Thermal behaviour of films of partially neutralized poly(acrylic acid). 2: The influence of univalent cations

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Abstract
Further studies have been carried out on the thermal behaviour of partially neutralized poly(acrylic acid), using ammonium or sodium ions as the neutralizing species. It was found that, unlike the partial poly(acrylates) of lithium, sodium or potassium, partially neutralized ammonium poly(acrylate) did not undergo thermal decarboxylation on heating to 250°C. Instead, the anhydride groups, formed by reaction of the unneutralized portions of the poly(acrylic acid) macromolecule, underwent no further reaction. On the other hand, further study of the decarboxylation of 10% neutralized sodium poly(acrylate) has shown the process to be first‐order in anhydride groups, with a rate constant of 2 23 × 10‐3 s−1 at 250×C. A mechanism consistent with the kinetic data is proposed to account for the overall sequence leading to decarboxylation.

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