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.
兼具熱響應/管理功能和信息傳遞/加密行為的電磁屏蔽復合材料是航空航天、建筑工程、軍事裝備領域的理想候選者。本工作制備了一種基于多重氫鍵作用的超分子固-固相變聚乙二醇（ScPEG）涂層，并被用于封裝銀納米線（AgNWs）修飾的玻璃纖維織物（A-GFF）。ScPEG通過具有活性端基的聚乙二醇水解-縮合得到，其保留了原始聚乙二醇相變特性的同時具有優異的形狀穩定能力。特別地，ScPEG、AgNWs和GFF之間的氫鍵有助于增強界面相互作用，由此產生的堅固結構使應力得以有效傳遞。經ScPEG封裝的A-GFF可以實現高達191 MPa的拉伸強度，以及40到72 dB的可調諧EMI屏蔽效能。此外，織物表現出靈活的熱響應特性、突出的熱管理能力、以及有潛力的信息加密行為。
論文亮點
1. 基于多重氫鍵自交聯的超分子固固相變聚乙二醇涂層封裝玻璃纖維織物，同步賦予織物優異的電磁屏蔽性能、靈活的熱響應特性、突出的熱管理能力、以及有潛力的信息加密行為。
2. 相變涂層、銀納米線和玻璃纖維織物之間的氫鍵有助于增強界面相互作用，由此產生的堅固結構可以實現高達191 MPa的拉伸強度，以及40到72 dB的可調諧屏蔽效能。
3. 利用玻璃纖維織物制備的層合板通過特殊的陣列工藝控制，可以實現高達29種信息組合，同時在特定的溫度窗口下可以實現信息的加密與釋放。
第一作者：梁超博
郵件地址：[email protected]
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