Preparation and characterization of N-isopropyl acrylamide grafted polyvinyl alcohol and chitosan blend films with hydrophobic and antibacterial properties
文献类型： 外文期刊
作者： Liu, Fengsong 1 ; Cao, Yifang 1 ; Zhang, Yan 1 ; Xie, Yijia 1 ; Xu, Hao 1 ; Dong, XinYun 1 ; Liu, Yuanyuan 1 ; Wang, Qingyao 1 ; Jiao, Wenjuan 2 ; Alee, Mahafooj 1 ; Xiao, Xinglong 1 ;
作者机构： 1.South China Univ Technol, Sch Food Sci & Engn, Guangzhou 510640, Peoples R China
2.Guangdong Acad Agr Sci, Sericulture & Agrifood Res Inst, Key Lab Funct Foods, Guangdong Key Lab Agr Prod Proc,Minist Agr & Rural, Guangzhou 510610, Peoples R China
关键词： Hydrophobic modification; Water resistance; Light transmittance; Mechanical properties; Packaging materials
期刊名称：REACTIVE & FUNCTIONAL POLYMERS （ 影响因子：5.1； 五年影响因子：4.3 ）
ISSN： 1381-5148
年卷期： 2023 年 188 卷
页码：
收录情况： SCI
摘要： One of Polyvinyl alcohol (PVA) films' well-recognized weaknesses is moisture sensitivity, which limits their applications. Various techniques have been employed to improve their hydrophobicity, such as blending and hydrophobic coating, but they have shown issues with compatibility and stability. In this study, a new method was proposed to modify PVA by grafting N-isopropyl acrylamide (NIPA) and blending it with chitosan (CS) to enhance its hydrophobic and antibacterial properties. The chemical structure of PVA-NIPA was characterized by FT-IR, 1H NMR, and XRD. By forming chemical bonds between PVA and NIPA through Michael's addition re-action, the moisture sensitivity of the film was significantly reduced. Additionally, the contact angle (CA) increased to 107.85 degrees and the water vapor transmission rate (WVTR) decreased from 17.69 g / (m2 & BULL;h) to 6.53 g / (m2 & BULL;h). The PVA-NIPA/CS film also exhibited excellent mechanical properties, with Young's modulus of 303.67 MPa, tensile strength of 28.86 MPa, and elongation at break of 330.25%. Moreover, it showed better compati-bility, high transparency, good UV-blocking properties, and strong antibacterial activity against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), reducing the total colony counts by 2.53 and 3.44 logs, respec-tively. Thus, this work has generated new insights for expanding the application range of PVA films in packaging materials.
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