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왕혁식,조재현,박혜원,조재영,박종혁 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.96 No.-
Ionic liquids (ILs) have been exploited as the internal solvent in the development of ionic polymer–metalcomposite (IPMC) actuators capable of long-term operation. However, a major issue is that most IPMCsimpregnated with conventional ILs are yet to be practically applied due to insufficient actuationperformance. Herein, methylammonium formate (MAF), an IL with low viscosity, small ionic size, highionic conductivity, and excellent electrochemical stability, is introduced as a new internal solvent forIPMCs to achieve both excellent operation characteristics and long-term stability. The actuationcharacteristics of a series of IPMCs impregnated with four types of ILs, including MAF, were analyzed. TheMAF-based IPMCs had more than twice the displacement and three-fold higher blocking forcescompared with other IL-based IPMCs. Moreover, unlike conventional water-driven IPMCs, the MAFdrivenIPMCs operated even at high voltages (4 V) without solvent loss and electrolysis. Their initialdisplacement remained above 81% even after operating for 2160 cycles (6 h). This simple change of mediain IPMC actuators is expected to advance the design of IPMCs with improved displacement, forcegeneration, and stability.