BisGMA/TiO2 organic-inorganic hybrid nanocomposite

BisGMA (Bisphenol-A-glycidyidimethacrylate) resin had been modified by incorporating TiO2 nanoparticles (0.5-2% by weight). An ultrasonic mixing process was used to disperse the particles into the resin system prior to casting and curing test specimens. TEM investigation showed that the particles were nano size (5-60 nm) and dispersed throughout the entire volume of the resin. In dynamic mechanical analysis, nanophase resin showed increase in storage modulus and glass transition temperature from neat resin system. Thermogravimetric analysis revealed better thermal stability. Flexural loading, T-g and flexural modulus of the nanocomposites were enhanced as the particle volume fraction was enhanced and than decreased.