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: diglycidyléther of bisphenol a (dgeba) and diglycidyether 4,4 '-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 1h 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.