Chaobo Liang, Qiangqiang Huo, Jiamin Qi, Yali Zhang, Chunlei Liu, Yaqing Liu* and Junwei Gu*. Robust solid-solid phase change coating encapsulated glass fiber fabric with electromagnetic interference shielding for thermal management and message encryption. Advanced Functional Materials, 2024, 34: 202409146. 2023IF=18.5

https://doi.org/10.1002/adfm.202409146

Abstract

Electromagnetic interference (EMI) shielding composites with both thermal response/management functions and message transfer/encryption behavior are ideal for use in fields such as aerospace, construction engineering, and military equipment. In this work, we have prepared a self-crosslinking supramolecular solid-solid phase change polyethylene glycol (ScPEG) coating based on multiple hydrogen bonds, which is used for encapsulating glass fiber fabric (GFF) modified with silver nanowires (AgNWs). The solid-solid phase change coating is obtained through the hydrolysis-condensation of PEG with a reactive silanol end group. Polyethylene glycol molecular chains can store and release heat by switching between the crystalline and amorphous state. The silanol groups can form supramolecular networks through the physical cross-linking of multiple hydrogen bonds, resulting in an excellent thermal stability. In particular, hydrogen bonds between ScPEG and AgNW-modified GFF (A-GFF) enhance interfacial interactions, and the resulting robust structure enables an efficient stress transfer. ScPEG-coated A-GFF can achieve a tensile strength of up to 191 MPa and a tunable EMI shielding effectiveness (SE) of 40 to 72 dB depending on the number of fabric layers. Moreover, the fabric exhibits a flexible thermal response characteristic, an outstanding thermal management capability, and potential message encryption behavior.

兼具热响应/管理功能和信息传递/加密行为的电磁屏蔽复合材料是航空航天、建筑工程、军事装备领域的理想候选者。本工作制备了一种基于多重氢键作用的超分子固-固相变聚乙二醇（ScPEG）涂层，并被用于封装银纳米线（AgNWs）修饰的玻璃纤维织物（A-GFF）。ScPEG通过具有活性端基的聚乙二醇水解-缩合得到，其保留了原始聚乙二醇相变特性的同时具有优异的形状稳定能力。特别地，ScPEG、AgNWs和GFF之间的氢键有助于增强界面相互作用，由此产生的坚固结构使应力得以有效传递。经ScPEG封装的A-GFF可以实现高达191 MPa的拉伸强度，以及40到72 dB的可调谐EMI屏蔽效能。此外，织物表现出灵活的热响应特性、突出的热管理能力、以及有潜力的信息加密行为。

论文亮点

1. 基于多重氢键自交联的超分子固固相变聚乙二醇涂层封装玻璃纤维织物，同步赋予织物优异的电磁屏蔽性能、灵活的热响应特性、突出的热管理能力、以及有潜力的信息加密行为。

2. 相变涂层、银纳米线和玻璃纤维织物之间的氢键有助于增强界面相互作用，由此产生的坚固结构可以实现高达191 MPa的拉伸强度，以及40到72 dB的可调谐屏蔽效能。

3. 利用玻璃纤维织物制备的层合板通过特殊的阵列工艺控制，可以实现高达29种信息组合，同时在特定的温度窗口下可以实现信息的加密与释放。

第一作者：梁超博

邮件地址：lcb@nuc.edu.cn

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