Piezo-active composite systems based on porous polyvinylidene fluoride films and conducting polymer layers as electrodes
Keywords:polyvinylidene fluoride, polyaniline, polypyrrole, porous films, electrical conductivity, piezoelectric modulus
The study has obtained composite systems containing porous polyvinylidene fluoride films and electroconducting polymers—polyaniline and polypyrrole. Porous supports were prepared by melt extrusion. It was shown by scanning electron and atomic force microscopy that porous PVDF films have a relief surface, and a higher surface roughness improves hydrophilicity of supports. The layers of conducting polymers on the surface of porous supports were formed by oxidative polymerization in situ in monomer solution. It was found that conducting coatings have high adhesion of conducting layers to the porous films due to the relief surface of the PVDF film. Composites have surface and volume conductivity on the order of 101 S/cm and 10–6–10–5 S/cm, respectively. The layers of conducting polymers were used as electrodes to polarize the composites and to measure piezomodulus d31. The maximum value of d31 was 18 pC/N.
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