On the Viscosities of Mixtures of Oligotrifluorochloroethylene and n-Heptadecane

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The viscosities, ηm, of mixtures of oligotrifluorochloroethylene and n-heptadecane were expressed as follows: ηm=[(1−ΦR)−n(1−ΦR)]ηH+[ΦR+n(1−ΦR)]2⁄[ΦR⁄ηR+n(1−ΦR)ηH], where ΦR is the volume fraction of the oligotrifluorochloroethylene in the mixture; ηR and ηH, the viscosities of oligotrifluorochloroethylene and n-heptadecane respectively, and n, a parameter. The two components were considered to be comparatively well compatible with each other, because the parameter, n, was small (here about 0.1). The free-volume fractions, fT, of the mixed systems, as calculated from the WLF parameters, were larger than those calculated by assuming a simple additivity between those of the two components. This effect is considered to be caused by the mitigation of physical interactions among oligotrifluorochloroethylene molecules, which are dispersed by n-heptadecane as good compatibility is achieved between the two components.
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