Abstract

Infrared (IR) and ultraviolet (UV) spectroscopy was used to study the kinetics of thermal-oxidative degradation of polyvinyl alcohol (PVALC) and PVB having different degrees of substitution. An increase in the butyral units in PVALC was found to reduce the length of the polyene systems formed during heat treatment. The rate of formation of the polyene systems and of carbonyls in the PVB greatly depended on the content of butyral groups and the reaction temperature. The formation of these systems can be divided into two stages characterized by different rates.

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