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.
Modeling Polysiloxane Volume and Viscosity Variations With Molecular Structure and Thermodynamic State
Department of Materials Science
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 25, 2013; final manuscript received August 1, 2013; published online October 7, 2013. Assoc. Editor: Xiaolan Ai.
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Zolper, T. J., Jungk, M., Marks, T. J., Chung, Y., and Wang, Q. (October 7, 2013). "Modeling Polysiloxane Volume and Viscosity Variations With Molecular Structure and Thermodynamic State." ASME. J. Tribol. January 2014; 136(1): 011801. https://doi.org/10.1115/1.4025301
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