Morphology of Anion-Conducting Ionenes Investigated by X-ray Scattering and Simulation

Peer reviewed: 
Yes, item is peer reviewed.
Scholarly level: 
Faculty/Staff
Final version published as: 

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

Date created: 
2018-01-24
Identifier: 
DOI: 10.1021/acs.jpcb.7b10177
Abstract: 

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.

Language: 
English
Document type: 
Article
Rights: 
Rights remain with the authors.
Sponsor(s): 
Natural Sciences and Engineering Research Council of Canada (NSERC)
WestGrid
Compute Canada Calcul Canada
Statistics: