Abstract
The kinetics of thermal decomposition of polyacrylamide under a nitrogen atmosphere are studied in the presence of adsorbed metal ions using rising temperature thermogravimetry. Results are analysed using the method of Coates and Redfern 15 and indicate that all of the metal ions, except Tl(I), Hg(I) and Ni(II), stabilize the polymer against degradation. Attempts are made to correlate both initial and total activation energies for degradation with various parameters, including reciprocal ionic radii, ionization potentials, electronegativity and ligand field stabilization energy, to obtain a better understanding of the mechanism of stabilization. The best correlations are between the total activation energy and either reciprocal ionic radii, or the Kahwa-Mulokozi function involving covalent and ionic radii, and ionization potentials. It is suggested that both covalent and ionic interactions in the polymer-metal ion complexes may be important in the stabilization.
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