Barrier and structural properties of polyethylene terephthalate film coated with poly(acrylic acid)/montmorillonite nanocomposites,Packaging Technology and Science

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Barrier and structural properties of polyethylene terephthalate film coated with poly(acrylic acid)/montmorillonite nanocomposites
Packaging Technology and Science ( IF 2.8 ) Pub Date : 2020-11-22 , DOI: 10.1002/pts.2547
Ji Woo Lim ₁ , Woo Su Lim ₁ , Min Hyeock Lee ₂ , Hyun Jin Park ₁

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Food packaging is one of the most important parts of the food industry, and polyethylene‐based polymers have been widely used as food packaging films. In this study, corona‐treated polyethylene terephthalate (PET) films were used to increase adhesion to the barrier coating solution for multilayered film formation and various concentrations of montmorillonite (MMT; 0, 1, 3, and 5 wt.%) were used to improve the barrier properties of PET films for food packaging after different treatments of MMT including ultrasonication with bath or probe and 100‐W or 300‐W microwave to evenly disperse MMT. Among them, a 300‐W microwave treatment was most effective for size reduction of MMT particles. Even though 5 wt.% MMT was used to coat PET films with polyacrylic acid (PAA), good transmittance in the visible region (500 nm) was obtained, with a value similar to that of the neat PET film. The dispersion of MMT and binding of PAA/MMT nanocomposites were confirmed by field‐emission scanning electron microscopy, X‐ray diffraction, and Fourier transform infrared spectroscopy analyses. The water vapor and oxygen barrier properties of PET films were enhanced by PAA coating. Moreover, the oxygen permeability of PET films decreased via coating by PAA blended with 1 and 3 wt.% MMT. Based on these results, the PET film coated with PAA/MMT nanocomposites could be applied as food packaging films that require high gas barrier properties for oxygen‐sensitive food.

中文翻译：

聚丙烯酸/蒙脱土纳米复合材料包覆的聚对苯二甲酸乙二酯薄膜的阻隔和结构性能

食品包装是食品工业中最重要的部分之一，聚乙烯基聚合物已被广泛用作食品包装膜。在这项研究中，使用电晕处理过的聚对苯二甲酸乙二醇酯（PET）膜来增加与阻隔涂层溶液的粘附力，以形成多层膜，并使用各种浓度的蒙脱土（MMT; 0、1、3和5 wt。％）在对MMT进行不同处理之后，包括使用浴或探头进行超声波处理以及100-W或300-W微波以均匀分散MMT，可改善食品包装用PET膜的阻隔性能。其中，300 W微波处理对于减小MMT颗粒的尺寸最有效。即使使用5 wt。％MMT来用聚丙烯酸（PAA）涂覆PET膜，在可见光区域（500 nm）仍可获得良好的透射率，具有与纯PET膜相似的值。通过场发射扫描电子显微镜，X射线衍射和傅里叶变换红外光谱分析证实了MMT的分散和PAA / MMT纳米复合材料的结合。PAA涂层增强了PET薄膜的水蒸气和氧气阻隔性能。此外，通过与1和3重量％的MMT混合的PAA的涂覆，PET膜的透氧性降低。基于这些结果，涂有PAA / MMT纳米复合材料的PET膜可以用作对氧气敏感的食品要求高阻气性的食品包装膜。PAA涂层增强了PET薄膜的水蒸气和氧气阻隔性能。此外，通过与1和3重量％的MMT混合的PAA的涂覆，PET膜的透氧性降低。基于这些结果，涂有PAA / MMT纳米复合材料的PET膜可以用作对氧气敏感的食品要求高阻气性的食品包装膜。PAA涂层增强了PET薄膜的水蒸气和氧气阻隔性能。此外，通过与1和3重量％的MMT混合的PAA的涂覆，PET膜的透氧性降低。基于这些结果，涂有PAA / MMT纳米复合材料的PET膜可以用作对氧气敏感食品要求高阻气性的食品包装膜。

更新日期：2021-01-29

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