Abstract
Silica-polyacrilicacid (PAA)-epoxy IPN and Silica-epoxy IPN were prepared using the phase separation during the sol-gel transition of alkoxysilane-PAA system. The silica-PAA IPN or silica skeleton prepared by heat treating the silica-PAA IPN at 600℃ or 800℃were soaked with epoxy resin to prepare silica-PAA-epoxy IPN or silica-epoxy IPN. Thermodynamic properties of these IPNs have been investigated. The storage modulus (E') of these IPNs prepared with two different types of epoxy resin remained high even at the temperature range over the glass transition.In addition, silica-PAA-epoxy IPN showed high loss modulus (E") at about 300℃. The high E" value suggests that the silica network protects the polymer at high temperature. The thermogrvimetric measurements have confirmed the protection effect of silica network againstthe thermal decomposition.
