Studies on thermal properties of selected aprotic and protic ionic liquids

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Separation Science and Technology

DOI:https://doi.org/10.1080/01496390802151922· OSTI ID:1036600

Luo, Huimin ^[1]; Dai, Sheng ^[1]; Huang, Jing-Fang ^[1]

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1. ORNL

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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1036600
• Journal Information: Separation Science and Technology, Vol. 43, Issue 9-10; ISSN 0149-6395
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANIONS
BROMIDES
CALORIMETRY
CATIONS
IMIDES
MOLTEN SALTS
THERMAL GRAVIMETRIC ANALYSIS
THERMODYNAMIC PROPERTIES
Ionic liquids
thermal properties
TGA/DSC