Anomalous effects in conductivity of thin film samples obtained by   thermolysis of PVC in solution
  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. 
V. I. Kryshtob, L. A. Apresyan, D. V. Vlasov, and T.D.Vlasova
cond-mat.mtrl-sci