Radiolysis of the polyethylene/water system: Studies on the role of hydroxyl radical

The role of hydroxyl radical on polyethylene degradation under aqueous conditions has been studied. The reactivity of HO·HO· towards PE is highlighted by pulse radiolysis experiments on a PE powder suspension in water using the thiocyanate competition technique. Infrared analysis of PE films irradiated in the presence of water is performed. Solutions have been either degassed with Ar, in order to remove O2 which would react with the PE, or N2O which enhances the production of HO·HO· radicals. Oxygenated groups and double bond groups created at the surface of PE are characterized using IR analysis, and the results for both saturated solution systems are compared.