Abstract
AbstractThe effect of hydrazine hydrate on the thermal properties of polyvinyl alcohol was investigated. It was proved that the presence of carbonyl groups in the polymer chain is responsible for the thermal instability of polyvinyl alcohol, and that hydrazine combines with the carbonyl group to protect the polymer against autoxidation and dehydration on the heat‐treatment. Hydrazine hydrate was suitable for prevention of colouring of polyvinyl alcohol on heating at about 200°C unless the carbonyl content is too high. Commercial polyvinyl alcohol was thus improved in the properties by the simple treating with hydrazine hydrate.
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