Dielectric and Viscous Behavior in the i-Amyl Bromide−2-Methylpentane System

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Abstract
Equilibrium and dynamic dielectric and viscous‐flow behavior in the i‐amyl bromide−2‐methylpentane system has been studied at five concentrations down to 7.7 mole % bromide (the equilibrium studies extend to more dilute solutions). Dielectric relaxation has been examined in the frequency range from 50 cps to 300 kc/sec and viscous flow in the range 102 to 107 P, the appropriate temperature ranges being practically coincident. Equilibrium dielectric constants have been measured from room temperature down to 122°K. The equilibrium dielectric constants reveal no significant short‐range correlations tending to preferentially align the dipoles. In the relaxation studies, only a single dispersion region appears at all concentrations. It is asymmetric and, except for the pure halide, not representable by any simple known dispersion function. It is qualitatively similar to the high‐frequency dispersion in the 1‐propanol−2‐methylpentane system. The distribution width shows a maximum at some intermediate concentration which suggests that environmental heterogeneity is important but this hypothesis does not seem tenable in the light of other evidence. The similarity in concentration and temperature dependences of dielectric relaxation and shear viscosity supports the idea that a large molecular region is involved in the relaxation process so that individual molecular interactions tend to be averaged.

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