Dielectric dispersions in a commercial acrylonitrile-butadiene-styrene polymer

Observations of dielectric constant and loss from ?120°C to +140°C over the frequency range 30 Hz to 3MHz are presented for a low rubber content acrylonitrile-butadiene-styrene (ABS) polymer of commercial origin. Seven dielectric dispersions are distinguished in the tan δ contour map and constant-frequency plots together with evidence for an eighth at the lowest temperatures. Possible sources for each dispersion are proposed in relation to the miscibility and morphology of the individual phases present in this multicomponent polymeric material.