Abstract
AbstractIonic conduction in polymer films is of two types. Inverse conduction, I, occurs when the resistance runs counter to that of the external solution, and Direct conduction, D, when the resistance follows that of the external solution.The distribution of areas having D properties has been established for films of a pentaerythritol alkyd, a phenol‐formaldehyde tung oil and a polyamide‐cured expoxide varnish, and it is shown that D conduction cannot be ascribed to capillaries, unless they are of molecular dimensions. It is concluded that these films have a very heterogeneous structure and that I and D areas are brought about by differences in crosslinking density within the film.
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