Self-healable and recyclable polyurethane-polyaniline hydrogel toward flexible strain sensor

Published on Aug 15, 2021in Composites Part B-engineering7.635
· DOI :10.1016/J.COMPOSITESB.2021.108965
Yuanlai Fang7
Estimated H-index: 7
(Sichuan University),
Junhuai Xu2
Estimated H-index: 2
(Sichuan University)
+ 4 AuthorsHaibo Wang25
Estimated H-index: 25
(Sichuan University)
Source
Abstract
Abstract Flexible electronics have been extensively investigated in recent years because of their potential applications in artificial skin, soft robotics, energy storage, healthcare technology, etc. However, since the rigid and brittle nature of the conductive or semi-conductive materials, it's a huge challenge to project stretchable, self-healable and recyclable soft electronics to mimic skin. Herein, the interpenetrating and synergistic dual-network hydrogel of Diels-Alder chemistry-based dynamic polyurethane substrates and polyaniline conductive polymer (PU-DA-1/1-PANI) was prepared and employed as a strain sensor. The PU-DA-1/1-PANI hydrogel exhibited large elongation at break of 500%, soft Young's modulus of 0.3 MPa, and robust tensile strength of 1.1 MPa. Meanwhile, the strain sensors with optimized composition presented an ideal conductivity of 7.9 S m−1, which could monitor the physical motions precisely and repeatedly with a gauge factor (GF) of 2.9. In addition, the mechanical performance and conductivity could be self-healed, which was enabled by the hydrogen bonds, ionic interactions, reversible DA covalent bonds, and rearrangement of polymer chains. Built on the thermally stimuli-responsive nature of the DA covalent cross-linking points, the PU-DA-1/1-PANI composites could be recycled.
References66
Newest
#1Junchen LuoH-Index: 12
#2Shijie GaoH-Index: 3
Last. Jiefeng GaoH-Index: 33
view all 10 authors...
Abstract Smart textile devices have now received increasing attention for potential application in wearable human motion monitoring, healthcare and personal thermal management. MXene (Ti3C2Tx), which is a new two-dimensional material with remarkable properties, has been widely applied in wearable electronics. However, it remains a challenge to prepare MXene based smart textile that possesses multifunctional wearable sensing applications and can also keep MXene from oxidizing. Here, we fabricated...
10 CitationsSource
#1Shan Wang (ZJU: Zhejiang University)H-Index: 7
#2Yuanlai Fang (NUS: National University of Singapore)H-Index: 2
Last. Jianyong Ouyang (NUS: National University of Singapore)H-Index: 71
view all 6 authors...
10 CitationsSource
#1Yuanlai Fang (Sichuan University)H-Index: 2
#1Yuanlai Fang (Sichuan University)H-Index: 7
Last. Jianyong Ouyang (NUS: National University of Singapore)H-Index: 71
view all 9 authors...
7 CitationsSource
#1Liwei Lin (YZU: Yangzhou University)H-Index: 7
#2Ling Wang (YZU: Yangzhou University)H-Index: 18
Last. Jiefeng Gao (Sichuan University)H-Index: 33
view all 8 authors...
Abstract Conductive nanofiber composites (CNCs) are promising as wearable strain sensors (WSSs) due to their unique porous structure and thus good breathability, flexibility, skin affinity, and so forth. It still remains a great challenge to develop flexible and stretchable CNCs for high performance WSSs that possess a high sensitivity, large working strain and can also be applied in various harsh conditions such as extremely cold and corrosive environment. Here, we propose a facile strategy for...
23 CitationsSource
#1Huimin Wang (Ministry of Education)H-Index: 19
#2Haomin Wang (Ministry of Education)H-Index: 6
Last. Yingying Zhang (Ministry of Education)H-Index: 46
view all 12 authors...
