茶多酚对壳聚糖/聚乙烯醇复合膜性能的影响

Effect of Tea Polyphenols on Properties of Chitosan/Polyvinyl Alcohol Composite Films

目的以茶多酚为改性剂对壳聚糖/聚乙烯醇复合膜进行共混改性,制备一种综合性能良好的绿色包装材料。方法采用溶液共混法制备不同茶多酚质量分数的壳聚糖/聚乙烯醇复合膜,并对其进行红外光谱分析,以及力学性能、水溶性、气体阻隔性、抗氧化性能的测试。结果茶多酚与壳聚糖/聚乙烯醇基质间发生了分子间相互作用,当茶多酚的质量分数为2%时复合膜的综合性能最好,拉伸强度提高了4.99%,且可保持较高的断裂伸长率,水溶性、水蒸气透过率和氧气透过率分别降低了82.43%,51.40%和72.77%,抗氧化能力增强了58.54%。结论添加适量的茶多酚能够提高壳聚糖/聚乙烯醇复合膜的力学性能和耐水性,并改善其气体阻隔性和抗氧化性能。

The work aims to prepare a green packaging material with good comprehensive properties, with tea polyphenol（TP） as a modifier to modify chitosan（CS）/polyvinyl alcohol（PVA） composite films. The CS/PVA composite films with different TP mass fractions were prepared by solution blending, and the IR analysis on the composite films was done. The mechanical property, water solubility, gas barrier property and antioxidant activity were tested. The results showed that there were molecular interactions between TP and CS/PVA substrate. When the mass fraction of TP was 2%, the composite film had the best comprehensive property. The tensile strength was improved by 4.99%, and the elongation at break was at a relatively high level. Meanwhile, the water solubility, water vapor transmission rate and oxygen transmission rate of the CS/PVA composite film were decreased by 82.43%, 51.40% and 72.77%, respectively, and the antioxidant activity was increased by 58.54%. Proper addition of TP can enhance the mechanical properties and water resistance of CS/PVA composite films, and improve the gas barrier properti.