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Preparation of formyl cellulose and its enhancement effect on the mechanical and barrier properties of polylactic acid films

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Long, Shuangyan, Zhong, Lei, Lin, Xuliang, Chang, Xiaogang, Wu, Fuqi, Wu, Ruchun and Xie, Fengwei (2021) Preparation of formyl cellulose and its enhancement effect on the mechanical and barrier properties of polylactic acid films. International Journal of Biological Macromolecules, 172 . pp. 82-92. doi:10.1016/j.ijbiomac.2021.01.029 (In Press)

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Official URL: https://doi.org/10.1016/j.ijbiomac.2021.01.029

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Abstract

Cellulose was modified by formic acid to prepare formyl cellulose (FC). The amount of formyl groups in FC was adjusted by controlling the reaction time, reaction temperature, and formic acid concentration. Then, FC was used to reinforce polylactic acid (PLA) films prepared by solution casting. Scanning electron microscopy (SEM) shows that long rod-like cellulose particles were broken into short rods after formylation and the introduction of FC made PLA surface rougher. The mechanical properties of PLA/FC films were improved by the inclusion of FC. Compared to pure PLA film, the PLA/FC composite film with 1 wt% FC (containing 15.79% formyl groups) showed a 48.59% increase in tensile strength and a 346% increase in Young's modulus. The addition of FC also resulted in better water barrier properties. The moisture absorption capacity and water vapor permeability were 40.56% and 51.43% lower than those of the pure-PLA film. The enhancement in properties for PLA/FC composites could be ascribed to the improved compatibility between PLA and cellulose with the introduction of hydrophobic formate groups. The PLA/FC composite films developed in this work could be highly potential for food packaging.

Item Type: Journal Article
Subjects: Q Science > QH Natural history
T Technology > TP Chemical technology
T Technology > TS Manufactures
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Polylactic acid , Cellulose , Scanning electron microscopy, Plastics in packaging
Journal or Publication Title: International Journal of Biological Macromolecules
Publisher: Elsevier
ISSN: 0141-8130
Official Date: 1 March 2021
Dates:
DateEvent
1 March 2021Published
9 January 2021Available
6 January 2021Accepted
Date of first compliant deposit: 15 January 2021
Volume: 172
Page Range: pp. 82-92
DOI: 10.1016/j.ijbiomac.2021.01.029
Status: Peer Reviewed
Publication Status: In Press
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
21868008[NSFC] National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809

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