Wang Chengyu, Mao Long, Zheng Bowen, Liu Yujie, Yao Jin, Zhu Heping
Key Laboratory of Advanced Packaging Materials and Technology of Hunan Province, Hunan University of Technology, Zhuzhou 412007, China.
Fujian Provincial Key Laboratory of Functional Materials and Applications, Xiamen University of Technology, Xiamen 361024, China.
Polymers (Basel). 2024 Mar 7;16(6):727. doi: 10.3390/polym16060727.
In order to solve the problems of insufficient active functions (antibacterial and antioxidant activities) and the poor degradability of traditional plastic packaging materials, biodegradable chitosan (CS)/polyvinyl alcohol (PVA) nanocomposite active films reinforced with natural plant polyphenol-quercetin functionalized layered clay nanosheets (QUE-LDHs) were prepared by a solution casting method. In this study, QUE-LDHs realizes a combination of the active functions of QUE and the enhancement effect of LDHs nanosheets through the deposition and complexation of QUE and copper ions on the LDHs. Infrared and thermal analysis results revealed that there was a strong interface interaction between QUE-LDHs and CS/PVA matrix, resulting in the limited movement of PVA molecules and the increase in glass transition temperature and melting temperature. With the addition of QUE-LDHs, the active films showed excellent UV barrier, antibacterial, antioxidant properties and tensile strength, and still had certain transparency in the range of visible light. As QUE-LDHs content was 3 wt%, the active films exhibited a maximum tensile strength of 58.9 MPa, representing a significant increase of 40.9% compared with CS/PVA matrix. Notably, the UV barrier (280 nm), antibacterial () and antioxidant activities (DPPH method) of the active films achieved 100.0%, 95.5% and 58.9%, respectively. Therefore, CS/PVA matrix reinforced with QUE-LDHs has good potential to act as an environmentally and friendly active packaging film or coating.
为了解决传统塑料包装材料活性功能（抗菌和抗氧化活性）不足以及降解性差的问题，采用溶液浇铸法制备了用天然植物多酚 - 槲皮素功能化层状粘土纳米片（QUE-LDHs）增强的可生物降解壳聚糖（CS）/聚乙烯醇（PVA）纳米复合活性薄膜。在本研究中，QUE-LDHs通过QUE和铜离子在LDHs上的沉积和络合实现了QUE的活性功能与LDHs纳米片增强效果的结合。红外和热分析结果表明，QUE-LDHs与CS/PVA基体之间存在强烈的界面相互作用，导致PVA分子运动受限，玻璃化转变温度和熔点升高。随着QUE-LDHs的加入，活性薄膜表现出优异的紫外线阻隔、抗菌、抗氧化性能和拉伸强度，并且在可见光范围内仍具有一定的透明度。当QUE-LDHs含量为3 wt%时，活性薄膜的最大拉伸强度为58.9 MPa，与CS/PVA基体相比显著提高了40.9%。值得注意的是，活性薄膜的紫外线阻隔（280 nm）、抗菌（）和抗氧化活性（DPPH法）分别达到100.0%、95.5%和58.9%。因此，用QUE-LDHs增强的CS/PVA基体具有作为环保活性包装薄膜或涂层的良好潜力。
