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The effect of particle concentration on the rheology of polydimethylsiloxane filled with fumed silica

✍ Scribed by L. E. Kosinski; J. M. Caruthers

Publisher
John Wiley and Sons
Year
1986
Tongue
English
Weight
703 KB
Volume
32
Category
Article
ISSN
0021-8995

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✦ Synopsis

The effects of particle concentration on the shear-ratedependent viscosity, stress relaxation, and stress growth function were investigated for various molecular weight polydimethylsiloxane (PDMS) fluids filled with colloidal fumed silica. Shear-ratedependent stress relaxation was observed for all dispersions, and a significant stress growth overshoot was observed when the PDMS molecular weight was just greater than the entanglement molecular weight. The rate of stress-relaxation and the type of stress growth are primarily determined by the previous shear rate history and the PDMS molecular weight, while particle concentration only affects the quantitative details of the filled fluid's rheology. The observed effects of particle concentration are consistent with a molecular deformation process, where the silica particles interact via the entanglements of the polymer adsorbed on the surface of the fumed silica.

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