1-乙基-3-甲基咪唑丙氨酸盐离子液体的低温热容研究  

Low-temperature heat capacity of 1-ethyl-3-methyl imidazolium alanine ionic liquid

作　　者：周彩滨[1] 战德松[1] 杨家振[2] Caibin Zhou;Desong Zhan;Jiazhen Yang(School of Stomatology, China Medical University, Shenyang 110002, China;College of Chemistry, Liaoning University, Shenyang 110036, China)

机构地区：[1]中国医科大学附属口腔医院,沈阳110002 [2]辽宁大学化学院,沈阳110036

出　　处：《中国科学：化学》2019年第7期1007-1013,共7页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金(编号:21673107);辽宁省百千万人才项目(2017)资助项目

摘　　要：本文合成了1-乙基-3-甲基咪唑丙氨酸盐离子液体,并通过核磁共振氢谱(~1H NMR)和差示扫描量热仪(DSC)对其进行了表征,确定合成了目标产物。热重分析(TGA)测试结果显示1-乙基-3-甲基咪唑丙氨酸盐离子液体的初始分解温度约为473.15 K,说明该离子液体具有较好的热稳定性。以低温绝热量热仪测试了该离子液体在80~400 K温区下的低温热容,将实验热容值拟合处理,得到了1-乙基-3-甲基咪唑丙氨酸盐离子液体固液相区的热容多项式方程,并通过热容多项式计算了该离子液体在298.15~400K的焓值、熵值以及吉布斯自由能。The 1-ethyl-3-methyl imidazolium alanine ionic liquid was synthesized and characterized by nuclear magnetic resonance(~1 H NMR) and differential scanning calorimetry(DSC). The TGA results showed the initial decomposition temperature of 1-ethyl-3-methyl imidazolium alanine ionic liquid was about 473.15 K, which indicated that the ionic liquid has relatively good thermal stability. The low-temperature heat capacity data of 1-ethyl-3-methyl imidazolium alanine ionic liquid were tested by a low-temperature adiabatic calorimeter at the temperature range from80 to 400 K. The solid liquid phase polynomial equations of 1-ethyl-3-methyl imidazolium alanine ionic liquid were obtained by fitting experimental heat capacity data. And the thermodynamic functions of the compound in the experimental temperature range were also calculated.

关 键 词：热容 热力学函数 离子液体 绝热量热 丙氨酸 

分 类 号：TQ413[化学工程]