PEO oligomers having sulfonamide groups or ethylimidazolium groups on the chain ends were prepared, and they were mixed to form molten salts at the terminal of these PEO derivatives. For the PEO having sulfonamide groups, it glass transition temperature decreased from 3.2 °C to −61.6 °C and ionic conductivity increased about 105 times after mixing with PEO having ethylimidazolium groups. The formation of molten salts at the terminal of PEO chains is effective for the design of fast ion transfer matrix.
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Ohno et al. (1998) studied this question.