This study investigates the potential complications in applying nanoclay-based waterborne coating to packaging films for food with high moisture content. Multilayer packaging films were prepared by dry laminating commercially available polyvinyl alcohol (PVA)/vermiculite nanocomposite coating films and linear low-density polyethylene film, and the changes in oxygen barrier properties were investigated according to different relative humidity using 3 types of food simulants. When the relative humidity was above 60%, the oxygen permeability increased sharply, but this was reversible. Deionized water and 3% acetic acid did not cause any large structural change in the PVA/vermiculite nanocomposite but caused a reversible deterioration of the oxygen barrier properties. In contrast, 50% ethanol, a simulant for the semifatty food, induced irreversible structural changes with deterioration of the oxygen barrier property. These changes are due to the characteristics of PVA rather than vermiculite. PRACTICAL APPLICATION We believe this manuscript would be of interest to the wide group of researchers, organizations, and companies in the field of developing nanoclay-based gas barrier packaging for foods with high moisture content. Hence, we wish to diffuse our knowledge to the scientific community.

中文翻译：

---

高水分食品对聚乙烯醇（PVA）/蛭石纳米复合涂层多层包装膜阻氧性能的影响

本研究调查了将纳米粘土水性涂料应用于高水分食品包装薄膜的潜在并发症。采用市售聚乙烯醇（PVA）/蛭石纳米复合涂层薄膜和线性低密度聚乙烯薄膜干法复合制备多层包装薄膜，并使用3种食品模拟物研究了不同相对湿度对氧气阻隔性能的变化。当相对湿度在60%以上时，透氧性急剧增加，但这是可逆的。去离子水和 3% 乙酸不会导致 PVA/蛭石纳米复合材料发生任何大的结构变化，但会导致阻氧性能的可逆恶化。相比之下，50% 乙醇，一种半脂肪食品的模拟物，引起不可逆的结构变化，氧阻隔性变差。这些变化是由于 PVA 而不是蛭石的特性。实际应用 我们相信这份手稿会引起在开发用于高水分含量食品的基于纳米粘土的气体阻隔包装领域的广大研究人员、组织和公司的兴趣。因此，我们希望将我们的知识传播给科学界。