Abstract
The properties of polypyrrole chemically polymerized and doped with FeCl3 have been studied by Mossbauer and EPR spectroscopy and by static magnetic susceptibility measurements (SQUID). The experimental data proved that bonding between the polymer matrix and dopant is much stronger in the case of polypyrrole than in other conducting polymer systems. The strength of this interaction can also be varied in a controlled way by absorption or desorption of water molecules by the polymer during a heating or ageing process. The nature of the spin interaction detected by Mossbauer effect, EPR and static magnetic susceptibility measurements on the same samples are also discussed.
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