Properties of polypyrrole doped with alkylbenzene sulfonates

Lasse Bay, Steen Skaarup, Keld West, Tanja Mazur, Ole Jørgensen, Helle D. Rasmussen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


Conducting polymers such as polypyrrole (PPy) doped with large anionic detergents have high stability in aqueous systems. PPy can be reversibly oxidised and reduced electrochemically. The redox change of PPy is accompanied by a change in volume of the polymer. This is partly ascribed to take-up of ions and solvent molecules. This volume change can be used as a polymer actuator ("artificial muscle") working in a narrow voltage range (less than 1 V). The properties of the PPy polymer are largely determined by the dopant ions and also by the deposition conditions and the substrate. A free-standing 10 mu m thick film is prepared electrochemically at a constant current from an aqueous solution of pyrrole and sodium alkylbenzene sulfonate. The mechanical properties of the film (tensile strength and Young's modulus) and the reversible linear elongation between the oxidised and reduced states are measured. Alkylbenzene sulfonates with alkyl chain lengths between 1 and 22 carbon atoms are used as dopant anion. The films made with the different anions have highly different properties and are here compared to outline the influence of the size of the anion. A maximum in linear elongation is found for p-(n-octyl)benzene sulfonate and in conductivity for p-(n-butyl)benzene sulfonate.
Original languageEnglish
Title of host publicationSmart structures and materials 2001: Electroactive polymer actuators and devices
EditorsY. Bar-Cohen
Place of PublicationBellingham, WA
PublisherSPIE - International Society for Optical Engineering
Publication date2001
Publication statusPublished - 2001
Event8th Annual Conference on Smart Structures and Materials 2001 : Electroactive Polymer Actuators and Devices - Newport Beach, CA, United States
Duration: 4 Mar 20018 Mar 2001
Conference number: 8


Conference8th Annual Conference on Smart Structures and Materials 2001
CountryUnited States
CityNewport Beach, CA
SeriesSPIE Proceedings Series, 4329

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