Radiation-induced changes in the structure of an epoxy resin

Radiochemical ageing of an amine cured epoxy network. Part II: kinetic modelling

“…The hydrogen evolution observed by certain authors [5] indicates that radiolysis of CH bonds is probably the main primary event:…”

Radiochemical ageing of an amine cured epoxy network. Part I: change of physical properties

“…(c) Despite their higher stability, aromatic groups are also attacked, for instance the bisphenol A moiety in diglycidyl ether of bisphenol A (DGEBA) systems [2,4]. Discoloration [5,6] results presumably from the formation of conjugated species resulting from the attack of aromatic groups but the overall stability, as judged by the rate of carbonyl build-up or the loss of mechanical properties, is an increasing function of the aromatic content.…”

“…in all cases, the isopropanol segment: -CH 2 -CH(OH)-CH 2 -, and when aliphatic amines are used, the corresponding hydrocarbon segments, for instance dimethylene sequences in the case of ethylene diamine (EDA) [2] or triethylenetetramine (TETA) [3]. Irradiation in inert atmosphere leads to H 2 evolution, linked presumably to the fact that homolysis of CH bonds is an important primary event:…”

Iodine–paint interactions during nuclear reactor severe accidents

“…However, this reaction is not believed to be dominant pathway for three reasons: (a) the polymer radical concentration in the paint under irradiation is assumed to be low compared to other reactive sites, (b) oxygen is very reactive towards polymer radicals and would effectively compete with iodine as its concentration is much higher and (c) double bonds can be formed (Rivaton et al, 1997;Burnay, 1980;Burnay, 1982) leading to the release of a hydrogen radical.…”