期刊
MATERIALS
卷 15, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/ma15031247
关键词
ionic liquids; monocationic; dicationic; thermal kinetic; activation energy
类别
资金
- Yayasan Universiti Teknologi PETRONAS (YUTP) [015LC-049]
This work presents an in-depth kinetic thermal degradation comparison between traditional monocationic and the newly developed dicationic ionic liquid (IL), both coupled with a bromide (Br-) anion by using non-isothermal thermogravimetric analysis. Thermal analyses of 1-butyl-1-methylpyrrolidinium bromide [C(4)MPyr][Br] and 1,4-bis(1-methylpyrrolidinium-1-yl)butane dibromide [BisC(4)MPyr][Br-2] were conducted at a temperature range of 50-650 degrees C and subjected to various heating rates, which are 5, 10, 15, 20 and 25 degrees C/min. Thermogravimetric analysis revealed that dicationic IL, [BisC(4)MPyr][Br-2] is less thermally stable compared to monocationic [C(4)MPyr][Br]. A detailed analysis of kinetic parameters, which are the activation energy (E-a) and pre-exponential factor (log A), was calculated by using Kissinger-Akahira-Sunose (KAS), Flynn-Wall-Ozawa (FWO) and Starink. This study revealed that the average E-a and log A of [BisC(4)MPyr][Br-2] are lower than [C(4)MPyr][Br], which may be contributed to by its low thermal stability. Conclusively, it proved that the E-a and log A of ILs are strongly related to the thermal stability of ILs.
This work presents an in-depth kinetic thermal degradation comparison between traditional monocationic and the newly developed dicationic ionic liquid (IL), both coupled with a bromide (Br-) anion by using non-isothermal thermogravimetric analysis. Thermal analyses of 1-butyl-1-methylpyrrolidinium bromide [C(4)MPyr][Br] and 1,4-bis(1-methylpyrrolidinium-1-yl)butane dibromide [BisC(4)MPyr][Br-2] were conducted at a temperature range of 50-650 degrees C and subjected to various heating rates, which are 5, 10, 15, 20 and 25 degrees C/min. Thermogravimetric analysis revealed that dicationic IL, [BisC(4)MPyr][Br-2] is less thermally stable compared to monocationic [C(4)MPyr][Br]. A detailed analysis of kinetic parameters, which are the activation energy (E-a) and pre-exponential factor (log A), was calculated by using Kissinger-Akahira-Sunose (KAS), Flynn-Wall-Ozawa (FWO) and Starink. This study revealed that the average E-a and log A of [BisC(4)MPyr][Br-2] are lower than [C(4)MPyr][Br], which may be contributed to by its low thermal stability. Conclusively, it proved that the E-a and log A of ILs are strongly related to the thermal stability of ILs.
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