Second normal stress difference relaxation in a linear polymer melt following step-strain

David J. Olson, Eric F. Brown, Wesley R. Burchardt*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Flow birefringence is used to study stress relaxation following step strain deformations of a well entangled polyisoprene melt. The optical method employs multiple light paths to fully sample the three-dimensional stress tensor, and hence provides measurements of all three independent shear material functions (shear stress and both first and second normal stress differences). Experiments are complicated by multiple orders in retardation. However, data show that the ratio of the second to the first normal stress difference is a strain thinning function, with magnitude intermediate between the predictions of the Doi-Edwards model with and without independent alignment.

Original languageEnglish (US)
Pages (from-to)2671-2675
Number of pages5
JournalJournal of Polymer Science, Part B: Polymer Physics
Issue number14
StatePublished - Oct 1998


  • Doi-Edwards model
  • Melt rheology
  • Second normal stress difference

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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