Dielectric dispersions in a commercial acrylonitrile‐butadiene‐styrene polymer

Abstract

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.

Dielectric, Thermal, and Mechanical Properties of Acrylonitrile Butadiene Styrene Reinforced with Used Tires

“…Pure ABS shows this type of relaxation due to the fact that its components behave as two distinct phases, as evidenced by two glass transition temperatures. Interfacial MWS processes have also been detected in ABS samples in previous work 46,47. These phenomena also occur in the case of nonhomogeneities or composite materials, such as ABS/GTR mixtures.…”

“…In addition, it appears at a temperature just above the butadiene–styrene T g1 . In amorphous polymers, the glass transition involves a structural relaxation, which is usually designated as α42,46 and that can be detected by dielectric spectroscopy. α‐Relaxations associated with a glass transition appear at temperatures just above T g , in the range of low frequencies.…”

Relaxometric Study of Secondary Transitions in Aromatic Polymers

“…This is the case of SAN where, in Figure 3, a second-order transition becomes apparent, corresponding to a hindered libration of phenyl rings. This transition, previously described by mechanical losses, 4,19 was quite difficult to measure and even more difficult to ascribe. The NMR relaxometric method shows that the attribution of this secondary transition to the loss of the phenyl libration movement is indeed correct.…”