Abstract
The interaction of polyacrylic acid (PAA), polysodium acrylate (PAANa), polyacrylamide (PAM) and acrylic acid-acrylamide copolymer P(AM-AA) with copper sulphate was studied to evaluate the thermal and radiation chemical stabilities of the resultant polymers which contained increasing quantities of Cu 2+ . It was found that the efficiency of the polymers toward Cu 2+ interaction, as determined by XRF, follows the order P(AM-AA) > PAM > PAANa. PAA was inactive, and no Cu 2 + ions were detected. Generally, the results obtained from TGA and DSC reveal that there is an improvement in the thermal stability when Cu 2+ is incorporated into the polymer matrix, but the amount of Cu 2 + bound to the polymeric chains does not correlate with their relative thermal stability. The degree of crystallinity estimated by X-ray diffraction also increases as Cu 2 + is incorporated into the polymer. In addition to the thermal stability, the radiation chemical stability of polymer with accumulated Cu 2+ was found to be very high, so that the percentage of Cu 2+ released from the crosslinked polymers was zero at radiation doses of up to 500kGy.
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