Abstract
The 1-butyl-3-methylimidazolium halide ionic liquids are stable up to temperatures of 246(1)°C ([BMIm]Cl), 260(1)°C ([BMIm]Br), and 238(1)°C ([BMIm]I). The thermal decomposition proceeds in thermogravimetric measurements with a total mass loss of 100%. Using evolved gas analysis (EGA) a complete degradation of [BMIm]X ionic liquids under formation of characteristic fragments CH3+, NHn+, C4Hn+, and CH3X+ (X=Cl, Br, I) has been observed.[BMIm]Cl shows enantiotropic polymorphism with a phase transition temperature at 30(1)°C, and melts at 74(1)°C (ΔHfus=18±0.5kJmol−1). Spontaneous re-crystallization and reversible phase transition have been found for cooling of the substance.[BMIm]Br melts at 78(1)°C (ΔHfus=29±0.5kJmol−1). The re-crystallization fails and thus a glassy solid is formed. The glass transition temperature is about −65°C, the cold crystallization occurs between −30 and −20°C. The application of both homogeneous and heterogeneous nucleation agents does not interfere the glassy state.[BMIm]I undergo solidification without crystallization. The melting effect for the amorphous substance arise at −70(5)°C with ΔHfus=0.4±0.2kJmol−1.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
