Modeling polysiloxane volume and viscosity variations with molecular structure and thermodynamic state

Thomas J. Zolper, Manfred Jungk, Tobin J Marks, Yip Wah Chung, Qian Wang

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Siloxane-based polymers (polysiloxanes) exhibit a range of volume, viscosity, and pressure-viscosity behaviors that are strongly influenced by the macromolecular structure. In this report, a combination of extant rheological models is applied to develop a molecular-rheological modeling formalism that predicts polysiloxane rheological properties, such as specific volume, which means density, viscosity, and pressure-viscosity index variations with macromolecular structure, pressure, and temperature. Polysiloxane molecular features are described in terms of alkyl branch length L, pendant type J, density of branch functional monomers Q, and degree of polymerization DP. Both new and published data are used for model parameter determination and validation. Several siloxane-based polymers with alkyl, aryl, alkyl-aryl, cycloalkyl, and halogenated branches were synthesized to examine the modeled relationship between their molecular structures and rheological behaviors.

Original languageEnglish
Article number011801
JournalJournal of Tribology
Volume136
Issue number1
DOIs
Publication statusPublished - 2014

Fingerprint

Siloxanes
polysiloxanes
Silicones
Molecular structure
molecular structure
Thermodynamics
Viscosity
viscosity
thermodynamics
siloxanes
Density (specific gravity)
Polymers
polymers
polymerization
monomers
Monomers
Polymerization
formalism
Temperature
temperature

Keywords

  • Elastohydrodynamic lubrication
  • Lubricants
  • Rheology
  • Viscosity

ASJC Scopus subject areas

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

Cite this

Modeling polysiloxane volume and viscosity variations with molecular structure and thermodynamic state. / Zolper, Thomas J.; Jungk, Manfred; Marks, Tobin J; Chung, Yip Wah; Wang, Qian.

In: Journal of Tribology, Vol. 136, No. 1, 011801, 2014.

Research output: Contribution to journalArticle

Zolper, Thomas J. ; Jungk, Manfred ; Marks, Tobin J ; Chung, Yip Wah ; Wang, Qian. / Modeling polysiloxane volume and viscosity variations with molecular structure and thermodynamic state. In: Journal of Tribology. 2014 ; Vol. 136, No. 1.
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