Dielectric properties and kinetic analysis of nonisothermal decomposition of ionic liquids derived from organic acid

摘要: Abstract Dielectric relaxation spectra of three representatives the class hydroxyethylammonium carboxylate protic ionic liquids (PILs), namely 2-hydroxyethylammonium formate [2-HEAF], propionate [2-HEAP] and butanoate [2-HEAB], were recorded over a wide frequency range (0.05 ≤ ν(GHz) 50) at 25 °C. The thermal decomposition kinetics these derived from organic acids was studied by thermogravimetry (TG) using nonisothermal experiments. For purpose kinetic analysis, behavior samples in temperature interval ambient up to 420 °C different heating rates (5, 10, 15 20 °C min−1). Isoconversional analysis performed Friedman’s (FR) differential method integral Kissinger–Akahira–Sunose (KAS) method. dependence apparent activation energy (E) on conversion fraction (α) for investigated processes analyzed. It found that molecular structure involved anion significantly influences dielectric properties PILs. also established change drastically affects shape thermo-analytical curves. Among considered PILs [2-HEAF] has highest stability. However, considering properties, certain deviations observed referred hydrogen bonding development steric impediment effects.