Temperature dependence of viscosity and density of cis-1,4/trans-1,3-dimethylcyclohexane and several other commonly used organic solvents

The dynamic viscosity (η) of the glass-forming 50:50 mixture of cis-1,4/trans-1,3-dimethylcyclohexane (ct-DMCH) was measured from 293 K down to ≈ 126 K where η ∼ 1.2 × 10⁶ mPa s. The viscosity measurements of several other commonly used solvents cover the range from 293 K down to ≈ 148 K (η ∼ 1.4 × 10⁴ mPa s) for 1-propanol (1-Prop), to ≈ 118 K (η ∼ 2.5 × 10² mPa s) for 2-methylpentane (2-MP), to ≈ 167 K (η ∼ 10.0 mPa s) for isooctane (Isooct), to ≈ 183 K (η ∼ 2.8 mPa s) for cyclopentane (CP) and down to ≈ 98 K (η ∼ 4.6 × 10² mPa s) for the 30:70 mixture of cyclopentane/isopentane (CP/IP). The density (ρ) of all solvents was measured correspondingly over appropriate temperature ranges. For the solvents studied here, the temperature dependence of the viscosity can be represented by a single Arrhenius term down to ∼ 180 K. Over a wider temperature range down to ∼ 118 K the sum of two Arrhenius terms is required, and in the low temperature regime a Vogel-Tammann-Fulcher expression is necessary to adequately describe the temperature dependence of the dynamic viscosity.