| 초록 |
Herein, we demonstrate that the membranes composed of a nanostructured styrenic pentablock copolymer (SSPB) and a sulfonated graphene oxide (sGO), incorporating an imidazolium IL, act as novel IPMC polymer electrolytes. Our actuator reveals a much superior actuation performance to existing ionic polymer actuators in terms of displacement, rate, and energy efficiency, without drawbacks of conventional IPMCs. The enhanced performance is intimately related to the large ionic domains (ca. 22 nm) in the nanostructured SSPB polyelectrolyte and the strong interactions between the mobile IL’s ions and the sulfonic groups on the sGO inside the SSPB, which lead to a fast and efficient transport of bulky IL’s ions. By tracking the movement of the IL’s anion through energy-dispersive X-ray spectroscopy, the excellent actuation of IL-impregnated SSPB IPMCs is caused by a steep concentration gradient of associated IL as well as the dissociated ions along the thickness direction of the SSPB layer. |
