Studies on thermal properties of selected aprotic and protic ionic liquids

Huimin Luo; Jing Fang Huang; Sheng Dai

doi:10.1080/01496390802151922

Studies on thermal properties of selected aprotic and protic ionic liquids

Huimin Luo, Jing Fang Huang, Sheng Dai

Oak Ridge National Laboratory

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

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	https://doi.org/10.1080/01496390802151922
State	Published - Jul 2008

Keywords

Ionic liquids
TGA/DSCs
Thermal properties

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10.1080/01496390802151922

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T1 - Studies on thermal properties of selected aprotic and protic ionic liquids

AU - Luo, Huimin

AU - Huang, Jing Fang

AU - Dai, Sheng

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N2 - 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.

AB - 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.

KW - Ionic liquids

KW - TGA/DSCs

KW - Thermal properties

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JO - Separation Science and Technology (Philadelphia)

JF - Separation Science and Technology (Philadelphia)

IS - 9-10

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Studies on thermal properties of selected aprotic and protic ionic liquids

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Keywords

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