engleski

Thermal degradation kinetics of epoxy-silica organic-inorganic hybrid materials

Degradation kinetics of organic-inorganic hybrids based on epoxy resin was investigated by thermogravimetric analysis (TGA). The hybrid materials were prepared from diglycidyl ether of bisphenol A (DGEBA) as organic precursor, and 3-glycidyloxypropyltrimethoxysilane (GLYMO) as inorganic precursor, polymerised simultaneously by poly(oxypropylene)diamine (Jeffamine D230). Energy of activation (Ea) of degradation processes for the hybrids with varying inorganic content, as well as for the unmodified epoxy-amine system, was determined by isoconversional methods. The complete process of degradation was described by appropriate kinetic models. It was found that the hybrid materials have significantly higher Ea of degradation than the unmodified epoxy-amine resin, and that the inorganic network influences the mechanism of degradation of organic phase.

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