THE DYNAMIC BIREFRINGENCE OF HIGH POLYMERS II

Abstract

The time-dependence of birefringence was investigated in experiments involving relaxation at constant strain, extension at constant rate of strain, and periodically varying strain. The results of constant strain relaxation are calculated using the linear phenomenological theory of birefringence relaxation. Strain-optical coefficient spectra are calculated for a number of low and high density polyethylenes and characteristics of the spectra are correlated with sample density. A simple molecular theory is presented. The time-dependence of birefringence is believed to arise principally from the finite relaxation time for crystal orientation. (Author)

Document Details

Document Type
Technical Report
Publication Date
Apr 30, 1962
Accession Number
AD0277402

Entities

People

  • Richard S. Stein
  • S. Onogi

Organizations

  • University of Massachusetts Amherst

Tags

DTIC Thesaurus Topics

  • Birefringence
  • Coefficients
  • Dielectric Polymers
  • High Density
  • Orientation (Direction)
  • Physical Properties
  • Polymers
  • Relaxation Time
  • Spectra
  • Time
  • Time Dependence

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Theoretical Analysis.