使用定量红外光谱法测量硫酸乙酯-1-乙基-3-甲基咪唑鎓的热分解动力学。

Thermal Breakdown Kinetics of 1-Ethyl-3-Methylimidazolium Ethylsulfate Measured Using Quantitative Infrared Spectroscopy.

作者信息

Wheeler Jeffrey L, Pugh McKinley, Atkins S Jake, Porter Jason M

机构信息

1 Department of Mechanical Engineering, Colorado School of Mines, Golden, CO, USA.

2 Department of Physics and Astronomy, Brigham Young University, Provo, UT, USA.

出版信息

Appl Spectrosc. 2017 Dec;71(12):2626-2631. doi: 10.1177/0003702817727293. Epub 2017 Sep 12.

DOI:10.1177/0003702817727293

PMID:28895753

Abstract

In this work, the thermal stability of the room temperature ionic liquid (RTIL) 1-ethyl-3-methylimidazolium ethylsulfate ([EMIM][EtSO]) is investigated using infrared (IR) spectroscopy. Quantitative IR absorption spectral data are measured for heated [EMIM][EtSO]. Spectra have been collected between 25 ℃ and 100 ℃ using a heated optical cell. Multiple samples and cell pathlengths are used to determine quantitative values for the molar absorptivity of [EMIM][EtSO]. These results are compared to previous computational models of the ion pair. These quantitative spectra are used to measure the rate of thermal decomposition of [EMIM][EtSO] at elevated temperatures. The spectroscopic measurements of the rate of decomposition show that thermogravimetric methods overestimate the thermal stability of [EMIM][EtSO].

摘要

在这项工作中，使用红外（IR）光谱法研究了室温离子液体（RTIL）1-乙基-3-甲基咪唑硫酸乙酯（[EMIM][EtSO]）的热稳定性。对加热后的[EMIM][EtSO]测量了定量红外吸收光谱数据。使用加热光学池在25℃至100℃之间收集光谱。使用多个样品和池光程来确定[EMIM][EtSO]摩尔吸光率的定量值。将这些结果与之前离子对的计算模型进行比较。这些定量光谱用于测量高温下[EMIM][EtSO]的热分解速率。分解速率的光谱测量表明，热重分析法高估了[EMIM][EtSO]的热稳定性。