Studies of the effects of molecular weight on the gamma irradiation degradation of poly [Methylmetacrylate] doped with p-N, N-dioxaloylaminobenze -N',N'-dioxaloylsulphonyloxamide and its cobalt [II] complex

Protection of some poly [methylmethacrylate] samples against gamma rays had been investigated in the absence and presence of p N,N-dioxaloylamjnobenzene-N', N' dioxaloylbenzenesul-phony-loxamide and its cobalt [II] complex. The pure PMMA [without additives], PMMA-ligand and PMMA-cobalt [II] complex composite samples were irradiated with gamma rays for different exposure doses [5, 15, 25, 35, 50, 75 and 100 kGy]. Viscosity average molecular weight [Mv-values] and thin layer chromatographic measurements were carded out after each irradiation dose. The maximum protection against gamma ray was found when 1% of the organic ligand or its cobalt [II] complex is used in the polymer matrix