Preparation of Nanocellulose Reinforced Chitosan Films, Cross-Linked by Adipic Acid

International Journal of Molecular Sciences

Pouria Falamarzpour¹  Tayebeh Behzad¹  Akram Zamani² 

[1] Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;Swedish Centre for Resource Recovery, University of Borås, 50190 Borås, Sweden;

关键词: acetic acid;    adipic acid;    chitosan;    cross-linking;    mechanical properties;    nanocomposite film;   

DOI  :  10.3390/ijms18020396

来源: DOAJ

【 摘 要 】

Adipic acid, an abundant and nontoxic compound, was used to dissolve and cross-link chitosan. After the preparation of chitosan films through casting technique, the in situ amidation reaction was performed at 80–100 °C as verified by Fourier transform infrared (FT-IR). The reaction was accompanied by the release of water which was employed to investigate the reaction kinetics. Accordingly, the reaction rate followed the first-order model and Arrhenius equation, and the activation energy was calculated to be 18 kJ/mol. Furthermore, the mechanical properties of the chitosan films were comprehensively studied. First, optimal curing conditions (84 °C, 93 min) were introduced through a central composite design. In order to evaluate the effects of adipic acid, the mechanical properties of physically cross-linked (uncured), chemically cross-linked (cured), and uncross-linked (prepared by acetic acid) films were compared. The use of adipic acid improved the tensile strength of uncured and chemically cross-linked films more than 60% and 113%, respectively. Finally, the effect of cellulose nanofibrils (CNFs) on the mechanical performance of cured films, in the presence of glycerol as a plasticizer, was investigated. The plasticized chitosan films reinforced by 5 wt % CNFs showed superior properties as a promising material for the development of chitosan-based biomaterials.

【 授权许可】

Unknown