Abstract
Recently, infrared spectrophotometry has been applied as a useful tool for the investigation of polymer transitions. The solid-state transition in styrene–methacrylic acid copolymer was studied by infrared method in the range of 23–170°C. From the temperature dependence of the peak absorbances of 1700- and 1745 cm−1 bands, transition at 120°C was detected, and its mechanism was presumed to be associated with the association-dissociation process of intermolecular force between chains, namely with the breakdown of intermolecular hydrogen bonding. These results are in good agreement with Andrews’ definition for polymer transitions (or Tg). Thus the transition at 120°C was interpreted by the normal thermodynamic equilibrium consideration.
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