Breakdown of the cox-merz rule and instability of polymer solutions in viscometric flows

Changping Sui, Gregory B. McKenna

Research output: Contribution to conferencePaperpeer-review

3 Scopus citations

Abstract

There has been considerable interest in recent years concerning the instability of polymer melts and solutions in viscometric flows. Here we examine the flow instability in a polybutadiene solution and in NIST SRM 2490. The instability manifests itself as a deviation from the Cox-Merz rule that relates steady shear viscosity vs. shear rate with dynamic viscosity vs. frequency. We find that in all instances of deviation from the Cox-Merz rule investigated the fluid undergoes edge fracture and the deviations can be related to the edge fracture rather than to changes in constitutive behavior.

Original languageEnglish
Pages2351-2355
Number of pages5
StatePublished - 2006
EventSociety of Plastics Engineers Annual Technical Conference 2006, ANTEC 2006 - Charlotte, NC, United States
Duration: May 7 2006May 11 2006

Conference

ConferenceSociety of Plastics Engineers Annual Technical Conference 2006, ANTEC 2006
CountryUnited States
CityCharlotte, NC
Period05/7/0605/11/06

Keywords

  • Cox-Merz rule
  • Edge fracture
  • Instability
  • Mass loss
  • Steady shearing flows

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