Autonomous Self-Healing, Antifreezing, and Transparent Conductive Elastomers

作者：Li, Ren'ai; Fan, Ting; Chen, Guangxue; Zhang, Kaili; Su, Bin^*; Tian, Junfei; He, Minghui^*

来源：Chemistry of Materials, 2020, 32(2): 874-881.

DOI：10.1021/acs.chemmater.9b04592

• DEEP-EUTECTIC SOLVENTS
• HYDROGEL
• ORGANOHYDROGELS
• WATER

It is a challenge to synthesize all-in-one molecular networks that are autonomously self-healable over a wide temperature range (from subzero to high), transparent, stretchable, and conductive. Here we demonstrate the fabrication of self-healing, transparent, conductive, and highly stretchable elastomers by a photoinitiated copolymerization of two polymerizable deep eutectic solvent (PDES) monomers, acrylic amide (AAm)/choline chloride (ChCl) and maleic acid (MA)/ChCl type PDESs. Hydrogen bonds between binary building blocks of the poly(AAm/ChCl-co-MA/ChCl) system can readily break and reform, allowing such all organic designed elastomers to self-heal over a wide temperature ranging from -23 to 60 degrees C while keep a highly transparent appearance. The hypermolecular network elastomers showed a fast self-healing property (within 2 s) without any other external stimuli and excellent self-healing efficiency (up to 94%). The elastomers were highly transparent (an average transmittance of 95.1%), intrinsically conductive (an ionic conductivity of 4.0 x 10(-4) S cm(-1)), and stretchable (strains up to 450%) at room temperature. We hypothesize that this behavior will find their potential use in display and/or optically related fields of stretchable electronics in harsh environments.

• 单位
  华中科技大学