Abstract
Polyvinylidene fluoride (PVDF) films, filled with various mass fractions (w≤15%) of MgCl2, were prepared. The effect of crystalline and electronic structural variations, due to filling level, on the d.c.-electric conduction was investigated. PVDF (α- and β-) partially crystalline phases were detected by X-ray analysis. The degree of crystallinity increased by filling and a maximum β-phase content was found at w=0.5%. The infrared analysis confirmed the presence of: α- and β-phases, a head-to-head content of ∼12%, and polaron defects. UV-visible optical absorption analysis revealed a change in the optical gap value at w=0.1%. A one-dimensional phonon-assisted charge carrier hopping (interpolaron) conduction mechanism was used to interpret the d.c. electrical resistivity results. The calculated hopping site concentration implied that only 0.4 or 0.2 of the head-to-head defects contribute to the conduction process.
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