PBAT/EVOH共混薄膜的制备及其包装特性

Preparation of PBAT/EVOH Blend Film and Its Packaging Characteristics

通过熔融共混挤出法制备不同质量比（9：1、8：2和7：3）的聚己二酸-对苯二甲酸丁二酯/乙烯乙烯醇共聚物（PBAT/EVOH）共混薄膜,研究EVOH的添加量对PBAT薄膜的力学性能、热学性能及阻隔性能的影响。结果表明：PBAT和EVOH共混体系是热力学不相容体系,随着EVOH添加量的增加,其氧气透过系数（OP）和水蒸气透过系数（WVP）逐渐降低。当添加30%的EVOH时,共混薄膜的OP和WVP达到最低值1.12×10^（-7） cm3·m/（m2·d·Pa）和1.19×10^（-7） g·m/（m2·d·Pa）,较纯PBAT薄膜分别降低66.8%和67.1%,说明EVOH的添加显著提高了薄膜的阻隔性能;10%EVOH不仅能使PBAT保持较好的韧性,还增强了薄膜的刚性,改善PBAT极易变形现象。

The different mass ratio（9：1,8：2 and 7：3）of PBAT/EVOH blend films were prepared by melt extrusion.The effects of EVOH on mechanical,thermal and barrier properties of PBAT/EVOH blend film were investigated.The results show that：the blend system of PBAT and EVOH is a thermodynamic incompatible system.With the increase of EVOH addition,the oxygen permeability coefficient（OP）and water vapor transmission coefficient（WVP）gradually decrease.When adding 30%EVOH,the OP and WVP of blend film reach to the lowest value of1.12×10^（-7） cm3·m/（m2·d·Pa）and 1.19×10^（-7） g·m/（m2·d·Pa）,66.76%and 67.13%lower than that of the pure PBAT films,indicating that the barrier properties of PBAT are significantly improved.10%EVOH can not only make PBAT maintain good toughness,but also enhance the rigidity of the film,and improve the PBAT deformation.