[Composites Part A]Multifunctional sponges with flexible motion sensing and outstanding thermal insulation for superior electromagnetic interference shielding
作者：Chaobo Liang#, Yuxuan Liu#, Yifeng Ruan, Hua Qiu*, Ping Song, Jie Kong, Haobin Zhang and Junwei Gu*
關鍵字：electromagnetic interference shielding
論文來源：期刊
發表時間：2020年
Although electrically conductive polymer composites (ECPCs) are promising in the application of electromagnetic interference (EMI) shielding, how to endow the ECPCs multifunctionality is still a huge challenge. In this work, the novel polyurethane@polydopamine@silver nanoparticles (PU@PDA@Ag) sponges with excellent compressibility, flexible motion sensing, outstanding thermal insulation and superior EMI shielding properties were successfully fabricated by a facile bio-response method, which could be obtained by following two steps: (i) PDA was decorated on the surface of PU sponges by dopamine self-polymerization. (ii) Ag nanoparticles were in-situ grown on the surface of PU sponges by electroless plating. PU@PDA@Ag sponge had the maximum EMI shielding effectiveness (SE) of 84 dB, and the corresponding specific SE and absolute SE were 2625 dB cm3 g-1 and 5250 dB cm2 g-1, much higher than those of other shielding foams/sponges. Meanwhile, PU@PDA@Ag sponge possessed low thermal conductivity (52.72 mW/mK), excellent compression resilience and piezoresistive properties.
如何制造輕質、良好柔韌性、優異絕熱和電磁干擾（EMI）屏蔽性能的導電聚合物復合材料（ECPCs）是一項巨大的挑戰。本文中，我們通過簡單的生物響應法制備了一種超輕、出色可壓縮回彈、運動感知、優異絕熱和EMI屏蔽性能的聚氨酯@聚多巴胺@銀納米粒子（PU@PDA@Ag）海綿，其可通過兩步獲得：(ⅰ) 多巴胺自聚裝飾在PU海綿表面；(ⅱ) 利用PDA的活性位點，通過化學電鍍使Ag納米粒子原位生長在PU表面。PU@PDA@Ag海綿具有高達84 dB的EMI效能（SE）值，對應的比屏蔽效能（SSE）和絕對屏蔽效能（SSEt）分別為2631 dB cm3/g和5263 dB cm2/g，幾乎優于所有報道的泡沫/海綿的SSE和SSEt。此外，PU@PDA@Ag海綿同時具有超低的密度（0.0226～0.0320 g/cm3）和導熱系數（52.72～63.54 mW/mK），出色的壓縮回彈性以及壓阻特性。出色的綜合性能使PU@PDA@Ag海綿有望應用在輕質、柔性EMI屏蔽領域，如柔性電子設備、智能傳感器、航空航天工程以及軍事防御系統。