Time-Dependence of Crystal Orientation in Crystalline Polymers

Abstract

The results of two methods for studying molecular processes accompanying the deformation of polyethylene are described. The examination of spherulite deformation by observing light scattering patterns along with measurement of the birefringence, stress and strain during the rapid extension of polyethylene shows that this initial structural deformation is essentially instantaneous. Dynamic x-ray diffraction shows that this is followed by a slower relaxation involving change in the orientation of the crystals by two processes, the lower temperature one involving slipping of lamellae past each other and the higher temperature one involving viscoelastic flow of the crystals.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1967
Accession Number
AD0666622

Entities

People

  • Richards S. Stein

Organizations

  • University of Massachusetts Amherst

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Birefringence
  • Crystals
  • Dielectric Polymers
  • Diffraction
  • Light Scattering
  • Massachusetts
  • Measurement
  • Mechanical Properties
  • Military Research
  • Molecules
  • Photographs
  • Polymers
  • Scattering
  • Time Dependence
  • United States
  • X Rays
  • X-Ray Diffraction

Readers

  • Computational Modeling and Simulation
  • Materials Science and Engineering.