Open Access

ARTICLE

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

by Jingjing Liao^1,2, Jinxing Li², Fuxian Yang², Yan Zhu², Hongyan Wang³, Guanben Du^1,2,*, Hisham Essawy⁴, Xiaojian Zhou^2,*

1 Beijing Forestry University, Beijing, 100083, China
2 Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming, 650224, China
3 Zhejiang Academy of Forestry, Hangzhou, 310023, China
4 Department of Polymers and Pigments, National Research Centre, Cairo, 12622, Egypt

* Corresponding Authors:Xiaojian Zhou. Email: ; Guanben Du. Email:

(This article belongs to the Special Issue: Food Packaging Materials Based on Renewable Resources)

Journal of Renewable Materials 2022, 10(2), 359-372. https://doi.org/10.32604/jrm.2021.016335

Received 26 February 2021; Accepted 07 April 2021; Issue published 30 August 2021

Abstract

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

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