Abstract
Thermal-dependent six-membered cyclic anhydrides were formed in the Eudragit E and polyvinyl alcohol (PVA) copolymer via intramolecular ester condensation by using differential scanning calorimeter (DSC)-Fourier transform infrared microspectroscopy. The temperature for intramolecular ester condensation was started from 180 °C for Eudragit E, but from 167 °C for PVA copolymer. The amount of intramolecular anhydride formed in the film of Eudragit E was found to be higher than that formed in the film of PVA copolymer during the heating process.
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