Assisted Compatibility, and Balanced Regulation of the Mechanical, Thermal, and Antioxidant Activity of Polyvinyl Alcohol-Chinese Bayberry Tannin Extract Films Using Different Di-Aldehydes as Cross-Linkers

Polyvinyl alcohol (PVA)-based films containing Chinese bayberry tannin (BT) were prepared by cross-linking using glyoxal, glutaraldehyde and dialdehyde starch, individually. The presence of cross-linkers was evident to promote the transparency decrease moisture content PVA/BT films, while water solubility stayed almost unchanged in cross-linked films. All provided promotion vapor permeability, mechanical property thermal stability best barrier capacity found case film, highest tensile strength encountered glyoxal compared with uncross-linked scavenging action towards DPPH radical activity influenced nature each cross-linker. Namely, PVA/AT film acquired lowest a certain time, suggesting that decreased release rate BT from PVA. Based on experimental data, starch could be more suitable for preparation since they can intermolecular interaction PVA reasonable extent.