Molecular Motion in 2-Chlorostyrene-Styrene Copolymers from Dielectric Measurements

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Abstract
The complex dielectric constant of several poly(2‐chlorostyrene‐styrene) copolymers was measured in the range 0.1–105 Hz from 27° to 150°C. Using the WLF equation, the relaxation frequency at the glass temperature was found to be about 10−4 Hz for each copolymer, within the uncertainty in the dilatometric glass temperatures. Normalized loss peaks are compared and their shapes are found to be nearly independent of Cl concentration in the range of this study. From these curves it is concluded that in this case the observed non‐Debye behavior is not the result of dipole‐dipole interaction nor steric hindrance between chlorine atoms, but is related to the structure of the polystyrene molecule itself. Loss peaks below the glass temperature (associated with the hindered rotation of the phenyl group) were observed for the copolymer having the highest Cl concentration.

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