Evidence for the stress-thermal rule in an elastomer subjected to simple elongation

A. W. Broerman, D. C. Venerus, J. D. Schieber

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Abstract

Anisotropic thermal diffusivity is examined in a cross-linked silicone elastomer deformed in simple elongation. Thermal diffusivity both parallel and perpendicular to the stretch direction is measured using an optical technique called forced Rayleigh scattering. The thermal diffusivity is found to increase linearly with stretch ratio to a value 10% larger than the equilibrium value for a stretch ratio of two. Measurements of the birefringence and tensile stress were used to evaluate the stress-optic rule, which was found to be valid. The difference between measured thermal diffusivities parallel and perpendicular to the stretch direction and tensile stress data were used to show the thermal conductivity and stress tensors are linearly related. These data appear to be the first direct evaluation of the stress-thermal rule in a deformed polymeric material.

Original languageEnglish (US)
Pages (from-to)6965-6969
Number of pages5
JournalJournal of Chemical Physics
Volume111
Issue number15
DOIs
StatePublished - Oct 15 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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