一种面向柔性离子电子学的超强韧、可拉伸的多功能离子凝胶

An ultra-tough and super-stretchable ionogel with multi functions towards flexible iontronics

离子凝胶由于良好的热稳定性、高离子传导性和非挥发性,近年来引起了广泛的关注.然而,大部分离子凝胶并不能同时具备良好的机械强度和拉伸性,因此其力学性能仍有待提高.本工作将相互作用较强的聚合物结晶和较弱的离子偶极相互作用结合起来,制备了一种超强韧且可拉伸的离子凝胶.该离子凝胶具有高韧性、高断裂强度、高杨氏模量和良好的拉伸性.此外,该离子凝胶还具有良好的抗疲劳性、快速的自恢复性、高透明度、可回收性、自修复能力、高离子传导性和宽电化学窗口等特性.同时,其在摩擦纳米发电机、离子热电材料和应变传感器等离子电子器件中具有较大的应用潜力.本工作通过可逆的强、弱相互作用,为高性能离子凝胶的制备提供了一种新的方法.

Ionogels have attracted much attention in recent years because of their good thermal stability,high ionic conductivity,and non-volatility.However,there is a trade-off between the mechanical strength and stretchability of ionogels,which results in unsatisfactory mechanical performance.Herein,strong polymer crystallization and weak ion-dipole interaction are combined to prepare an ultra-tough and superstretchable ionogel.The crystalline region can dissipate the energy through the stress-induced disaggregation mechanism in the stretching process and toughen the gel,while the reversible formation and dissociation of the ion-dipole interaction between amorphous polymer chains and ionic liquids can provide elasticity for large strain.These ionogels have high toughness,strong tensile strength,large Young’s modulus,and good stretchability.Furthermore,the ionogels also possess other properties like good fatigue resistance,quick selfrecovery,high transparency,recyclability,self-healing ability,high ionic conductivity,and wide electrochemical window.This ionogel exhibits great potential in several iontronic devices,such as triboelectric nanogenerators,ionic thermoelectric materials,and strain sensors.This study develops a new method to guide the preparation of high-performance ionogels by combining reversible strong and weak interactions.