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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.

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Title Ion conduction and phase morphology in sulfonate copolymer ionomers based on ionic liquid–sodium cation mixtures
Author(s) Noor, Siti Aminah Mohd
Gunzelmann, Daniel
Sun, Jiazeng
MacFarlane, Douglas R.
Forsyth, Maria
Journal name Journal of materials chemistry A
Volume number 2
Issue number 2
Start page 365
End page 374
Total pages 10
Publisher Royal Society of Chemistry
Place of publication London, Eng.
Publication date 2014
ISSN 2050-7496
Summary 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.
Language eng
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2014, Royal Society of Chemistry
Persistent URL http://hdl.handle.net/10536/DRO/DU:30064314

Document type: Journal Article
Collections: Institute for Frontier Materials
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.