Thermoreversible gels of polyaniline: Viscoelastic and electrical properties

Olli Ikkala, T. Vikki, Janne Ruokolainen, P. Hiekkataipale, Pentti Passiniemi, Tapio Mäkelä, Heikki Isotalo

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


We demonstrate that polyaniline (PANI) dissolved in dodecyl benzene sulphonic acid (DBSA) shows thermoreversible gelation. The dissolution has been performed in formic acid which allows particle-free complexes according to optical microscopy. Below the gelation temperature the materials are rubber-elastic in compression experiments, the storage modulus G' does not essentially depend on frequency, and the samples are electronically conductive. Above the gelation temperature, G' indicates flow-like behavior and drastically lower ionic conductivity is observed. These results suggest reversible, i.e. fusible, network formation. The properties are compared with gels consisting of camphor sulphonic acid (CSA) doped PANI dissolved in m-cresol which are poorly thermoreversible.
Original languageEnglish
Title of host publicationElectrical, Optical and Magnetic Properties of Organic Solid State Materials IV
Subtitle of host publicationSymposium J
EditorsJohn R. Reynolds, A.K.-Y. Jen, L.R. Dalton, M.F. Rubner, L.Y. Chiang
Place of PublicationPittsburgh
PublisherMaterials Research Society
Publication statusPublished - 1998
MoE publication typeA4 Article in a conference publication
EventElectrical, optical, and magnetic properties of organic solid-state materials IV - Boston, United States
Duration: 1 Dec 19975 Dec 1997

Publication series

SeriesMaterials Research Society Symposia Proceedings


ConferenceElectrical, optical, and magnetic properties of organic solid-state materials IV
CountryUnited States


  • polymers
  • electroactive
  • gel
  • network
  • rheology
  • electrical conductivity

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