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Ionic Conductivity of Cross-linked Polymethacrylate Derivatives/Cyclophosphazenes/Li+ Salt Complexes

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The role of cyclophosphazenes with oxyethylene chains (N3P3(OCH2CH2)nOCH3, (n = 3, 3, n = 7.2, 4) and N4P4[OC6H4O(CH2CH2O)7.2CH3]8 (8) for the synthesis and ionic conductivity in polymethacrylate networks was studied. Reflecting the structural features of cyclophosphazenes, the 7Li NMR spectra of the mixture of 3 and LiN(SO2CF3)2 showed that more than 40% of the Li+ salt could exist as a free ion at room temperature. Similar values were obtained for 4 and 8. Cross-linked methacrylate polymers (12–14, and 16–18) were prepared from the reaction of poly(ethylene glycol) methyl ether methacrylate and poly(ethylene glycol) dimethacrylate both in the presence of these cyclophosphazenes which act as molecular imprinting molecules (method II, M-II) and without the cyclophosphazene (method I) DSC studies of the imprinted polymer, 12(20)/3/Li+ system after removal of the cyclophosphazene showed that the glass transition temperature range (ΔTg) becomes significantly narrower compared to that of the unimprinted 11(20)/3/Li+ system, where cross-linked polymer 11(20) was prepared in the absence of the cyclophosphazenes (method I, M-I). The ionic conductivity of the Li+/cross-linked polymer system was improved by the subsequent readdition of the cyclophosphazenes. The 12(20)/3/Li+ complex showed a conductivity of 1.1 × 10−3 S/cm at 90 °C, which was two times higher than that of the 11(20)/3/Li+ complex. The effectiveness of the small molecule imprinting technique for the preparation of cross-linked polyelectrolytes with high conductivity and mechanical stability is discussed.

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Authors and Affiliations

  1. Department of Material Science and Biotechnology, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, 790-8577, Japan

    Kenzo Inoue, Tatsuya Yamauchi, Tomomichi Itoh & Eiji Ihara

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  1. Kenzo Inoue
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  2. Tatsuya Yamauchi
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  3. Tomomichi Itoh
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  4. Eiji Ihara
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Correspondence to Kenzo Inoue.

Additional information

We dedicate this paper to Professor Christopher W. Allen for his creative, pioneering work in inorganic ring and inorganic-organic hybrid polymers.

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Inoue, K., Yamauchi, T., Itoh, T. et al. Ionic Conductivity of Cross-linked Polymethacrylate Derivatives/Cyclophosphazenes/Li+ Salt Complexes. J Inorg Organomet Polym 17, 367–375 (2007). https://doi.org/10.1007/s10904-007-9126-3

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