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1 International Journal of Applied Mechanics and Engineering

1 2005

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Rheology of dispersions of plasma-processed fine alumina in epoxy resin

Jakobsons E., Palcevskis E.

International Journal of Applied Mechanics and Engineering

2005

Vol. 10, no spec

225-232

The rheological properties (flow curves and the viscoelastic behavior) of the dispersions prepared from plas-ma-processed Al2O3 powders and epoxy wax were investigated on wide ranges of shear rates (from 0.018 to 1350s-1) and frequencies (from 0.063 to 157s-1). Oleic acid and Hypermer LP1 was chosen as dispersants for preparation of the dispersions. It is stated that, at the concentration f ? 15 vol. %, for the composites studied, a spatial particle-particle network structure arise, which is broken at a critical stress s0. The slippage of the sample against the surface of rheometer tools was tested by mutual collation of test records obtained with the cone-plate and cylinder-cylinder equipments. The results showed that the influence of dispersants is the most pronounced if the composite has a spatial particle-particle structure.