Abstract: A kind of modifier was prepared via the hydrolysis of phosphorus-containing silicon coupling agent and polymethyltriethoxysilane, which was used in an epoxy/novolac curing system. Determinations of differential scanning calorimetry, thermogravimetric analysis, scanning electron microscopy, as well as limited oxygen index, impact and tensile testing were carried out to characterized the cured products. It showed that the modified epoxy resin possessed higher glass transition temperatures, impact strength, limited oxygen index, and better thermal stability.

Key words: epoxy resin, organosilicon, organophosphorus, heat resistance, toughness, flame retardancy