d-Poly(e-caprolactone) (530)/siloxane biohybrid films doped with protic ionic liquids
authors Fernandes, M; Cardoso, MA; Rodrigues, LC; Silva, MM; Ferreira, RAS; Carlos, LD; Nunes, SC; Bermudez, VD
nationality International
journal JOURNAL OF ELECTROANALYTICAL CHEMISTRY
author keywords Poly(e-caprolactone)/siloxane hybrid; N-Ethylimidazolium trifluoromethanesulfonate; N-Butylimidazolium trifluoromethanesulfonate; Structure; Morphology; Ionic conductivity
keywords BRONSTED ACID-BASE; FUEL-CELL ELECTROLYTES; ELECTROCHROMIC DEVICES; MEMBRANES; COMPLEXES
abstract Organic/inorganic biohybrids composed of poly(e-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-P1L(x), 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 degrees C. The highest ionic conductivity value (4.3 x 10(-5) S cm(-1)) was measured for H-[Elm] [TfO] (16.4) at 105 degrees 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.
publisher ELSEVIER SCIENCE SA
issn 1572-6657
isbn 1873-2569
year published 2017
volume 799
beginning page 249
ending page 256
digital object identifier (doi) 10.1016/j.jelechem.2017.06.009
web of science category Chemistry, Analytical; Electrochemistry
subject category Chemistry; Electrochemistry
unique article identifier WOS:000411847300031

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