Abstract
We describe herein the thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) investigations of the thermal properties of selected room-temperature ionic liquids (RTILs). The dependence of the thermal properties on both cation and anion structures of RTILs was systematically studied. The ionic liquids (ILs) investigated here include 28 different imidazolium-based ILs, 22 ammonium-based ILs, and 16 amide-based ILs. In general, these three cation classes exhibit different thermal behaviors but follow a quite systematic trend as expected from the corresponding structural variation. The ILs with bromide as the conjugate anion have lower thermal stabilities than those with bis(trifluoromethane sulfonyl) imide or bis(perfluoroethyl sulfonyl) imide as the conjugate anion. The mass of TGA samples and scan rate were found to have a systematic effect on the decomposition temperature of ILs, highlighting the caution needed in reporting TGA results.
| Original language | English |
|---|---|
| Pages (from-to) | 2473-2488 |
| Number of pages | 16 |
| Journal | Separation Science and Technology (Philadelphia) |
| Volume | 43 |
| Issue number | 9-10 |
| DOIs | |
| State | Published - Jul 2008 |
Funding
This research was supported by the Environmental Management Science Program of the Office of Science and Environmental Management, U.S. Department of Energy, under Contract DE-AC05–0096OR22725 with Oak Ridge National Laboratory, managed by UT-Battelle, LLC. Sheng Dai would like to thank Basic Energy Sciences, U.S. Department of Energy, under Contract DE-AC05–0096OR22725 with Oak Ridge National Laboratory for financial support.
| Funders | Funder number |
|---|---|
| Office of Science and Environmental Management | |
| U.S. Department of Energy | DE-AC05–0096OR22725 |
| Basic Energy Sciences | |
| Oak Ridge National Laboratory | |
| UT-Battelle |
Keywords
- Ionic liquids
- TGA/DSCs
- Thermal properties