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Solvoconductivity of polyconjugated polymers: the roles of polymer oxidation degree and solvent electrical permittivity (Articolo in rivista)

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Solvoconductivity of polyconjugated polymers: the roles of polymer oxidation degree and solvent electrical permittivity (Articolo in rivista) (literal)

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Vercelli B., Zecchin S., Comisso N., Zotti G., Berlin A., Dalcanale E., Groenendaal L.B. (2002)
Solvoconductivity of polyconjugated polymers: the roles of polymer oxidation degree and solvent electrical permittivity
in Chemistry of materials
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Vercelli B., Zecchin S., Comisso N., Zotti G., Berlin A., Dalcanale E., Groenendaal L.B. (literal)

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The solvoconductive properties of low-defect anodically coupled polypyrroles and polythiophenes, made so they are able to be solvated by organic vapors with suitable substituents, have been studied. The investigation was performed by contemporary conductivity and electrochemical quartz crystal microbalance analysis of the polymer films as a function of the solvent vapor partial pressure. Solvoconductivity was measured at two doping levels (lightly and heavily doped) of the polymers and for a series of solvents in a wide range of dielectric constants. Lightly doped polymers are responsive to vapors whereas heavily doped polymers do no respond at all. For the sensitive polymers the response follows the electrical permittivity of the solvent s with respect to that of the polymer p, in the sense that conductivity increases for s > p and decreases for s < p. A redox-type conduction model accounts for the responsive behavior of lightly doped polymers whereas a metal-like conduction model accounts for the absent responsivity of heavily doped polymers. (literal)

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Istituto CNR per l Energetica e le Interfasi, C.o Stati Uniti 4, 35127 Padova, Italy Istituto CNR di Scienze e Tecnologie Molecolari, via C.Golgi 19, 20133 Milano, Italy Dipartimento di Chimica Organica e Industriale, Unita` INSTM, Universita` di Parma, Parco Area delle Scienze 17/A, 43100 Parma, Italy Agfa Gevaert NV, R&D Materials, Chemistry Department, Septestraat 27, B-2640 Mortsel, Belgium (literal)

Titolo

Solvoconductivity of polyconjugated polymers: the roles of polymer oxidation degree and solvent electrical permittivity (literal)

Abstract

The solvoconductive properties of low-defect anodically coupled polypyrroles and polythiophenes, made so they are able to be solvated by organic vapors with suitable substituents, have been studied. The investigation was performed by contemporary conductivity and electrochemical quartz crystal microbalance analysis of the polymer films as a function of the solvent vapor partial pressure. Solvoconductivity was measured at two doping levels (lightly and heavily doped) of the polymers and for a series of solvents in a wide range of dielectric constants. Lightly doped polymers are responsive to vapors whereas heavily doped polymers do no respond at all. For the sensitive polymers the response follows the electrical permittivity of the solvent ?s with respect to that of the polymer ?p, in the sense that conductivity increases for ?s > ?p and decreases for ?s < ?p. A redox-type conduction model accounts for the responsive behavior of lightly doped polymers whereas a metal-like conduction model accounts for the absent responsivity of heavily doped polymers. (literal)

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