基于层状硅酸镁锂纳米片体相增强聚甲基丙烯酸甲酯薄膜的水汽阻隔性能

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关键词：薄膜封装技术；纳米片；水汽透过率；有机改性 中图分类号：TN873 文献标识码：A doi：10.37188/CJLCD.2025-0202 CSTR：32172.14.CJLCD.2025-0202

Abstract： To address the loss of flexibility and increased risk of side penetration in commercially applied inorganic/organic composite encapsulation films—issues often resulting from overly thick organic layers， this study investigates strategies for synergistically optimizing the barier properties and interlayer adhesion of thinned organic layers.We constructed a thinned “sandwich-structured”composite film by incorporating synthesized lithium magnesium silicate （Laponite） nanosheets，both pristine and modified with cetyltrimethylammonium chloride（CTAC），into a polymethyl methacrylate（PMMA） matrix，which was then laminated with silicon nitride（ SiNx ）layers. The results demonstrate that the incorporated nanosheets significantly enhance the water vapor barrer performance by creating a tortuous diffsion path. Compared to the pristine Laponite system，the CTAC-modified nanosheets，owing to their hydrophobic surface and superior dispersion within the PMMA matrix，led to a remarkable improvement in the overall performance of the CTAC-Laponite-PMMA composite. The resulting film exhibited an ultra-low surface roughness of 0.312nm ，ensuring excellent interfacial adhesion with the adjacent inorganic layers. Consequently， the water vapor transmisson rate（WVTR） of the entire sandwich structure was further reduced to 5.90× （204号 10-5g/（m2⋅day） . This work demonstrates a novel approach to co-optimizing barrier properties and interfacial adhesion in thinned organic layers via organically modified nanosheets，ofering a promising pathway for developing high-performance，ultra-thin flexible encapsulation.

Key words： thin film encapsulation； nanosheets；water vapor transmission rate; organically modified

1引言

随着微电子与显示技术的持续迭代，显示器正朝着小型化、柔性化和可穿戴方向快速发展，有力推动了柔性有机发光二极管（OLED）等柔性显示技术的革新[1-5]。（剩余13682字）