CAJ | 학술논문

为了测定离子液体的热力学性质,首先合成了离子液体[C_6mim][PF_6](六氟磷酸1-甲基-3-己基咪唑)和[C_8mim][PF_6](六氟磷酸1-甲基-3-辛基咪唑).利用热重分析仪测定了[C_6mim][PF_6]和[C_8mim][PF_6]的分解温度,在293.15～338.15K范围內,用表面张力仪测定了离子液体[C_6mim][PF_6]和[C_8mim][PF_6]的表面张力,并用密度计仪测定了这两种离子液体的密度.讨论了离子液体的热膨胀系数,表面熵,表面能及晶格能等.实验及计算表明,六氟磷酸盐离子液体的分解温度比较高,且热膨胀系数在6×10~(-4)左右,热膨胀率较低.相对于离子化合物离子液体表面熵表面能较小,接近有机物.与传统无机物相比,离子液体晶格能较小.
위료측정리자액체적열역학성질,수선합성료리자액체[C_6mim][PF_6](륙불린산1-갑기-3-기기미서)화[C_8mim][PF_6](륙불린산1-갑기-3-신기미서).이용열중분석의측정료[C_6mim][PF_6]화[C_8mim][PF_6]적분해온도,재293.15～338.15K범위내,용표면장력의측정료리자액체[C_6mim][PF_6]화[C_8mim][PF_6]적표면장력,병용밀도계의측정료저량충리자액체적밀도.토론료리자액체적열팽창계수,표면적,표면능급정격능등.실험급계산표명,륙불린산염리자액체적분해온도비교고,차열팽창계수재6×10~(-4)좌우,열팽창솔교저.상대우리자화합물리자액체표면적표면능교소,접근유궤물.여전통무궤물상비,리자액체정격능교소.
For measuring the thermodynamic properties of ionic liquids, ionic liquids [C_6mim] [PF_6] (1-hexyl-3-methylimidazolium hexafluorophosphate) and [C_8mim][PF_6] (l-octyl-3-methylimidazolium hexafluorophosphate) were firstly synthesized. Thermal analysis on [C_6mim] [PF_6] and [C_8mim] [PF_6]was done, and their decomposition temperature were obtained. At 293.15～338. 15 K, surface tension and density of [C_6mim] [ PF_6 ] and [C_8mim][PF_6] were measured. From the obtained experimental data, the thermal expansion, surface entropy, surface energy, and lattice energy of the two ionic liquids were discussed. [ PF_6 ]~(-1) based ionic liquids have higher decomposition temperature, and their thermal expansions are small. In comparison with typical inorganic compound, ionic liquid has lower surface entropy which is similar to organic solvent. Ionic liquid also has much lower crystal energy than inorganic salt.