Protective clothing plays a vital role in safety and security. Traditional protective clothing can protect human body from physical injure. It is highly desired if modern wearable electronics can be integrated into traditional protection suit to endow it with versatile smart functions. However, it is still challenging to integrate electronics into clothing through a practical approach while keeping the intrinsic flexibility and breathability of textiles. In this work, we realized the direct writ...
15 CitationsSource
#1Xia Sun (TJU: Tianjin University)H-Index: 8
#2Zhihui Qin (TJU: Tianjin University)H-Index: 12
Last. Fanglian Yao (ECJTU: East China Jiaotong University)H-Index: 31
view all 8 authors...
Abstract Flexible strain sensors have attracted much attention for their applications in human–machine interactions and personal health monitoring. However, fabricating strain sensors based on hydrogels with high stretchability and tensile strength simultaneously still remains a challenge due to the intrinsic brittleness of conventional hydrogel. In this study, a conductive nanocomposite hydrogel comprised of oxidized multi-walled carbon nanotubes (oxCNTs) and polyacrylamide (PAAm) is developed....
46 CitationsSource
#1Xiaoting Li (CityU: City University of Hong Kong)H-Index: 1
#2Keng Huat Koh (CityU: City University of Hong Kong)H-Index: 4
Last. King Wai Chiu Lai (CityU: City University of Hong Kong)H-Index: 25
view all 4 authors...
Waterproof fiber-based strain sensors with high gauge factor and outstanding stability are essential for smart textiles, wearable devices and biomedical electronics. In this work, we demonstrate a highly flexible, stretchable, sensitive, and waterproof core-sheath structure strain sensor with a relatively wide strain-sensing range fabricated by a simple approach. Such a core-sheath structure is composed of a superelastic core material polyurethane (PU) yarn; a highly conductive multilayer sheath...
11 CitationsSource
#1Yuanlai Fang (Sichuan University)H-Index: 7
#2Xiaosheng Du (Sichuan University)H-Index: 14
Last. Haibo Wang (Sichuan University)H-Index: 25
view all 6 authors...
Abstract Widely applied waterborne polyurethane (WPUs) are expected to be functionalized with excellent mechanical property, ideal self-healing performance and desired recyclability, but it is a great challenge to integrate these attractive properties into a one pot WPU platform. Herein, a novel double ingredients waterborne polyurethane (2K-WPU-DA-x), found on the furan modified WPU-F and maleimide decorated WPU-M dispersions for Diels-Alder (DA) cross-linking reactions, was designed and projec...
3 CitationsSource
#1Zahid Hanif (Korea University of Technology and Education)H-Index: 4
#2Daeyong Shin (Korea University of Technology and Education)H-Index: 1
Last. Sung Jea Park (Korea University of Technology and Education)H-Index: 10
view all 4 authors...
Abstract Vapor-phase polymerization (VPP) of polypyrrole (PPy) is a versatile and simple form of surface restraint polymerization onto a variety of substrates; only the polymerization initiator (an oxidant) is adsorbed onto the surface. However, traditional VPP features substrate (film, foam and fabric) impregnation/coating with an oxidant, followed by short drying to evaporate excess solvent, and then pyrrole polymerization onto the oxidant coated surface with controlled relative humidity. When...
8 CitationsSource
#1Bei Li (YZU: Yangzhou University)H-Index: 12
#2Junchen Luo (YZU: Yangzhou University)H-Index: 12
Last. Yiu-Wing Mai (USYD: University of Sydney)H-Index: 115
view all 10 authors...
Abstract Much attention has been given to flexible electronic devices in recent years. Conductive polymer composites (CPCs) have been utilized to fabricate strain sensors owing to their lightweight and high flexibility. It is a great challenge to develop flexible and wearable strain sensors with light weight, good skin affinity and gas permeability, high sensitivity and excellent corrosion resistance. In this work, electrospun thermoplastic polyurethane (TPU) nanofibers were first decorated by g...
40 CitationsSource
Cited By0
Newest