Spray-coated polylactic acid/polyhydroxyalkanoate biodegradable bioplastic films on paper: A sustainable strategy for enhancing barrier and mechanical properties

IF 7.3 2区材料科学 Q1 CHEMISTRY, APPLIED

Progress in Organic Coatings Pub Date : 2025-09-22 DOI:10.1016/j.porgcoat.2025.109685

Chenxi Cao , Kihyeon Ahn , Su Jung Hong , Young-Teck Kim , Zunhuang He , Haibo Huang , Zhiwu Wang , Eunhye Lee , Yookyoung Shim

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Abstract

This study proposes a sustainable alternative to conventional plastic coatings in packaging by developing a biodegradable coating system based on polylactic acid (PLA) and polyhydroxyalkanoate (PHA). A novel spray coating technique followed by hot pressing was used to apply PLA/PHA blends onto kraft pulp paper. This approach aimed to enhance mechanical strength, barrier properties, and water resistance while maintaining compostability. The coating behavior was strongly influenced by the PLA to PHA ratio. PLA formed a dense surface layer that effectively sealed pores, while PHA penetrated more deeply into the fibrous matrix, filling internal voids. These complementary roles contributed differently to the mechanical and barrier properties. In particular, the 50:50 PLA/PHA blend showed the most balanced results, achieving the lowest oxygen transmission rate and improved tensile strength. The thermogravimetric analysis further confirmed enhanced thermal stability in all coated samples compared to uncoated paper, with the degradation temperature profile shifting depending on the polymer composition. However, coatings with excessive PHA content showed surface irregularities and reduced barrier performance due to poor film formation. Overall, this work demonstrates that compositional tuning of PLA and PHA enables multifunctional coatings with improved mechanical, thermal, and barrier properties. The proposed spray-based method offers a scalable, eco-friendly solution for high-performance biodegradable packaging.

查看原文本刊更多论文

喷涂聚乳酸/聚羟基烷酸酯可降解生物塑料纸膜：一种增强屏障和机械性能的可持续策略

本研究提出了一种可持续替代传统塑料包装涂料的方法，即开发一种基于聚乳酸（PLA）和聚羟基烷酸酯（PHA）的可生物降解涂料体系。采用一种新型的热压喷涂技术，将PLA/PHA共混物涂覆在牛皮纸纸浆上。这种方法旨在提高机械强度，屏障性能和耐水性，同时保持可堆肥性。PLA与PHA的比例对涂层性能有较大影响。PLA形成致密的表面层，有效地密封孔隙，而PHA深入纤维基质，填充内部空隙。这些互补作用对材料的力学性能和屏障性能有不同的贡献。特别是50:50的PLA/PHA共混物表现出最平衡的结果，实现了最低的氧透射率和提高的拉伸强度。热重分析进一步证实，与未涂布纸相比，所有涂布纸的热稳定性都有所提高，降解温度曲线随聚合物成分的变化而变化。然而，PHA含量过高的涂层由于成膜不良而表现出表面不规则和屏障性能降低。总的来说，这项工作表明PLA和PHA的成分调整可以使多功能涂层具有更好的机械、热和阻隔性能。提出的基于喷雾的方法为高性能可生物降解包装提供了可扩展的、环保的解决方案。

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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.