COMPARISON OF THE RHEOLOGICAL PROPERTIES OF LINEAR AND STAR-BRANCHED POLYISOPRENES IN SHEAR AND ELONGATIONAL FLOWS.

Dale S. Pearson*, Susan J. Mueller, Lewis J. Fetters, Nikolaos Hadjichristidis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

In the reported experiments, the rheological properties of narrow-molecular-weight-distribution linear and star-branched polyisoprenes have been determined using both shearing and stretching deformations. At all strain rates studied the tensile stress measured under transient and steady-state conditions did not increase above the linear viscoelastic value. The absence of an enhanced tensile stress for the branched polymer is in contrast to what is observed for branched low-density polyethylene. An explanation for the difference is proposed. Additional remarks are made about the broad distribution of relaxation times observed for star-branched polyisoprenes and about the approach to steady state in constant-strain-rate and constant-stress tests.

Original languageEnglish (US)
Pages (from-to)2287-2298
Number of pages12
JournalJournal of polymer science. Part A-2, Polymer physics
Volume21
Issue number11
StatePublished - Jan 1 1983

ASJC Scopus subject areas

  • Engineering(all)

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