Solution Processable Barrier Films Using a Filled Polymer to Encapsulate Flexible Printed Electronics

IEEE Journal on Flexible Electronics Pub Date : 2024-12-05 DOI:10.1109/JFLEX.2024.3512473

Zehua Chen;Ulrich Gengenbach;Shant Gananian;Daniel Moser;Klaus-Martin Reichert;Liyu Huang;Liane Koker

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Abstract

Flexible printed electronics (FPEs) are gaining attention due to their diverse applications, including smart packaging and medical and wearable devices. A key aspect in ensuring the longevity and functionality of FPE devices is their encapsulation, which shields them from adverse environmental factors such as humidity and oxygen. One promising approach to achieve this is solution-processed encapsulation, where fillers are added to a polymer matrix to form barrier films. In this work, glass flakes (GFs), graphene oxide (GO), montmorillonite (MMT), and silica are investigated as possible fillers in poly(vinyl alcohol) (PVA). The barrier films are fabricated by doctor blading. To select the most effective filler type, a water vapor transmission rate (WVTR) test method based on an adapted desiccant method from the ASTM E96/E96M-22 standard is developed. The optimal filler concentration in PVA is also determined. The fabricated barrier films are optically inspected. Moreover, the barrier effect of selected PVA/filler films is validated by resistance measurements of inkjet-printed silver tracks subjected to damp heat and room storage conditions.

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使用填充聚合物封装柔性印刷电子器件的可溶液加工阻隔薄膜

柔性印刷电子（FPEs）由于其多样化的应用而受到关注，包括智能包装和医疗和可穿戴设备。确保FPE设备寿命和功能的一个关键方面是它们的封装，这可以保护它们免受不利环境因素（如湿度和氧气）的影响。实现这一目标的一种有希望的方法是溶液处理封装，将填料添加到聚合物基体中形成屏障膜。在这项工作中，研究了玻璃薄片（GFs）、氧化石墨烯（GO）、蒙脱土（MMT）和二氧化硅作为聚乙烯醇（PVA）中可能的填料。屏障膜是由医生叶片制造的。为了选择最有效的填料类型，基于ASTM E96/E96M-22标准中的适应性干燥剂方法，开发了一种水蒸气透过率（WVTR）测试方法。确定了PVA中填料的最佳浓度。对所制备的障膜进行光学检测。此外，通过湿热和室温条件下喷墨印刷银轨的电阻测量，验证了所选PVA/填料薄膜的阻隔效应。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IEEE Journal on Flexible Electronics

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