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Electrically anisotropic materials: polyaniline particles organized in a polyurethane network
Author(s) -
Stejskal Jaroslav,
Špírková Milena,
Quadrat Otakar,
Kratochvíl Pavel
Publication year - 1997
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199711)44:3<283::aid-pi878>3.0.co;2-9
Subject(s) - polyaniline , materials science , anisotropy , polyurethane , electrical resistivity and conductivity , composite material , polyaniline nanofibers , electric field , conductivity , polymerization , conductive polymer , composite number , perpendicular , polymer , polymer chemistry , electrical engineering , optics , physics , geometry , mathematics , quantum mechanics , engineering
Electrically conducting polyaniline particles were organized by an electric field in a liquid medium, which was subsequently polymerized to produce a polyurethane network. The changes in electrical conductivity during polymerization were recorded. The chains of conducting polyaniline particles oriented in the direction of the electric field became fixed in the polymer network. In this way, electrically anisotropic materials were produced. The conductivity in the direction parallel to the orientation was several times higher than that in the perpendicular one. The conductivity of these composite materials increases with temperature, while the electrical anisotropy decreases. The effect of electrical anisotropy is explained by simple geometric considerations. ©1997 SCI