Preparation and characterization of high barrier coating of citric acid crosslinked polyvinyl alcohol and nano-SiO2

IF 2.3 4区材料科学 Q2 CHEMISTRY, APPLIED

Journal of Coatings Technology and Research Pub Date : 2024-04-09 DOI:10.1007/s11998-024-00930-7

Kexin Liu, Shuting Huang, Fang Duan, Jun Wang

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Abstract

Polyvinyl alcohol (PVA) coating has attracted intense attention due to its biodegradability and high gas barrier properties. However, the high gas barrier properties deteriorate at elevated humidity. Herein, we aimed to prepare PVA based coating with high water resistance by incorporating nano-SiO₂ (S) and citric acid (CA), and polyethylene (PE) film was selected as a substrate model. The results showed that the PVA/S/CA coated PE films had better water vapor and oxygen barrier performance than the uncoated PE films. With an optimized mass ratio (PVA/S/CA_10%), the coated PE films’ water vapor permeability decreased by 46.53% at 90% RH, and the oxygen permeability decreased by four orders of magnitude at 0% relative humidity (RH). Besides, increased surface roughness and a more hydrophobic surface were observed in the coated PE films. Overall, these coated PE films still retained high transparency and were mechanically robust, making them potential candidates for the flexible food packaging field.

Graphical abstract

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柠檬酸交联聚乙烯醇和纳米二氧化硅高阻隔涂层的制备与表征

聚乙烯醇（PVA）涂层因其生物降解性和高气体阻隔性而备受关注。然而，高气体阻隔性在湿度升高时会变差。本文旨在通过加入纳米二氧化硅（S）和柠檬酸（CA）制备具有高耐水性的 PVA 基涂层，并选择聚乙烯（PE）薄膜作为基底模型。结果表明，PVA/S/CA 涂层聚乙烯薄膜的水蒸气和氧气阻隔性能优于未涂层的聚乙烯薄膜。优化质量比（PVA/S/CA10%）后，涂覆聚乙烯薄膜在 90% 相对湿度下的水蒸气透过率降低了 46.53%，在 0% 相对湿度下的氧气透过率降低了四个数量级。此外，还观察到涂覆聚乙烯薄膜的表面粗糙度增加，表面更疏水。总体而言，这些涂布聚乙烯薄膜仍然保持了较高的透明度和机械坚固性，是食品软包装领域的潜在候选材料。

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来源期刊

Journal of Coatings Technology and Research 工程技术-材料科学：膜

CiteScore

4.30

自引率

8.70%

发文量

130

审稿时长

2.5 months

期刊介绍： Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.