The preparation and properties of sodium and organomodified-montmorillonite/polypyrrole composites: A comparative study

Miroslava Mravčáková, Mária Omastová, Katarína Olejníková, B. Pukánszky, Mohamed M. Chehimi

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Two montmorillonites, an inorganic sodium montmorillonite (NaMMT) and an organo-modified montmorillonite (OMMT), were used for the preparation of montmorillonite/polypyrrole (MMT/PPy) composites. MMT particles were modified by the in situ polymerization of pyrrole in water, in aqueous solution of dodecylbenzenesulfonic acid (DBSA) used as anionic surfactant, and in water/methanol. Ferric chloride was used as oxidant in each case. Wide angle X-ray scattering (WAXS) measurements proved the intercalation of PPy into the galleries of NaMMT regardless the reaction media. In contrast, for OMMT/PPy composites, the increase of interlayer spacing depends on the preparation conditions, the highest increase in interlayer spacing was achieved in water/DBSA solution. The WAXS patterns of OMMT/PPy composites synthesized in methanol/water showed no change in interlayer spacing and the electrical conductivity of these composites was low, similar to that of NaMMT/PPy composites prepared under the same conditions. Conductivity about 1.1 S cm-1 was reached for OMMT/PPy composites containing 13.3 wt% PPy prepared in the presence of DBSA. The NaMMT/PPy composite containing 15.6 wt% PPy and prepared under the same conditions showed a conductivity of 0.26 S cm-1. X-ray photoelectron spectroscopy (XPS) proved that the surface of NaMMT/PPy composites is rich in MMT, whereas more PPy was found on the surface of OMMT/PPy composites. The conductivity of composites correlated with the N/Si atomic ratio determined from XPS results, which was taken as a semi-quantitative measure of the PPy surface fraction.

Original languageEnglish
Pages (from-to)347-357
Number of pages11
JournalSynthetic Metals
Volume157
Issue number8-9
DOIs
Publication statusPublished - May 2007

Fingerprint

Bentonite
polypyrroles
Polypyrroles
montmorillonite
Clay minerals
Sodium
sodium
preparation
composite materials
Composite materials
interlayers
Water
spacing
X ray scattering
conductivity
water
acids
Methanol
Acids
x rays

Keywords

  • Composites
  • Electrical conductivity
  • Montmorillonite
  • Polypyrrole
  • WAXS
  • XPS

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Polymers and Plastics

Cite this

The preparation and properties of sodium and organomodified-montmorillonite/polypyrrole composites : A comparative study. / Mravčáková, Miroslava; Omastová, Mária; Olejníková, Katarína; Pukánszky, B.; Chehimi, Mohamed M.

In: Synthetic Metals, Vol. 157, No. 8-9, 05.2007, p. 347-357.

Research output: Contribution to journalArticle

Mravčáková, Miroslava ; Omastová, Mária ; Olejníková, Katarína ; Pukánszky, B. ; Chehimi, Mohamed M. / The preparation and properties of sodium and organomodified-montmorillonite/polypyrrole composites : A comparative study. In: Synthetic Metals. 2007 ; Vol. 157, No. 8-9. pp. 347-357.
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