Abstract
Effects of particle shape and size on Young's modulus of cured epoxy resins have been measured. These resins were filled with irregularly shaped or spherical silica particles. These particles were sorted into six groups having different mean sizes ranging from 2 to 50μ m. In the resins filled with irregularly shaped particles, the flexural and compressive moduli slightly increased with an increase in particle size, whereas in the resins filled with spherical particles, they were not changed with particle size. In both systems, tensile modulus slightly decreased with the increase in particle size. The modulus values for the resins filled with irregularly shaped particles were higher than those for the resins filled with spherical particles in flexural, compressive and tensile moduli. The measured values were always higher in the order of compressive modulus >flexural modulus > tensile modulus.
