A healable, mechanically robust and ultrastretchable ionic conductive elastomer for durably wearable sensor  

作　　者：Guoxian Zhang Chunmei Li JiaoJun Tan Mingqi Wang Yafeng Ren Feijie Ge Qiuyu Zhang 

机构地区：[1]Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology,School of Chemistry and Chemical Engineering,Northwestern Polytechnical University,Xi'an 710072,China [2]College of Bioresources Chemical and Materials Engineering,National Demonstration Center for Experimental Light Chemistry Engineering Education,Shaanxi University of Science&Technology,Xi’an 710021,China

出　　处：《Nano Research》2024年第4期3369-3378,共10页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22275148,52203144,and 22375162);the Key R&D Project of Shaanxi Province(Nos.2023-YBGY-489 and 2023-YBGY-474);the Central Government Guides Local Science and Technology Development Fund Projects(No.2022ZY2-JCYJ-01-07);the Natural Science Basic Research Plan in Shaanxi Province of China(No.2022-JQ136);the Fundamental Research Funds for the Central Universities(No.5000210717);the Foundation(No.2019KF04)of Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control,College of Light Industry and Food Engineering,Guangxi University for financial support.

摘　　要：The ionic conductive elastomers show great promise in multifunctional wearable electronics,but they currently suffer from liquid leakage/evaporation or mechanical compliance.Developing ionic conductive elastomers integrating non-volatility,mechanical robustness,superior ionic conductivity,and ultra-stretchability remains urgent and challenging.Here,we developed a healable,robust,and conductive elastomer via impregnating free ionic liquids(ILs)into the ILs-multigrafted poly(urethane-urea)(PUU)elastomer networks.A crucial strategy in the molecular design is that imidazolium cations are largely introduced by double-modification of PUU and centipede-like structures are obtained,which can lock the impregnated ILs through strong ionic interactions.In this system,the PUU matrix contributes outstanding mechanical properties,while the hydrogen bonds and ionic interactions endow the elastomer with self-healing ability,conductivity,as well as non-volatility and transparency.The fabricated ionic conductive elastomers show good conductivity(3.8×10^(-6) S·cm^(-1)),high mechanical properties,including tensile stress(4.64 MPa),elongation(1470%),and excellent healing ability(repairing efficiency of 90%after healing at room temperature for 12 h).Significantly,the conductive elastomers have excellent antifatigue properties,and demonstrate a highly reproducible response after 1000 uninterrupted extension-release cycles.This work provides a promising strategy to prepare ionic conductive elastomers with excellent mechanical properties and stable sensing capacity,and further promote the development of mechanically adaptable intelligent sensors.

关 键 词：ionic conductive elastomers poly(urethane-urea)(PUU) ionic interactions centipede-like SELF-HEALING 

分 类 号：O63[理学—高分子化学]