Densities (ρ) and viscosities (η) for the ternary system of decalin (1) + methylcyclohexane (2) + cyclopentanol (3) and three corresponding binary systems have been measured over the whole composition range at 11 temperature points from 293.15 K to 343.15 K under atmospheric pressure (0.1 MPa). The excess molar volumes (V m E ) and viscosity deviations (Δη) of binary systems have been calculated and further fitted with the Redlich−Kister equation, while corresponding physical data of the ternary system have been correlated via the Clibuka, Singh, Nagata-Tamura, and Redlich−Kister equations. The V m E values are negative for the binary system of decalin (1) + methylcyclohexane (2) with a minimum when the moles of the two components are similar. For the system of decalin (1) + cyclopentanol (2), the V m E values are always positive with a maximun at about x 1 = 0.6. At the same time, a sigmoid curve can be observed for the system of methylcyclohexane (1) + cyclopentanol (2). The minimum and maximum appear around x 1 = 0.2 and x 1 = 0.9, respectively. The Δη values of the three binary systems are all negative and the absolute values decrease with increase in temperature. For the ternary system, the V m E values are partially negative and the Δη values are negative over the entire concentration range. The nonideal behaviors of the mixtures are discussed in the perspective of intermolecular interaction and structural effect.

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Measurements on densities (ρ) and viscosities (η) at nine temperatures from 293.15 to 333.15 K and the pressure p = 0.1 MPa for the ternary system of exo-tetrahydrodicyclopentadiene (1) + methylcyclohexane (2) + cyclopropanemethanol (3) and the corresponding binary systems have been carried out over the whole composition range. The excess molar volumes (V m E ) and viscosity deviations (Δη) of the ternary system have been calculated and fitted to the Nagata−Tamura equation, while those of the binary systems have been calculated and fitted to the Redlich−Kister equation. The excess properties and deviation phenomena were discussed from the viewpoints of molecular interactions and structural effects. These fundamental results can be used to learn the nature of mixed hydrocarbon fuels.