Highly Ordered Thermoplastic Polyurethane/Aramid Nanofiber Conductive Foams Modulated by Kevlar Polyanion for Piezoresistive Sensing and Electromagnetic Interference Shielding  

作　　者：Kunpeng Qian Jianyu Zhou Miao Miao Hongmin Wu Sineenat Thaiboonrod Jianhui Fang Xin Feng 

机构地区：[1]School of Materials Sciences and Engineering,Shanghai University,Shanghai 200444,People’s Republic of China [2]Research Center of Nano Science and Technology,Shanghai University,Shanghai 200444,People’s Republic of China [3]National Nanotechnology Center(NANOTEC),National Science and Technology Development Agency(NSTDA),Thailand Science Park,Pathum Thani 12120,Thailand

出　　处：《Nano-Micro Letters》2023年第6期335-352,共18页纳微快报（英文版）

基　　金：financially sponsored by the Science and Technology Commission of Shanghai Municipality (20230742300 and 18595800700);Key Laboratory of Resource Chemistry, Ministry of Education (KLRC_ME2103);the project of “joint assignment” in Shanghai University led by Prof. Tongyue Gao from School of Mechatronic Engineering and Automation。

摘　　要：Highly ordered and uniformly porous structure of conductive foams is a vital issue for various functional purposes such as piezoresistive sensing and electromagnetic interference(EMI) shielding. With the aids of Kevlar polyanionic chains, thermoplastic polyurethane(TPU) foams reinforced by aramid nanofibers(ANF) with adjustable pore-size distribution were successfully obtained via a nonsolvent-induced phase separation. In this regard, the most outstanding result is the in situ formation of ANF in TPU foams after protonation of Kevlar polyanion during the NIPS process. Furthermore, in situ growth of copper nanoparticles(Cu NPs) on TPU/ANF foams was performed according to the electroless deposition by using the tiny amount of pre-blended Ti_(3)C_(2)T_(x) MXene as reducing agents. Particularly, the existence of Cu NPs layers significantly promoted the storage modulus in 2,932% increments, and the well-designed TPU/ANF/Ti_(3)C_(2)T_(x) MXene(PAM-Cu) composite foams showed distinguished compressive cycle stability. Taking virtues of the highly ordered and elastic porous architectures, the PAM-Cu foams were utilized as piezoresistive sensor exhibiting board compressive interval of 0–344.5 kPa(50% strain) with good sensitivity at 0.46 kPa^(-1). Meanwhile,the PAM-Cu foams displayed remarkable EMI shielding effectiveness at 79.09 dB in X band. This work provides an ideal strategy to fabricate highly ordered TPU foams with outstanding elastic recovery and excellent EMI shielding performance, which can be used as a promising candidate in integration of satisfactory piezoresistive sensor and EMI shielding applications for human–machine interfaces.

关 键 词：Highly ordered conductive foams MXene NANOFIBER Thermoplastic Kevlar polyanion Piezoresistive sensing Electromagnetic interference shielding 

分 类 号：TQ317[化学工程—高聚物工业] O648.24[理学—物理化学]