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Acrylic resins containing acrylic acid (AA), methyl methacrylate (MMA) or acrylic–methacrylic copolymer are the most commonly used polymeric materials for biomedical and pharmaceutical applications owing to their hydrophilicity and biocompatibility.1, 2, 3, 4 Recently, a new polyvinyl alcohol (PVA) copolymer designed by copolymerizing AA and MMA with PVA was successfully developed as a capsule shell for filling liquid formulations to enhance the bioavailability of water-insoluble drugs.5, 6, 7 PVA was used as a skeleton in the structure of PVA copolymer; MMA and AA were separately copolymerized to increase the hardness of the capsule shell and the solubility in water. Furthermore, the PVA copolymer has also been reported to act as a binder or film-coating agent in pharmaceutical applications. In particular, the oxygen-blocking and light-protective properties of PVA copolymer film have increased its usage in the pharmaceutical industry. The stability of PVA copolymer is another important factor for pharmaceutical applications.

DSC-FTIR microspectroscopy used to investigate the heat-induced intramolecular cyclic anhydride formation between Eudragit E and PVA copolymer