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Electrically conductive nanocomposites of polyaniline with poly(vinyl alcohol) and methylcellulose
Author(s) -
Chattopadhyay Dipankar,
Bain Mrinal Kanti
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.28836
Subject(s) - polyaniline , materials science , percolation threshold , vinyl alcohol , nanocomposite , aniline , conductive polymer , volume fraction , polymerization , sonication , polymer chemistry , dispersion polymerization , chemical engineering , polymer , composite material , electrical resistivity and conductivity , chemistry , organic chemistry , engineering , electrical engineering
Electrically conductive nanocomposites of HCl‐doped polyaniline (PANI–HCl) nanocolloid particles with water‐soluble and film‐forming polymers such as poly(vinyl alcohol) (PVA) and methylcellulose (MC) were prepared by the redispersion of preformed MC‐coated submicrometric PANI–HCl particles in PVA and MC solutions under sonication for 1 h and the casting of the films from the dispersions followed by drying. The submicrometric polyaniline (PANI) particles were prepared by the oxidative dispersion polymerization of aniline in an acidic (1.25 M HCl) aqueous ethanol (30 : 70) medium with MC as a steric stabilizer. The particles contained 4.7 wt % MC and had a conductivity of 7.4 S/cm. They had an oblong shape of 203 nm (length) and 137 nm (breadth). Sonication broke the oblong‐shaped particles to sizes of ∼10 nm in the PVA matrix and ∼60 nm in the MC matrix. The electrical conductivity of these films was measured, and the percolation threshold was determined. The composites had the characteristics of a low percolation threshold at a volume fraction of PANI of 2.5 × 10 −2 in the PVA matrix and at a volume fraction of 3.7 × 10 −2 in the MC matrix. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008