  The possibilities to increase the static conductivity of PVC compared to the
initial antistatic level, for PVC plasticate obtained with effective
plasticizer - a so called modifier of type A, and partial thermal
dehydrochlorination for formation of a copolymer with a system of conjugated
double bonds are investigated. To analyze the dependence of electrical
conductivity from double conjugated bonds the doping method is proposed, in
which a chemically active dopant is embedded between two thin films of the
polymer sample, not touching, and, accordingly, not interacting with the metal
electrodes. In this scheme it is found, that the for folding of two layers of
partly dehydrochlorinated PVC on the border between them the barrier layer is
formed, which can be eliminated by doping with iodine giving significant
increase in electrical conductivity. This layer does not arise in the case of
type A modifier plasticized PVC. The presence of such layer can be interpreted
as a sign of the near-surface spatial heterogeneity associated with the
presence of conduction mechanism of double conjugated bonds.
