Structural investigations on polypyrrole and poly(vinyl chloride)–polypyrrole composite films

• Published in: Materials chemistry and physics Vol. 48; no. 3; pp. 240 - 245
• Main Authors: Pruneanu, S, Resel, R, Leising, G, Brie, M, Graupner, W, Oniciu, L
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15.05.1997; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Molecular anisotropy; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of specific thin films; Physics; Poly(vinyl chloride); Polymers; organic compounds; Polypyrrole; Poly(vinyl chloride); Polypyrrole; Molecular anisotropy; Molecular structure; Electrochemical method; Experimental study; Thin films; Infrared spectrometry; Electrical measurement; Quantity ratio; Composite materials; Anisotropy; Optical properties; Electrolytes; X ray scattering; Polypyrroles; Structure; Chemical synthesis; PVC
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/S0254-0584(96)01894-9

Electrically conducting films of polypyrrole (PPy) and poly(vinyl chloride)–polypyrrole (PVC–PPy) composite films, prepared by an electrochemical method, exhibit a marked increase in molecular anisotropy, with the increase of electrolyte concentration. For PVC–PPy composite films prepared at low electrolyte concentration (0.05 M LiClO 4), the X-ray scattering pattern shows an isotropic structure of the polymer. By increasing this concentration (0.15 M LiClO 4), the molecular organization changes and the polymer exhibits an anisotropic structure. For PPy doped with para-toluene sulphonate (TsO −), the anisotropic structure of the polymer was evidenced for a lower electrolyte concentration (0.01 M HTsO).