Stretchable Hydrogels with Low Hysteresis and High Fracture Toughness for Flexible Electronics. Issue 4 (17th January 2022)

• Record Type: Journal Article
• Authors: Guo, Xiwei; Li, Jie; Wang, Jiaxin; Huang, Lingqi; Cheng, Guijuan; Zhang, Qi; Zhu, He; Zhang, Mingyue; Zhu, Shiping
• Is Part Of: Macromolecular rapid communications. Volume 43:Issue 4(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-17
• Subjects: anti‐fatigue -- high fracture toughness -- hydrogels -- low hysteresis -- sensors; Macromolecules -- Periodicals; Polymers -- Periodicals; Chemistry -- Periodicals; 547.705
• DOI: 10.1002/marc.202100716
• Languages: English
• ISSNs: 1022-1336

Abstract

Abstract: Stretchable materials, especially hydrogels, are emerging in various fields recently. Many applications demand low hysteresis and high fracture toughness of the materials to be used under dynamic mechanical loads. Herein, the authors report a hydrogel with high fracture toughness and low hysteresis through using a strong metal coordination bond and relatively high crosslinking density. This design allows the sacrificial bond to remain intact under normal operation, while fracturing to dissipate mechanical energy in the fracture zone to prevent propagation of the cracks. The obtained hydrogel exhibits a low hysteresis (≈1.5%) and a high fracture toughness (≈2, 164 J m −2 ). Moreover, the hydrogel possesses a high fatigue threshold of ≈141 J m −2 and a reasonable conductivity. This study provides a worth‐adopted approach to synthesize hydrogels with low hysteresis and high fracture toughness. Abstract : A stretchable hydrogel with low mechanical hysteresis and high fracture toughness shows great potential for wearable electronics applications.