| 초록 |
Sulfonated styrenic pentablock (SSPB) copolymer/sulfonated montmorillonite (s-MMT)/ionic liquid (IL) membranes were engaged as polyelectrolytes of ionic polymer-metal composite (IPMC) actuator. The SSPB-based IPMC actuators exhibited larger air-operable bending displacements, higher displacement rates and energy efficiency of actuations than the Nafion counterpart. The remarkably high performance of the SSPB/s-MMT/IL IPMCs was considered to be due to the microphase-separated large ionic domains of the SSPB (ca. 20 nm), the role of s-MMT as an ionic bridge between the ionic domains, the ion pumping effect of the bulky imidazolium cations of the ILs, and the loose ionic interaction between the anion and cation of IL as well. The microphase-separated nanostructure of the IPMC caused a high dimensional stability upon swelling in the presence of ILs, which effectively preserved the original electrode resistance against swelling, leading to a high actuation performance. |
