is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. a b s t r a c tThe thermo-oxidative behavior of unformulated (unfilled) samples of epoxy coatings has been studied at five temperatures ranging from 70• C to 150• C. Two epoxy networks based on diglycidyl ether of bisphenol A (DGEBA), respectively, cured by jeffamine (POPA) or polyamidoamine (PAA) were compared. Infrared spectrophotometry (IR), differential scanning (DSC) and sol-gel analysis (SGA) were used to monitor structural changes.Thermal oxidation leads to carbonyl and amide formation in both systems. POPA systems appear more sensitive to oxidation than PAA ones. Thermal oxidation leads to predominant chain scission as evidenced by the decrease of glass transition temperatures (T g ) and increase of sol fraction.

c The effects of irradiation at three distinct dose rates have been studied on two epoxy networks. c DGEBA-polyamidoamine networks appear more stable than DGEBA-polyoxypropylene diamine ones. c A simple kinetic model involving methyl ketones is proposed.