Liu Wan-Chen, Chung Chih-Hsiang, Hong Jin-Long
Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan.
ACS Omega. 2018 Sep 18;3(9):11368-11382. doi: 10.1021/acsomega.8b01456. eCollection 2018 Sep 30.
There is a growing interest in developing stretchable strain sensors to quantify the large mechanical deformation and strain associated with the activities for a wide range of species. Herein, we constructed elastomeric, healable hydrogen-bonded interpolymer complex (HIPC) rubberlike film by complexation of hydrogen-bond (H-bond)-donating poly(acrylic acid) (PAA) and H-bond-accepting poly(ethylene oxide) (PEO) (or poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (F108)). All HIPC elastomers prepared from varied PAA/PEO (or PAA/F108) ratios are healable elastomers with high extensibility (with the highest strain of 1400%). Recovery of all films can automatically occur or be accelerated by externally added water droplet. The stress- and strain healing efficiencies (η and η) of the water-assisting healed PAA/F108 blends are as high as 99%. Furthermore, stretchable and healable conductor films were fabricated from silver nanowire-printed (Ag-p) and the single-walled carbon nanotube-blended (SW-b) conductor films, respectively. The healable Ag-p conductor film is an ultrasensitive strain sensor, exhibiting large electric resistance variation when stretched. In contrast, the healable SW-b film is an ultrastable strain sensor with reversible resistance strain response over 200 stretching release cycles within a high strain range of 500%. Therefore, this study provides a new and flexible HIPC strategy for the fabrication of stretchable, ultrasensitive, and stable self-healing electrode materials.
人们对开发可拉伸应变传感器的兴趣与日俱增，这类传感器可用于量化与多种物种活动相关的大机械变形和应变。在此，我们通过氢键供体聚丙烯酸（PAA）与氢键受体聚环氧乙烷（PEO）（或聚环氧乙烷 - 聚环氧丙烷 - 聚环氧乙烷（F108））的络合作用，构建了弹性、可自愈的氢键聚合物间络合物（HIPC）橡胶状薄膜。由不同PAA/PEO（或PAA/F108）比例制备的所有HIPC弹性体都是具有高延展性的可自愈弹性体（最高应变达1400%）。所有薄膜的恢复可自动发生，或通过外部添加水滴加速。水辅助愈合的PAA/F108共混物的应力和应变愈合效率（η和η）高达99%。此外，分别由银纳米线印刷（Ag-p）和单壁碳纳米管共混（SW-b）导体膜制备了可拉伸且可自愈的导体膜。可自愈的Ag-p导体膜是一种超灵敏应变传感器，拉伸时表现出大的电阻变化。相比之下，可自愈的SW-b膜是一种超稳定应变传感器，在500%的高应变范围内经过200次拉伸 - 释放循环具有可逆的电阻应变响应。因此，本研究为制备可拉伸、超灵敏和稳定的自愈合电极材料提供了一种新的灵活的HIPC策略。
