Ion conduction and phase morphology in sulfonate copolymer ionomers based on ionic liquid–sodium cation mixtures
Noor, Siti Aminah Mohd, Gunzelmann, Daniel, Sun, Jiazeng, MacFarlane, Douglas R. and Forsyth, Maria 2014, Ion conduction and phase morphology in sulfonate copolymer ionomers based on ionic liquid–sodium cation mixtures, Journal of materials chemistry A, vol. 2, no. 2, pp. 365-374, doi: 10.1039/C3TA13835F.
A series of sulfonate based copolymer ionomers based on a combination of ionic liquid and sodium cations have been prepared in different ratios. This system was designed to improve the ionic conductivity of ionomers by partially replacing sodium cations with bulky cations that are less associated with anion centres on the polymer backbone. This provides more conduction sites for sodium to ‘hop’ to in the ionomers. Characterization showed the glass transition and 15N chemical shift of the ionomers did not vary significantly as the amount of Na+ varied, while the ionic conductivity increased with decreasing Na+ content, indicating conductivity is increasingly decoupled from Tg. Optical microscope images showed phase separation in all compositions, which indicated the samples were inhomogeneous. The introduction of low molecular weight plasticizer (PEG) reduced the Tg and increased the ionic conductivity significantly. The inclusion of PEG also led to a more homogeneous material.
Field of Research
039999 Chemical Sciences not elsewhere classified
Socio Economic Objective
970103 Expanding Knowledge in the Chemical Sciences
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