目的 利用负载有茶多酚（TP）的蒙脱土（MMT）对聚乙烯醇（PVA）改性制备出PVA复合膜，以期改善纯PVA膜的综合性能，从而替代传统包装膜。方法 利用溶液流延法制备不同茶多酚（TP）质量分数的PVA/MMT复合膜（MMT添加量为PVA质量的3.0%），测试其耐水性能、力学性能、水蒸气阻隔性能及抗氧化性能等。结果 当茶多酚质量分数为3.0%时，其溶胀率、溶解质量损失率分别约为532%和12.3%，水蒸气透过率系数约为1.0×10−10 g•m/(m2•Pa•s)；抗张强度相对于PVA/MMT复合膜增强了约26%，断裂伸长率下降明显；PVA/MMT/TP复合膜的DPPH自由基清除率达到了65.5%。结论 采用蒙脱土负载茶多酚可有效改性PVA基复合膜。

The work aims to prepare PVA composite films by means of montmorillonite (MMT) incorporated with tea polyphenols (TP) as modified agent, expecting to improve comprehensive properties of pure PVA film, so as to replace the traditional packaging film. The solution casting method was used to prepare the PVA/MMT composite films with different mass fractions of TP (the additive amount of MMT was equivalent to 3.0% of PVA mass). The properties of PVA/MMT composite films were analyzed, including water resistance, mechanical properties, water vapor barrier properties and ox-idation resistance. Results showed that, when the mass fraction of TP was 3.0%, the swelling rate and solution weight loss rate were about 532% and 12.3%, respectively, the water vapor permeability coefficient was about 1.0×10−10 g•m/(m2•Pa•s); tensile strength increased by approximately 26% compared to PVA/MMT composite films, but the elongation at break decreased obviously; and the DPPH free radical scavenging rate of PVA/MMT/TP composite films reached 65.5%. Hence, MMT incorporated with TP is an effective method for improving PVA-based composite films.