Abstract
The effect of two-silica-particle compositions on the thermo-viscoelastic properties of epoxy composites was studied according to Lewis and Nielsen's mixture law and particle packing model. The composite specimens varied with different compositions of two-silica-particle (240nm and 1.56μm) were prepared at the constant volume fraction, 0.30. The thermo-viscoelastic properties for neat epoxy and the composites were measured in the temperature ranges from 123K to 523K and compared to theoretical results according to Lewis and Nielsen's law with the maximum packing fraction of particles, φ_<max> of Ouchiyama and Tanaka's model. Consequently, thermo-viscoelastic properties of two silica particulates filled epoxy composites were definitely dependent on maximum packing fraction of particles below glass transition temperature T_g, and on mobility of matrix resin above T_g.
