Influence of gamma irradiation on the chemical and physical properties of DGEDDS / PDA and DGEDDS / MDA epoxy resins

In this work we studied the effects of exposure to gamma radiation on two type epoxy resins: diglycidylether of bisphenol A (DGEBA) and diglycidyether 4,4 ʹ- dihydroxydiphenyl sulfone (DGEDDS) crosslinked with methylenedianiline (MDA) and 1,2-phenylenediamine (PDA). These resins were synthesized by condensing mass of the diol with epichlorohydrin in a basic medium. IRTF spectrometry and :H NMR was used to identify their structures before crosslinking. Then we followed the aging ATG by X microanalysis also allowed us to highlight the phenomenon of oxidation of the surface observed by SEM photos. Knowledge of the glass transition temperature and the starting temperature of degradation indicates a correlation between thermal stability and structure. The improvement of thermal properties could be a key issue to ensure structural stability of a matrix and therefore a better resistance to radiation.