Accession Number : AD0277402

Title :   THE DYNAMIC BIREFRINGENCE OF HIGH POLYMERS II

Corporate Author : MASSACHUSETTS UNIV AMHERST POLYMER RESEARCH INST

Personal Author(s) : STEIN,RICHARD S. ; ONOGI,S.

Report Date : 30 APR 1962

Pagination or Media Count : 1

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)

Descriptors :   *ETHYLENES, *POLYMERS, *REFRACTION, CRYSTALS, DEFORMATION, FILMS, LIGHT, OPTICS, PLASTICS, RELAXATION TIME, SCATTERING, STRESSES, THEORY

Distribution Statement : APPROVED FOR PUBLIC RELEASE