Abstract
An alternating styrene-maleic anhydride copolymer was hydrolysed to obtain styrene-maleic acid copolymer. The degradation of the product was studied and the thermal stability of hydrolysed copolymer compared with that of parent copolymer. It was found that alternating styrene-maleic acid copolymer degraded in three stages. FTIR spectra of heated film of copolymer as well as mass spectrometry of volatile products of the decomposition indicate that dehydration is the main reaction, which takes place at the first stage of degradation. However, the decomposition is not only the simple regeneration of the maleic anhydride units. Heating of the styrene-maleic acid copolymer to 250 °C causes an increase of its glass temperature in comparison to T g of the parent copolymer. During heating at 140 °C the hydrolysed styrene-maleic acid copolymer loses its solubility in polar solvents, presumably due to crosslinking. The volatile products of the last two stages of degradation were studied by mass spectrometry.
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