Measurements of flow-induced anisotropic thermal conduction in a polyisobutylene melt following step shear flow

Venkat Balasubramanian, Kendall Bush, Stoyan Smoukov, David C. Venerus, Jay D. Schieber

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18 Scopus citations

Abstract

Flow-induced anisotropic thermal conduction in a polyisobutylene melt subjected to shear deformations is studied experimentally. Time-dependent measurements of the full (four components) thermal diffusivity tensor following step shear strain flow are presented. These data were obtained with a novel experimental setup based on the optical technique of forced Rayleigh scattering. Birefringence and stress measurements are made for the same flow, and the well-known stress-thermal rule is found to be satisfied. Thermal diffusivity data and stress data are used to test directly the stress-thermal rule, which is also satisfied for the two cases considered. Consideration of stress-thermal coefficients from the present and previous studies gives preliminary evidence that flow-induced anisotropic thermal conduction is a universal phenomenon for flexible polymers.

Original languageEnglish (US)
Pages (from-to)6210-6215
Number of pages6
JournalMacromolecules
Volume38
Issue number14
DOIs
StatePublished - Jul 12 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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