Effect of drying temperature on structural and thermomechanical properties of konjac glucomannan-zein blend films

Li, Chong; Wu, Kao; Su, Yuehong; Riffat, Saffa B.; Ni, Xuewen; Jiang, Fatang

Abstract

Konjac glucomannan (KGM)/zein blend films were successfully prepared by solution casting at different drying temperatures (40, 50, 60, 70 and 80 °C). The effects of drying temperature on the films' structural, thermomechanical, mechanical and water barrier properties were investigated. Microstructural observations indicated that zein particles were homogeneously dispersed in KGM continuous matrix, and the blend film dried at 60 °C showed the most compact and smooth surface. Dynamic mechanical thermal analysis curves showed that with increasing drying temperature from 40 to 60 °C, glass transition temperature (Tg) of films increased; however, with further increase in temperature, the Tg decreased, indicating the compatibility of film components was the highest when dried at 60 °C. The hydrophobicity of blend film dried at 60 °C was significantly stronger than that of other blend films, supported by the highest water contact angle, and the lowest swelling ratio and solubility. Moreover, the film dried at 60 °C showed the highest tensile strength, elongation at break, and the lowest water vapor permeability. Therefore 60 °C was preferred for KGM/zein blend film preparation. This study indicated that intermolecular interactions among film components were greatly influenced by the drying temperature, and should be carefully noticed for film preparation.

Citation

Li, C., Wu, K., Su, Y., Riffat, S. B., Ni, X., & Jiang, F. (2019). Effect of drying temperature on structural and thermomechanical properties of konjac glucomannan-zein blend films. International Journal of Biological Macromolecules, 138, 135-143. https://doi.org/10.1016/j.ijbiomac.2019.07.007

• Journal Article Type: Article
• Acceptance Date: Jul 1, 2019
• Online Publication Date: Jul 2, 2019
• Publication Date: Oct 1, 2019
• Deposit Date: Nov 9, 2020
• Publicly Available Date: Nov 10, 2020
• Journal: International Journal of Biological Macromolecules
• Print ISSN: 0141-8130
• Electronic ISSN: 1879-0003
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 138
• Pages: 135-143
• DOI: https://doi.org/10.1016/j.ijbiomac.2019.07.007
• Keywords: Biochemistry; Molecular Biology; Structural Biology; General Medicine
• Public URL: https://nottingham-repository.worktribe.com/output/5031220
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0141813019310402
• Additional Information: This article is maintained by: Elsevier; Article Title: Effect of drying temperature on structural and thermomechanical properties of konjac glucomannan-zein blend films; Journal Title: International Journal of Biological Macromolecules; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.ijbiomac.2019.07.007; Content Type: article; Copyright: © 2019 Elsevier B.V. All rights reserved.