The aqueous polymerization of acrylamide initiated by the redox system Ce(1V)-thioglycolic acid has been studied at 35 ± 0.2°C. The pH measurement shows that a 1:1 metal:ligand complex is formed between Ce(IV) and thioglycolic acid (TGA). The rate of polymerization is given by RP=K[M]1.08[Ce4+]0.65[TGA]° The overall energy of activation has been found to be 4.56 kcal/ deg/mol (19.06 kJ/mol). The number-average molecular weight (M n) of the polymer is directly proportional to the rate of polymerization. The M n of the polymer decreases with increasing concentration of both Ce4+ and DMF.
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Misra et al. (1981) studied this question.
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