Author: Schibli, Eric M.
Author: Wright, Andrew G.
Author: Holdcroft, Steven
Author: Frisken, Barbara J.
We have studied the morphology of a novel series of benzimidazole-based ionenes, methylated poly(hexamethyl-p-terphenylbenzimidazolium) (HMT-PMBI), in halide form. Materials with anion-exchange capacities ranging from 0 to 2.5 mequiv/g were studied. X-ray scattering reveals three length scales in the materials: ion–polymer spacing (4 Å), polymer–polymer interchain spacing (6 Å), and an intrachain repeat distance (20 Å). No long-range structure is apparent above the monomer length, which is rare in ion-conducting polymer membranes. In preliminary molecular dynamics simulations, water molecules were observed forming chains between ions, even at a modest level of hydration, providing an interpenetrating network where conductivity can occur.
Eric M. Schibli, Andrew G. Wright, Steven Holdcroft, and Barbara J. Frisken. Morphology of Anion-Conducting Ionenes Investigated by X-ray Scattering and Simulation The Journal of Physical Chemistry B 2018 122 (5), 1730-1737. DOI: 10.1021/acs.jpcb.7b10177 https://pubs.acs.org/doi/abs/10.1021/acs.jpcb.7b10177
The Journal of Physical Chemistry
Morphology of Anion-Conducting Ionenes Investigated by X-ray Scattering and Simulation
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Funder: Compute Canada