plastic Deformation Mechanisms in the Uniaxial Extension of Bulk Nylon-6

Descriptive Note:

Interim technical rept. no. 27, 1990-1991,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s):

Report Date:

1991-05-31

Pagination or Media Count:

26.0

Abstract:

At least square peak deconvolution procedure was applied to wide angle x-ray diffraction data on uniaxially drawn nylon 6 so that pole figures could be generated from clearly separated crystallographic reflections. Beside peak total intensity pole figures a new type of pole figure, based on peak widths, was proposed and proved to be useful in elucidating the mechanisms of plastic deformation in the nylon 6 samples. In uniaxial tension alpha and gamma crystals of nylon 6 become oriented with macromolecular chains parallel to the drawing direction. In contrast to gamma crystals, alpha crystals experience a large amount of breakdown between planes containing hydrogen bonds. Macromolecules which are in the amorphous phase are mostly aligned along the drawing direction and that fraction of amorphous phase are mostly aligned along the drawing direction and that fraction of amorphous phase which is so oriented shows the best close packing.

Subject Categories:

  • Plastics
  • Atomic and Molecular Physics and Spectroscopy
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE