DYNAMIC MECHANICAL BEHAVIOR OF EPOXY - POROUS SILICA COMPOSITES

摘要

The effect of porosity on a particle reinforcement is evaluated using dynamic mechanical analysis. Particulate reinforced polymers are pursued because of the potential improvements in modulus over the base polymer resins. Failure mechanisms in particle reinforced epoxies are correlated to the interface between the polymer and filler. In this paper we probe the effect of porosity by comparing a porous and non porous silica particulate in epoxy. SBA-15 is composed of small tube like particles of ～200-500 nm in diameter were introduced into epoxy. 6-8 nm pores were developed on the SBA-15 surface by calcining the synthesized particles. The results indicate that porosity affects polymers by enabling relaxation of the polymer chains within the pore structure of the silica. For the particle geometry and pore size investigated here, the relaxation time of the porous sample was lower than that of the non porous surface.