Abstract
Polypyrrole was polymerized on the surface of cellulose fibres using a sequence of fibre impregnation in FeCl3 solutions, thickening and re-dispersion in a pyrrole solution. ζ-Potential and adsorption isotherms of the FeCl3-cellulose systems showed that the adsorption of iron III was associated with the formation of free Fe3+ cations in the impregnation liquor. Moreover, under the test conditions applied, the amount of adsorbed iron III was not sufficient to promote the polymerization of a adequate amount of pyrrole on the fibre surface. Optimization of the polymerization reaction required that the FeCl3 concentration in the impregnation liquor be increased to approximately 1 mol/l with a subsequent decrease of pH to approximately1.8. Based on scanning electron (SEM) micrographs and the low cellulose polymerization degree measured after pyrrole polymerization, we concluded that the decrease in the electric resistance of bulky polypyrrole/cellulose compounds was associated with a not negligible degradation of the cellulose fibres due to acid hydrolysis and the subsequent impossibility to prepare hand sheets with modified fibres due to the insufficient strength of the wet fibre network. The results of this investigation bring into question the use of FeCl3-pyrrole-cellulose systems for the elaboration of conducting paper sheets with good and stable mechanical properties.
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Beneventi, D., Alila, S., Boufi, S. et al. Polymerization of pyrrole on cellulose fibres using a FeCl3 impregnation- pyrrole polymerization sequence. Cellulose 13, 725–734 (2006). https://doi.org/10.1007/s10570-006-9077-9
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DOI: https://doi.org/10.1007/s10570-006-9077-9