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Ionic polymer actuator based on anion-conducting methylated ether-linked polybenzimidazole

Title
Ionic polymer actuator based on anion-conducting methylated ether-linked polybenzimidazole
Author
강영종
Keywords
Anion-conducting membrane; Ether-linked polybenzimidazole; PBI-OO; Ionic polymer actuator
Issue Date
2015-05
Publisher
ELSEVIER SCIENCE SA
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v. 214, Page. 43-49
Abstract
A new type of ionic polymer actuator based on anion-conducting methylated poly[(1-(4,4'diphenylether)-5-oxybenzimidazole)-benzimidazole] (PBI-OO) membranes and a carbon composite electrode material was successfully developed. The anion-conducting membrane was prepared through N-methylation of PBI-OO with iodomethane. The ion exchange reaction of the methylated PBI-OO membrane to various anions largely affected the ion conductivity and the resulting actuator performance. The methylated PBI-OO membranes possessed unique small ion clusters with the size of 1.71-2.04 nm and exhibited high tensile moduli and strengths in the hydrated states (tensile modulus: 553 MPa, tensile strength: 32 MPa in the iodide form) due to the pi-pi stacking interaction among the benzimidazole rings in the polymer backbone. The actuators based on PBI-OO bent toward the negatively charged electrode direction reverse to the bending direction of conventional ionic polymer actuators with cation-conducting membranes. They also revealed exceptional charge-specific blocking forces (at least 17 times larger than those of Nafion-based actuators) because of a combinatorial effect of the larger modulus of PBI-OObased actuators and the smaller size of ion clusters inside the PBI-OO layer, and the electrolysis of water restrained using a carbon electrode as well. Moreover, the actuators showed no back relaxation within the examined time period even under a high dc voltage beyond the electrolysis voltage of water. The distinct characteristics of the PBI-OO-based actuators are expected to be used as a unique anion-conducting polymer actuator. (C) 2015 Published by Elsevier B.V.
URI
http://www.sciencedirect.com/science/article/pii/S0925400515003275http://hdl.handle.net/20.500.11754/24450
ISSN
0925-4005
DOI
10.1016/j.snb.2015.03.007
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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