Elongational dynamics of multiarm polystyrene

Henrik K. Rasmussen, Anne Ladegaard Skov, Jens Kromann Nielsen, Phillippe Laille

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Abstract

The startup of uni-axial elongational flow followed by stress relaxation and reversed bi-axial flow has been measured for a branched polystyrene melt with narrow molar mass distribution using the filament stretching rheometer. The branched polystyrene melt was a multiarm A(q)-C-C-A(q) pom-pom polystyrene with an estimated average number of arms of q=2.5. The molar mass of each arm is about 28 kg/mole with an overall molar mass of M-w=280 kg/mole. An integral molecular stress function constitutive formulation within the "interchain pressure" concept agrees reasonably well with the experiments.
Original languageEnglish
JournalJournal of Rheology
Volume53
Issue number2
Pages (from-to)401-415
ISSN0148-6055
DOIs
Publication statusPublished - 2009

Bibliographical note

Copyright (2009) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

Keywords

  • polymer melts
  • non-Newtonian flow
  • rheology
  • plastic flow
  • elongation

Cite this

Rasmussen, H. K., Skov, A. L., Nielsen, J. K., & Laille, P. (2009). Elongational dynamics of multiarm polystyrene. Journal of Rheology, 53(2), 401-415. https://doi.org/10.1122/1.3059575