Abstract

The methods of viscosimetry, conductometry, densimetry, and differential scanning calorimetry are used for studying the physicochemical properties of cations (1-butyl-3-methylimidazolium [BuMeIm]⁺, N-butylmethylpyrrolidinium [BuMePyrr]⁺, and methytrioctylammonium [MeOc₃Am]⁺) and their effect on the transport properties of bis(trifluoromethylsulfonyl)imide ionic liquids (IL). It is shown that ILs formed by cyclic amines ([BuMeIm]⁺ and [BuMePyrr]⁺) as the cations demonstrate the close values and temperature dependences of viscosity and conductivity. The cation [MeOc₃Am]⁺ predetermines the difference in the IL structure and, thus, a substantial difference in the transport properties of the melt. For salts [BuMeIm][Tf₂N], [BuMePyrr][Tf₂N], and [MeOc₃Am][Tf₂N] at 293 К, the following transport characteristics are observed: viscosity 57.7, 88.1, and 726.5 mPa s; specific conductivity 0.376, 0.252, and 0.005 S m^–1; activation energy of conductivity 21, 21, and 35 kJ mol^–1; degree of “ionicity” 0.92, 0.94, and 1.00, respectively. Using the equation of Vogel–Fulcher–Tammann and based on the temperature dependences of specific conductivity and viscosity, the ideal glass transition temperatures are calculated for liquids under study. In the positive temperature range, a linear correlation is observed between the conductivity and the cation volume in these ionic liquids.

中文翻译：

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阳离子性质对双（三氟甲基磺酰基）酰亚胺离子液体输运性能的影响

抽象的

被用于研究阳离子（1-丁基-3-甲基咪唑的理化性质粘度法，电导，密度测量，和差示扫描量热法的方法[BuMeIm] ⁺，N-丁基甲基吡咯烷[BuMePyrr] ⁺，和methytrioctylammonium [MeOc ₃上午] ⁺）及其对双（三氟甲基磺酰基）亚胺离子液体（IL）传输特性的影响。结果表明，由环胺（[BuMeIm] ⁺和[BuMePyrr] ⁺）作为阳离子形成的ILs表现出粘度和电导率的近似值和温度依赖性。阳离子[MeOc ₃ Am] ⁺预先确定了IL结构的差异，因此确定了熔体传输特性的实质差异。对于293К下的盐[BuMeIm] [Tf ₂ N]，[BuMePyrr] [Tf ₂ N]和[MeOc ₃ Am] [Tf ₂ N]，观察到以下传输特性：粘度57.7、88.1和726.5 mPa s; 比电导率0.376、0.252和0.005 S m ^–1；电导率21、21和35 kJ mol ^–1的活化能; 离子度分别为0.92、0.94和1.00。使用Vogel–Fulcher–Tammann方程，并基于比电导率和粘度的温度依赖性，可以计算出所研究液体的理想玻璃化转变温度。在正温度范围内，在这些离子液体中的电导率和阳离子体积之间观察到线性相关。