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A Study on the Nonsteady-State Kinetics of Spontaneous Polymerization of Acrylamide Complexes with Yttrium(III) Nitrate Hexahydrate at 20-50 ° C

The kinetics of spontaneous polymerization at 20-50 ° C of acrylamide bound coordinately to the nitrate salt Y(NO 3 ) 3 · 6H 2 O was studied through the calorimetric technique in combination with chemical inhi- bition. It was found that the initiation rate of spontaneous polymerization at 28 ° C was 4 〈 10 -10 mol/(l s) in glass cells but three orders of magnitude higher in aluminum cells. It was assumed that the observed effect was due to the involvement, in the initiation, of hydrogen atoms produced in the reaction of aluminum with the com- ponents of the mixture. The activation energy of initiation of spontaneous polymerization is 83 kJ/mol. The rate constant of polymer chain growth for the complex-bound acrylamide is almost the same as that for the solution polymerization of acrylamide. A model scheme for spontaneous polymerization was proposed, which agrees well with the experimental data.