Room temperature readily self-healing polymer via rationally designing molecular chain and crosslinking bond for flexible electrical sensor

The polymer possesses room temperature rapid self-healing capability and high mechanical toughness synchronously. [Display omitted] Mechanically tough polymers with excellent room temperature self-healing capacity have aroused strong interest in soft electronics, electronic skins and flexible energy...

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Veröffentlicht in:Journal of colloid and interface science 2020-02, Vol.559, p.152-161
Hauptverfasser: Wu, Xianzhang, Wang, Jinqing, Huang, Jingxia, Yang, Shengrong
Format: Artikel
Sprache:eng
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Zusammenfassung:The polymer possesses room temperature rapid self-healing capability and high mechanical toughness synchronously. [Display omitted] Mechanically tough polymers with excellent room temperature self-healing capacity have aroused strong interest in soft electronics, electronic skins and flexible energy storage devices. However, achieving such polymers remains a challenge due to tardy diffusion dynamics. Herein, a robust and readily self-healing polymer, which is synthesized by one-pot polymerization among 2,4′-tolylene diisocyanate, isophorone diisocyanate, and poly(oxy-1,4-butanediyl), is achieved through reasonably tuning the hardness of the molecular segment and the strength of the dynamic crosslinking bond. The poly(oxy-1,4-butanediyl) that act as a soft segment can effectively avoid the microphase separation, enabling rapid chain mobility of the polymer at the room temperature. Furthermore, the dual H-bonding from 2,4′-tolylene diisocyanate segment acting as a relatively strong crosslinking bond contributes to high mechanical strength, while the weaker single H-bonding from isophorone diisocyanate segment can efficiently dissipate strain energy by bond rupture, endowing the polymer with rapid room temperature self-healing ability. Featuring state-of-the-art of robust stress strength (≈1.3 MPa), high self-healing efficiency (97% within 6 h), and large tensile strain (≈2100%), the resulting polymers are used for the fabrication of stretchable and self-healable electrical sensor, which can be employed to monitor a variety of physiological activities in real time. The described strategy is promising and universal for healable materials, displaying great potential for developing soft electronics.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2019.10.019