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A Highly Efficient Self‐Healing Elastomer with Unprecedented Mechanical Properties
Author(s) -
Zhang Luzhi,
Liu Zenghe,
Wu Xueli,
Guan Qingbao,
Chen Shuo,
Sun Lijie,
Guo Yifan,
Wang Shuliang,
Song Jianchun,
Jeffries Eric Meade,
He Chuanglong,
Qing FengLing,
Bao Xiaoguang,
You Zhengwei
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201901402
Subject(s) - materials science , elastomer , self healing , ultimate tensile strength , toughness , composite material , stretchable electronics , polyurethane , electronics , electrical engineering , medicine , alternative medicine , pathology , engineering
Abstract It is highly desirable, although very challenging, to develop self‐healable materials exhibiting both high efficiency in self‐healing and excellent mechanical properties at ambient conditions. Herein, a novel Cu(II)–dimethylglyoxime–urethane‐complex‐based polyurethane elastomer (Cu–DOU–CPU) with synergetic triple dynamic bonds is developed. Cu–DOU–CPU demonstrates the highest reported mechanical performance for self‐healing elastomers at room temperature, with a tensile strength and toughness up to 14.8 MPa and 87.0 MJ m −3 , respectively. Meanwhile, the Cu–DOU–CPU spontaneously self‐heals at room temperature with an instant recovered tensile strength of 1.84 MPa and a continuously increased strength up to 13.8 MPa, surpassing the original strength of all other counterparts. Density functional theory calculations reveal that the coordination of Cu(II) plays a critical role in accelerating the reversible dissociation of dimethylglyoxime–urethane, which is important to the excellent performance of the self‐healing elastomer. Application of this technology is demonstrated by a self‐healable and stretchable circuit constructed from Cu–DOU–CPU.