Anisotropic thermal conductivity in cross-linked polybutadienes subjected to uniaxial elongation

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Abstract

Anisotropic thermal transport in cross-linked polybutadienes deformed in simple elongation is investigated experimentally. Using a novel optical technique based on forced Rayleigh scattering, two components of the thermal diffusivity tensor are measured as a function of stretch ratio. The thermal diffusivity is found to increase in the direction parallel, and decrease in the direction perpendicular, to the stretch direction, with a maximum anisotropy of ∼25% relative to the equilibrium value. Measurements of the tensile stress as a function of stretch ratio were also made. These data were used to show that the thermal conductivity and stress tensors are linearly related or that the stress thermal rule is valid. The value of the stress thermal coef?cient for the cross-linked polybutadiene systems was found to be consistent with previously reported values for both a cross-linked silicone rubber and polyisobutylene melts.

Original languageEnglish (US)
Pages (from-to)2594-2598
Number of pages5
JournalMacromolecules
Volume42
Issue number7
DOIs
StatePublished - Apr 14 2009
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Materials Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Organic Chemistry

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