Water-resistant conducting hybrids from electrostatic interactions

Conductive hybrids were prepared in a water/ethanol solution via the sol–gel process from an inorganic sol containing carboxyl groups and water‐borne conductive polyaniline (cPANI). The inorganic sol was prepared by the hydrolysis and condensation of methyltriethoxysilane with the condensed product...

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Veröffentlicht in:Journal of polymer science. Part A, Polymer chemistry Polymer chemistry, 2007-04, Vol.45 (8), p.1424-1431
Hauptverfasser: Luo, Jing, Wang, Qiguan, Wang, Xianhong, Li, Ji, Zhao, Xiaojiang, Wang, Fosong
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Sprache:eng
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Zusammenfassung:Conductive hybrids were prepared in a water/ethanol solution via the sol–gel process from an inorganic sol containing carboxyl groups and water‐borne conductive polyaniline (cPANI). The inorganic sol was prepared by the hydrolysis and condensation of methyltriethoxysilane with the condensed product of maleic anhydride and aminopropyltriethoxysilane as a catalyst, for which the carboxyl counterion along the cPANI backbone acted as an electrostatic‐interaction moiety. The existence of this electrostatic interaction could improve the compatibility of the two components and contribute to the homogeneous dispersion of cPANI in the silica phase. The electrostatic‐interaction hybrids displayed a conductivity percolation threshold as low as 1.1 wt % polyaniline in an emeraldine base, showing 2 orders of magnitude higher electrical conductivity than that without electrostatic interactions. The electrostatic‐interaction hybrids also showed good water resistance; the electrical conductivity with a cPANI loading of 16 wt % underwent a slight change after 14 days of soaking in water. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 1424–1431, 2007 A novel electrostatic‐interaction conductive hybrid with good water stability was prepared in a water/ethanol solution by a sol–gel process from an inorganic sol containing carboxyl groups and water‐borne conductive polyaniline (cPANI). The introduced electrostatic interaction greatly enhanced the compatibility between the organic and inorganic components and contributed to the homogeneous distribution of cPANI in the inorganic phase. The obtained electrostatic‐interaction hybrid films displayed 1–2 orders of magnitude higher electrical conductivity and a lower conductivity percolation threshold (1.1 wt % polyaniline) in comparison with hybrids without electrostatic interactions.
ISSN:0887-624X
1099-0518
DOI:10.1002/pola.21912