Mechanical behavior and dilatation of particulate‐filled thermosets in the rubbery state

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Abstract
The stress–strain–dilatational response of glass‐bead‐filled, amorphous, network polyurethanes was investigated above their glass transition temperature. The mechanical–dilatational behavior was studied as functions of filler content, particle size, crosslink density of the polymer, and the surface treatment of the filler. It was found that the stress–strain properties are strongly affected by separation of the filler from the matrix. Measurements of the vacuole formation and growth processes enabled modeling the stress–strain response as well as understanding the ultimate behavior of the composites. Also, it was found that the dilatational response of the composites can be shifted on a single curve given by the second integral of the Gaussian function.

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