  It was stated earlier that in the samples of PVC films plasticized by a new
type of plasticizer (modifier-A) abnormal transitions are possible from the
state of low electrical conductivity to the state of high conductivity. For the
first time a similar anomalous transition is demonstrated in thin-film samples
of (partially dehydrochlorinated) PVC obtained by thermolysis in solution,
without use of any special additives, plasticizers, ionizing radiation, etc.
  Anomalous effects of conductivity in the experimental data obtained clearly
correlate with a concentration of conjugated double bonds (polyvinylen
fragments) in the main chain of thermalized PVC macromolecules.

Materials Science