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Titled-Poly(e-caprolactone) (530)/siloxane biohybrid films doped with protic ionic liquids
Author(s)Fernandes, M.
Cardoso, M. A.
Rodrigues, L. C.
Silva, Maria Manuela
Ferreira, R. A. S.
Carlos, L. D.
Nunes, S. C.
de Zea Bermudez, V.
KeywordsPoly(ε-caprolactone)/siloxane hybrid
N-Ethylimidazolium trifluoromethanesulfonate
N-Butylimidazolium trifluoromethanesulfonate
Ionic conductivity
Poly(e-caprolactone)/siloxane hybrid
Issue date2017
JournalJournal of Electroanalytical Chemistry
Abstract(s)Organic/inorganic biohybrids composed of poly(ε-caprolactone) (PCL(530)) (where 530 represents the average molecular weight of the chains in gmol−1 ) chains covalently bonded to a siloxane network via urethane linkages and incorporating protic ionic liquids (PILs) were investigated. The materials (H-PILX, where H represents the host hybrid matrix and X is the ratio, in %, of the mass of PIL per mass of organic precursor) were doped with two different concentrations of N-ethylimidazolium trifluoromethanesulfonate ([EIm][TfO]) and N-butylimidazolium trifluoromethanesulfonate ([BIm][TfO]). The samples were processed as essentially amorphous and transparent films, thermally stable up to at least 200 °C. The highest ionic conductivity value (4.3 × 10−5 S cm−1 ) was measured for H-[EIm][TfO]16.4 at 105 °C. This work emphasizes that Scanning Electron Microscopy (SEM)/Energy Dispersive X-ray Spectroscopy (EDS) measurements are mandatory for the morphological characterization of IL-based electrolytes. In the case of the most concentrated [BIm][TfO]-doped hybrid studied this technique enabled the detection of segregated silica-rich circular micro-sized regions formed as a result of the hydrophobic interactions established between the bulky butyl chains of the [BIm]+ cation and the PCL(530) chains of the host matrix.
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