Traction characteristics of siloxanes with aryl and cyclohexyl branches

Thomas Zolper*, Zhi Li, Manfred Jungk, Andreas Stammer, Herbert Stoegbauer, Tobin Marks, Yip Wah Chung, Qian Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


The molecular structures, rheological properties, and friction coefficients of several new siloxane-based polymers were studied to explore their traction characteristics. The molecular structures including branch content were established by nuclear magnetic resonance spectroscopy, while the molecular mass distributions were determined by gel permeation chromatography. Density, viscosity, elastohydrodynamic film formation, and friction were investigated over a temperature range of 303-398 K. Film thickness and friction measurements were studied under the conditions that are representative of boundary, mixed, and full-film lubrication regimes, aiming at maximizing traction performance and temperature stability by simultaneous optimization of the size and content of ring-shaped branch structures. This study provides quantitative insight into the effect of siloxane molecular structure on the tribological performance for traction drive applications such as continuously variable transmissions.

Original languageEnglish (US)
Pages (from-to)301-311
Number of pages11
JournalTribology Letters
Issue number2
StatePublished - Feb 2013


  • Continuously variable transmissions (CVT)
  • EHL friction (traction)
  • Silicones
  • Synthetic base stocks
  • Traction fluids

ASJC Scopus subject areas

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


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