Dielectric properties and kinetic analysis of nonisothermal decomposition of ionic liquids derived from organic acid
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AuthorsJanković, Bojan Ž.
Manić, Nebojša G.
Pereiro, Ana B.
Article (Published version)
© 2018 Elsevier B.V.
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Dielectric relaxation spectra of three representatives of the class of hydroxyethylammonium carboxylate protic ionic liquids (PILs), namely 2-hydroxyethylammonium formate [2-HEAF], 2-hydroxyethylammonium propionate [2-HEAP] and 2-hydroxyethylammonium butanoate [2-HEAB], were recorded over a wide frequency range (0.05 ≤ ν(GHz) ≤ 50) at 25 °C. The thermal decomposition kinetics of these ionic liquids derived from organic acids was studied by thermogravimetry (TG) using nonisothermal experiments. For the purpose of kinetic analysis, the thermal behavior of the samples was studied in the temperature interval from ambient temperature up to 420 °C at different heating rates (5, 10, 15 and 20 °C min−1). Isoconversional kinetic analysis was performed using Friedman's (FR) differential method and the integral Kissinger–Akahira–Sunose (KAS) method. The dependence of the apparent activation energy (E) on the conversion fraction (α) for the investigated decomposition processes was analyzed. It was... found that the molecular structure of the involved anion significantly influences the dielectric properties of the studied PILs. It was also established that a change in the anion structure drastically affects the shape of the thermo-analytical curves. Among the considered PILs [2-HEAF] has the highest thermal stability. However, considering kinetic properties, certain deviations were observed and referred to hydrogen bonding development and steric impediment effects. © 2018 Elsevier B.V.
Keywords:Anion chain length / Dielectric spectroscopy / Ionic liquids / Isoconversional analysis / Steric impediment / Thermal stability
Source:Thermochimica Acta, 2019, 672, 43-52
- Pollution Reduction from Thermal Power Plants of the Public Enterprise “Electric Power Industry of Serbia” (RS-42010)
- Dynamics of nonlinear physicochemical and biochemical systems with modeling and predicting of their behavior under nonequilibrium conditions (RS-172015)
- FCT/MCTES (Portugal) (FCT 2014 (IF/00190/2014))
- Associate Laboratory for Green Chemistry LAQV - FCT/MEC (UID/QUI/50006/2013)
- European Regional Development Fund under the PT2020 Partnership Agreement (POCI-01-0145-FEDER-007265)
- University of Pamplona - Internal Project 2-2017