Abstract
Radiolytic stability of polymeric resins is an important aspects in nuclear materials processing. The different dosage of gamma radiation was subjected to meta-polybenzimidazole (m-PBI), para-polybenzimidazole (p-PBI) and pyridine-m-PBI based polymeric resins, which was taken for the present radiolytic stability investigation. Irradiated polymers were characterized by FT-IR, SEM and TGA analysis. Extraction of U(IV) and Pd(II) as a function of nitric acid concentration using 50, 100 and 150 kGy gamma irradiated polymeric resins was carried out and static capacity was also investigated for the gamma irradiated polymeric resins and compared with their unirradiated ones. In addition, the extraction behaviour of radionuclides, namely, plutonium, americium and europium as a function of HNO3 concentration utilizing both unirradiated and 150 kGy gamma irradiated polymeric resins was studied for the first time. Results indicated that FT-IR spectra of both unirradiated and 150 kGy irradiated resins are similar. TGA analysis revealed 50% and 20% weight loss for pyridine-m-PBI, m-PBI, respectively. The distribution ratio values decreases with increase in gamma irradiation. The uranium and palladium static capacities were found to be 30 and 182 mg/g resin, respectively. The overall results indicated that p-PBI resin has higher extraction efficiency and exhibits better radiation resistant behaviour as compared to pyridine-m-PBI and m-PBI.
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