TSC due to space charge in polyvinylidene fluoride

The unstretched, alpha -form polyvinylidene fluoride (PVDF) film shows the four TSC peaks, P₁, P₂, P₃ and P₄ in ascending order of temperature. The P₁ and P₂ peaks are due to the dipolar depolarisations associated with the alpha _a and alpha _c relaxations, respectively. The TSC spectrum in each film composing a three-layer specimen gave evidence for the P₃ and P₄ peaks originating from space charge near the anode. Besides, the use of a blocking PP electrode revealed the contribution of hole injection to the current in PVDF under the application of high field and also the contribution of injected positive space charge to the P₃ and P₄ peaks.