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Styrenic block copolymer/sulfonated graphene oxide composite membranes for highly bendable ionic polymer actuators with large ion concentration gradient

In this study, sulfonated graphene oxide (sGO) with a large enhanced sulfonation degree of 1.65?mmol?g?1 was simultaneously introduced as a highly ion conduction-activating carbonaceous filler for ionic polymer–metal composite (IPMC) actuator. The nanostructured styrenic block copolymer/sGO/ionic liquid (IL) composite membrane actuators revealed much larger actuation performance than top-ranked polyelectrolyte/IL actuators ever reported so far in terms of bending strain (0.88% under 2?V dc), initial strain rate (0.312% min?1), and charge-specific displacement (276.4?mm?C?1). Moreover, SSPB/sGO/IL actuators exhibited excellent actuation performance without drawbacks of conventional IPMCs, such as back-relaxation and early loss of inner solvent. In addition, via tracking the movement of the IL's anion through energy-dispersive X-ray spectroscopy (EDS) analysis, not only the transporting behaviour of IL but also the pumping effect with solvated ion complexes inside the actuator are confirmed for the first time.

» Author: Jang-Woo Lee, Taehoon Kwon, Youngjong Kang, Tae Hee Han, Chang Gi Cho, Soon Man Hong, Suk-Won Hwang, Chong Min Koo

» Reference: Composites Science and Technology, Volume 163

» Publication Date: 28/07/2018

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This project has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n° [609203].

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