Improved mechanical and antibacterial properties of polyvinyl alcohol composite films using quaternized cellulose nanocrystals as nanofillers

被引:30
作者
Meng, Lina [1 ]
Li, Jiangwei [1 ]
Fan, Xinyan [1 ]
Wang, Yonggui [1 ]
Xiao, Zefang [1 ]
Wang, Haigang [1 ]
Liang, Daxin [1 ]
Xie, Yanjun [1 ]
机构
[1] Northeast Forestry Univ, Coll Mat Sci & Engn, Key Lab Biobased Mat Sci & Technol Minist Educ, Hexing 26 Rd, Harbin 150040, Peoples R China
基金
中国国家自然科学基金;
关键词
A; Polymer-matrix composites (PMCs); Bio composites; B; Multifunctional properties; Interface; CHEMICAL-MODIFICATION; SURFACE MODIFICATION; NANOCOMPOSITES; NANOCELLULOSE; FIBERS;
D O I
10.1016/j.compscitech.2022.109885
中图分类号
TB33 [复合材料];
学科分类号
摘要
Cellulose nanocrystals (CNC) are natural, renewable, and biocompatible materials that have been widely used as new sustainable reinforcing nanofillers in polymer composites. We present polyvinyl alcohol (PVA)/CNC com-posites with improved mechanical and antibacterial properties using CNC-based nanofillers. The surface ester-ified CNC (ECNC) was prepared by 6-bromohexanoyl chloride via surface esterification. Subsequently, the alkyl bromide group of the ECNC was transferred to quaternary ammonium groups for preparing quaternized CNC (ECNC-Qn) by introducing tertiary amino groups with different carbon chain lengths (C8-C16). Then, ECNC-Qn were blended with a PVA matrix to prepare PVA/ECNC-Qn nanocomposite films via a solvent casting procedure. Diverse features, including light transmission, mechanical properties, and antibacterial activity against Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria were investigated. Compared with pure PVA films, the PVA/ECNC-Qn nanocomposite films had higher tensile strength and higher antibacterial activity. Specifically, the maximum tensile strength and elongation at break of PVA/ECNC-Qn nanocomposite films were 45.4 MPa and 318.4%, respectively, which were 37.2% and 94.3% higher than those of pure PVA film, respectively. Moreover, the ECNC-Q8 exhibited the highest antibacterial efficiency, leading to the best anti-bacterial activity for PVA/ECNC-Q8 nanocomposite films among all films. This study demonstrates an efficient method for preparing a functional, environment-friendly PVA composite film. The prepared PVA/ECNC-Qn nanocomposite films exhibited considerable application potential in the packaging field, owing to their good mechanical and antibacterial barrier properties.
引用
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页数:10
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