Abstract
AbstractIonic conduction in continuous polymer films is of two types. Inverse conduction occurs when the resistance of the film runs counter to, and direct conduction when the resistance follows, that of the external solution. The effect of pigmentation with iron oxide on the type of conduction has been examined in the case of films prepared from a pentaerythritol alkyd, a phenolformaldehyde tung oil and an epoxypolyamide varnish. It was found that upon progressive pigmentation the percentage samples showing direct conduction rose and then fell, furthermore no change in glass transition temperature was observed. It is suggested that this may be due to the segregation of low molecular weight material around the pigment particles thus screening them from the main bulk of the polymer.
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