Measurement of anisotropic transport in flowing polymers by using a holographic technique

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

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Almost no experimental data exist to test theories for the nonisothermal flow of complex fluids. To provide quantitative tests for newly proposed theories, we have developed a holographic grating technique to study energy transport in an amorphous polymer melt subject to flow. Polyisobutylene with weight-averaged molecular mass of 85 kDa is sheared at a rate of 10 s -1, and all nonzero components of the thermal conductivity tensor are measured as a function of time, after cessation. Our results are consistent with proposed generalizations to the energy balance for microstructural fluids, including a generalized Fourier's law for anisotropic media. The data are also consistent with a proposed stress-thermal rule for amorphous polymer melts. Confirmation of the universality of these results would allow numerical modelers to make quantitative predictions for the nonisothermal flow of polymer melts.

Original languageEnglish (US)
Pages (from-to)13142-13146
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number36
StatePublished - Sep 7 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General


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