129. Organic fluorides. Part VI. The chemical and physical properties of certain fluorocarbons

Abstract

The boiling points, densities, refractive indices, and surface tensions of a number of fluorocarbons have been determined, and the variation of certain of these properties with temperature has been investigated.IN Parts I-V of this series (J., 1949, 3021, 3026; 1950, 2689, 2787, 3617) the preparation of fluorocarbons by the interaction of fluorine and of cobalt trifluoride with hydrocarbons was described. The present communication records physical properties of certain fluorocarbons the preparation of which was described in Parts 111-V.The pure fluorocarbons available were : in the n-perfluoroparaffin series, C,

Thermodynamic properties of perfluoro-n-octane

“…(9) are A 1 = 1.04566 and A 2 = 0.70186 describe liquid densities of perfluoro-n-octane with an absolute average deviation (AAD) of 0.004%. The density values reported by Kreglewski [17] and Haszeldine [18] are compared in Fig. 2 with the data measured in this work.…”

SAFT-γ force field for the simulation of molecular fluids: 8. Hetero-segmented coarse-grained models of perfluoroalkylalkanes assessed with new vapour–liquid interfacial tension data

“…This can be done by plotting the surface tension in terms of the reduced temperature T r = T /T c (calculated using the average of the estimates for T c from the Eötvos and the Guggenheim relations) as shown in Figure 4. When the surface tension is represented in terms of the reduced temperature, the experimental values for the n-alkanes [86] and perfluoro-nalkanes [115,116] are seen to follow essentially the same trend line for each chemical family. For the linear PFAA molecules with shorter alkyl chain segments (F 4 H 2 and F 6 H 2 ) the surface tensions are close to the values for the perfluoro-n-alkanes, while for the molecules with the highest degree of hydrogenation (F 4 H 6 and F 4 H 8 ) the values approach those for the n-alkanes.…”

Viscosities of Liquid Fluorocompounds

“…The pure liquid densities were taken from Dias et al 14,27,28 The dynamic viscosity data were compared with the literature data whenever possible. [16][17][18] The relative deviations between the dynamic viscosities measured in this work and those reported by other authors are presented in Figure 1. Deviations in the range (5 to 13) % are observed and are fairly constant in the studied temperature interval, with the exception of the highest temperature.…”

“…It should be mentioned that the available data are 50 to 60 years old and of poor accuracy, and the compounds used were of lower purity. [16][17][18] Moreover, the dynamic viscosity requires density data of the compounds under study, and the authors of the previous studies obtained these from experimental measurements using pycnometers. Thus, compounds of higher purity, the use of accurate fluorocarbons densities, 14,27,28 and the automated viscometer allow more accurate measurements of PFC and FC dynamic viscosities.…”

“…[16][17][18] In the framework of our project concerning the aeration improvement of multiphase biological reactors, 19 it was found to be important to have new and high-quality viscosity data for these compounds that could only be achieved due to the highpurity compounds available nowadays. In this work, kinematic viscosities were measured, as a function of temperature, using an Ubbelohde viscometer for linear, cyclic, aromatic, and one R-substituted PFC.…”