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Thermal Stability of Protic Ionic Liquids.

Stefan Paporakis1, Kenny T-C Liu1, Stuart J Brown1

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|April 22, 2024
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Summary

Six protic ionic liquids (ILs) showed good thermal stability when heated in sealed conditions. However, prolonged heating in open conditions led to significant changes in these ILs, impacting their properties.

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Area of Science:

  • Chemistry
  • Materials Science

Background:

  • Protic ionic liquids (ILs) are versatile solvents with growing applications.
  • Limited data exists on the long-term thermal degradation of protic ILs at elevated temperatures.

Purpose of the Study:

  • To investigate the thermal stability of six common protic ionic liquids.
  • To evaluate the impact of prolonged heating (1 hour vs. 1 week) at 60°C on IL properties under sealed and open conditions.

Main Methods:

  • Differential scanning calorimetry (DSC) for thermal phase transitions.
  • Proton nuclear magnetic resonance (¹H NMR) spectroscopy for molecular structure.
  • Monitoring changes in water content, pH, and mass.

Main Results:

  • Sealed heating resulted in minor shifts in water content and pH, with no significant changes in mass, thermal transitions, or molecular structure.
  • Open heating for 1 hour showed no significant changes.
  • Open heating for 1 week caused significant degradation and property changes in the protic ILs.

Conclusions:

  • Protic ionic liquids exhibit good thermal stability under sealed conditions at 60°C.
  • Exposure to ambient atmosphere during prolonged heating accelerates the degradation of protic ionic liquids.
  • Understanding these degradation pathways is crucial for optimizing IL applications and storage.