A STUDY OF DYNAMIC BIREFRINGENCE IN POLYMERIC SOLIDS.
Abstract
The deformation of a polymer is accompanied by the orientation of molecules, crystals and crystalline superstructure. The case of such orientation affects the ability of the polymer to deform upon being subjected to stretch and will give rise to mechanisms of mechanical loss associated with maxima in the imaginary part of the dynamic modulus of elasticity. Tentative assignments of such loss mechanisms to molecular processes hs been previously made on the basis of dynamic mechanical studies. In the technique developed in this laboratory, birefringence (double refraction) measurements were made simultaneously with mechanical measurements. These are carried out during (a)relaxation at constant length, (b)deformation at constant strain rate, and (c)periodic strain at varying frequency. Equipment for measurements has been developed and tested. Preliminary molecular theories have been proposed. (Author, modified-PL).
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 04, 1963
- Accession Number
- AD0438545
Entities
People
- Richard S. Stein
Organizations
- University of Massachusetts Amherst