ORIENTATION STUDIES ON DRAWN POLYOLEFINS

Abstract

X-ray diffraction and birefringence data obtained indicate that quenched samples possess more orientation at a given elongation for both polyethylene and polypropylene films. Thus, the finer the texture and the lower the degree of crystallinity, the less the stress required to orient the polymer a given amount. Polyethylene film follows a 3 orientation process on cold drawing with the a-axis orienting perpendicular to the stretching direction twice as rapidly as the b-axis, as the c-axis is turned toward the stretching direction. Polypropylene film, on the other hand, shows random orientation of the a' and b-axis about the c-axis as the c-axis is turned toward the stretching direction. This may be related to differing ease of crystal distortion between the two polymer systems. (Author)

Document Details

Document Type
Technical Report
Publication Date
May 22, 1961
Accession Number
AD0257562

Entities

People

  • D.g. Legrand
  • J. Powers

Organizations

  • University of Massachusetts Amherst

Tags

DTIC Thesaurus Topics

  • Birefringence
  • Cold Drawing
  • Dielectric Polymers
  • Diffraction
  • Distortion
  • Elongation
  • Materials
  • Materials Processing
  • Orientation (Direction)
  • Polymers
  • Polypropylene
  • X Rays
  • X-Ray Diffraction

Readers

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