Epoxy resin crosslinked with conventional and deep eutectic ionic liquids (in English)
Polimery 2012, No 6, 456
Molecular ionic liquid, i.e. 1-ethyl-3-methylimidazolium chloride ([EMIM]Cl) and eutectic mixture of imidazole with choline chloride (IM + ChCl) have been used as epoxy resin hardeners. An influence of [EMIM]Cl and IM + ChCl content on pot life of epoxy compositions and runs of crosslinking process has been evaluated using DSC and ARES rheometry techniques. Epoxy compositions with [EMIM]Cl showed latent properties (pot life up to 50 days) while the systems with IM + ChCl gelled after few days. Comparative measurement of thermomechanical (Tg, tan d) and mechanical properties (tensile, flexural and shear strength on aluminum substrates) as well as thermal decomposition of epoxy composites have been performed. Composite epoxy materials crosslinked with [EMIM]Cl exhibited more elastic properties (lower Tg and higher tan d values) and generally better mechanical features than those hardened with imidazole + choline chloride eutectic mixture.