Effect of Imidazolium Monomer Structure on Properties of Imidazolium‐Functionalized Self‐Healing UV‐Cured Polymers for Flexible Electronic Devices. Issue 23 (23rd October 2019)

• Record Type: Journal Article
• Authors: Han, Jiwei; Gong, Haoran; Jiang, Shengling; Gao, Yanjing; Nie, Jun; Sun, Fang
• Is Part Of: Macromolecular chemistry and physics. Volume 220:Issue 23(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-10-23
• Subjects: imidazolium -- ionic interactions -- self‐healing -- UV‐curing; Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201900362
• Languages: English
• ISSNs: 1022-1352

Abstract

Abstract: Self‐healing UV‐cured polymeric materials based on ionic interactions possess many distinct advantages such as reliability, long lifetime, and green preparation process, and thus obtain great potential development. In this work, a series of UV‐curable imidazolium monomers with different structures are designed and synthesized, and then imidazolium ionic interaction‐based self‐healing materials are prepared through fast and eco‐friendly UV‐curing technology. Also, the structures of imidazolium monomers on properties of self‐healing UV‐cured polymers are investigated. The results show that the structures of imidazolium monomers have no obvious influences on photopolymerization properties of the polymers. The hydroxyl group and polar ether chains in imidazolium monomers can increase the glass transition temperature ( T g ) of the polymers. The large substituent at 1‐position of the imidazole ring enhances tensile strain of the polymers due to the reduction of the intermolecular force. The intermolecular forces and content of imidazole ionic groups all affect self‐healing efficiency of the polymers. The polymer containing HD‐IM‐E with a long and nonpolar pendent side chains exhibits an excellent self‐healing efficiency (>90%) and can be healed repeatedly. Importantly, the self‐healing polymer can also be used as a flexible electronic substrate to fabricate a flexible electronic device with good self‐healing function. Abstract : A series of UV‐curable self‐healing monomers (IM) containing imidazolium are designed and synthesized, then copolymerized with different UV‐curable monomers under UV irradiation to prepare self‐healing materials. The effects of imidazolium monomer structures on photopolymerization, and thermodynamic, mechanical and self‐healing properties of UV‐cured materials are studied. Furthermore, the UV‐cured self‐healing material can be used as a substrate for flexible electronic devices.