High gas barrier of clay/graphene oxide/chitosan multilayer nanocoatings at high humidity

IF 6.5 2区材料科学 Q1 CHEMISTRY, APPLIED Progress in Organic Coatings Pub Date : 2024-11-16 DOI:10.1016/j.porgcoat.2024.108929

Alessia Cabrini , Sarah G. Fisher , Ethan T. Iverson , Pierfrancesco Cerruti , Luigi De Nardo , Gennaro Gentile , Marino Lavorgna , Jaime C. Grunlan

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Abstract

Improving the barrier properties of bio-based polymers is very desirable for food packaging applications. With this in mind, a gas barrier thin film comprised of graphene oxide (GO), montmorillonite (MMT) clay, and chitosan (CH) was prepared using layer-by-layer assembly. A 120 nm thick CH/MMT/CH/GO quadlayer nanocoating reduces the oxygen permeability of a 179 μm polyethylene terephthalate sheet from 17.6×10⁻¹⁶ to 0.21×10⁻¹⁶ cm³ cm cm⁻² s⁻¹ Pa⁻¹ at 0 % RH, and from 13.4×10⁻¹⁶ to 0.42×10⁻¹⁶ cm³ cm cm⁻² s⁻¹ Pa⁻¹ at 90 % RH. This two orders of magnitude reduction in permeability in both dry and high humid conditions is caused by the hybrid multilayer structure, with a high loading of oriented, densely packed nanoplatelets. This study demonstrates the potential of combining different anionic nanoplatelets in the assembled nanocoatings to improve the gas barrier performance of chitosan at high humidity.

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粘土/氧化石墨烯/壳聚糖多层纳米涂层在高湿度条件下的高气体阻隔性

在食品包装应用中，提高生物基聚合物的阻隔性能是非常理想的。有鉴于此，我们采用逐层组装法制备了一种由氧化石墨烯 (GO)、蒙脱石 (MMT) 粘土和壳聚糖 (CH) 组成的气体阻隔薄膜。在 0 % 相对湿度条件下，120 nm 厚的 CH/MMT/CH/GO 四层纳米涂层可将 179 μm 聚对苯二甲酸乙二醇酯薄片的氧气渗透率从 17.6×10-16 降至 0.21×10-16 cm3 cm-2 s-1 Pa-1；在 90 % 相对湿度条件下，氧气渗透率从 13.4×10-16 降至 0.42×10-16 cm3 cm-2 s-1 Pa-1。在干燥和高湿度条件下，渗透率都降低了两个数量级，这是因为混合多层结构中含有大量定向、密集排列的纳米片。这项研究表明，在组装的纳米涂层中结合不同的阴离子纳米颗粒可以提高壳聚糖在高湿度条件下的气体阻隔性能。

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来源期刊

Progress in Organic Coatings 工程技术-材料科学：膜

CiteScore

11.40

自引率

15.20%

发文量

577

审稿时长

48 days

期刊介绍： The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as: • Chemical, physical and technological properties of organic coatings and related materials • Problems and methods of preparation, manufacture and application of these materials • Performance, testing and analysis.