Abstract

Carbon black—polymer composites made either by extrusion or by ultrasonic irradiation and subsequent solvent casting into films gave rise to a conduction electron spin resonance (CESR) signal. This narrow CESR signal with a linewidth (Δ H pp) of 3 G was shown to be equivalent to the signal produced upon electrochemical reduction of the carbon black. The broad CESR signal associated with charge carriers in this black can also be used to probe polymer—carbon black interactions by observing changes in linewidth. Inclusion of a surfactant in the composite during extrusion results in its adsorption onto the carbon black. This leads to a reduction in the narrow CESR signal and an increase in the Δ H pp of the broad CESR signal.

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