Correlation of polysiloxane molecular structure to shear-thinning power-law exponent using elastohydrodynamic film thickness measurements

Thomas J. Zolper*, Paul Shiller, Manfred Jungk, Tobin J. Marks, Yip Wah Chung, Aaron Greco, Gary Doll, Babak Lotfizadeh Dehkordi, Qian Wang

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Siloxane-based polymers (polysiloxanes) are susceptible to temporary shear-thinning that manifests as a reduction of elastohydrodynamic film thickness with increasing entrainment speed or effective shear rate. The departure from Newtonian film thickness can be predicted with the power-law exponent ns, an indicator of the severity of shear-thinning in a polymeric fluid that is influenced by the macromolecular structure. In this paper, a combination of extant rheological and tribological models is applied to determine the power-law exponent of several polysiloxanes using film thickness measurements. Film thickness data at several temperatures and slide-to-roll ratios are used to validate the methodology for several siloxane-based polymers with alkyl and aryl branches.

Original languageEnglish (US)
Article number031503
JournalJournal of Tribology
Volume137
Issue number3
DOIs
StatePublished - Jul 1 2015

Keywords

  • Elastohydrodynamic lubrication
  • Fluid film lubrication
  • Rheology
  • Viscosity

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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