Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 20, Issue 42, Pages 9456-9462Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c000033g
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A sol-gel synthesis using modified poly(methyl methacrylate) (PMMA) bearing trimethoxysilane groups and tetraethoxysilane (TEOS) allowed immobilization of very high loadings of ionic liquid [BMIm][NTf2] within nanocomposite PMMA-silica membranes. The ionic liquid (IL) provided both flexibility and ionic conductivity, while the silica nanofiller covalently bonded to the polymer chains maintained mechanical strength, as shown by a DMA and tensile test. Complex impedance spectroscopy evidenced a critical threshold in ionic conductivity around 76%, which was ascribed to an unusual transition from polymer-in-salt to quasi-liquid electrolyte behaviour. Outstanding IL loadings as high as 90 wt% were reached, resulting in the same ionic conductivity as the pure IL.
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