Improved ionic conductivity of nitrile rubber/ionic liquid composites |
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Authors: | Edy Marwanta |
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Affiliation: | Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan |
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Abstract: | Polymer electrolytes with high ionic conductivity and good elasticity were prepared by mixing nitrile rubber (poly(acrylonitrile-co-butadiene) rubber; NBR) with ionic liquid, N-ethylimidazolium bis(trifluoromethanesulfonyl)imide (EImTFSI). The NBR/EImTFSI composites were obtained as homogeneous and transparent films when the ionic liquid content was less than 60 wt%. Raman spectroscopy suggested the interaction between nitrile group of NBR and TFSI anion. Sample with ionic liquid content of 50 wt% showed the ionic conductivity of 1.2×10−5 S cm−1 at 30 °C. Addition of lithium salt to this NBR/EImTFSI composite further enhanced the ionic conductivity to about 10−4 S cm−1 without spoiling mechanical properties. DSC studies showed two glass transition temperatures for composites indicating microphase separation. |
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Keywords: | Nitrile rubber Ionic liquid Ionic conductivity |
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