Influence of surface treatment and crosslinking density on the rheological and mechanical properties of particle filled

Influence of surface treatment and crosslinking density on the rheological and mechanical properties of silicone resin filled with silica particles was investigated. Although addition of particle in the liquid silicone matrix increased the storage modulus G' and the complex viscosity \eta*\ especially at a low frequency region, surface treatment of particle suppressed such tendency. On the other hand, surface treatment increased the storage modulus E' and the tensile modulus E of crosslinked elastomers. Particle unfilled silicone elastomer showed an increasing storage modulus with temperature at a rubbery region behaving as an entropy elastomer and highly particle filled elastomers showed a decreasing storage modulus indicating an enthalpy elastic character. However silicone elastomers with small particle content changed their character from entropy elastic to enthalpy elastic with increasing crosslinking density.