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Advanced filters: Author: Yen-Shan Wei Clear advanced filters

  • 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.

    • Shan-Yang Lin
    • Wen-Ting Cheng
    • Hong-Liang Lin
    Research
    Polymer Journal
    Volume: 43, P: 577-580