The elastoplastic behavior of silica–silicone compounds has been characterized by a yield stress σs and an elastic modulus G0. Scaling laws have been established for the changes in rheometrical parameters with the volume fraction Φv of silica: σs∝(Φv)3.3 and G0∝(Φv)4.2 and single master curves have been obtained whatever the silica type used. The mesoscopic structure of the compounds has been studied using x-ray and light scattering and a semidilute fractal structure has been observed, with a fractal dimension D≈1.8 and a characteristic length scale 4 μm. In this paper, a formulation of the nonfluctuating semidilute fractal concept allows us to relate the fractal dimension to the rheological scaling laws: σs∝(Φv)4/(3−D) and G0∝(Φv)5/(3−D).
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