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Polymerization of pyrrole by isopolymetallates of vanadium/molybdenum and preparation of a polypyrrole–molybdenum blues nanocomposite
Author(s) -
Ballav Nirmalya,
Biswas Mukul
Publication year - 2004
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1534
Subject(s) - polypyrrole , materials science , scanning electron microscope , fourier transform infrared spectroscopy , nanocomposite , thermogravimetric analysis , molybdenum , polymerization , conductive polymer , polymer chemistry , transmission electron microscopy , chemical engineering , nuclear chemistry , polymer , composite material , chemistry , nanotechnology , engineering , metallurgy
Abstract Oxidative polymerization of pyrrole (PY) was achieved in high yield (>90 %) by adding the monomer directly to isopolyvanadate (IPV) and isopolymolybdate (IPMo) solutions at selected pH. In the case of the IPV solution instantaneous precipitation of a black mass was obtained while in the IPMo solution in situ precipitation of polypyrrole (PPY) onto molybdenum blues (MB) formed through reduction of IPMo by PY resulting in a PPY‐encapsulated MB nanocomposite (PPY–MB). Formation of PPY was confirmed from Fourier‐transform infrared (FTIR) and thermogravimetric (TG) analyses. Transmission electron microscope (TEM) photographs for the composite revealed the formation of spherical particles of average size ≈75 nm. Scanning electron microscope (SEM) analyses showed the distinctive morphological patterns for PPY and PPY–MB composite. The direct current conductivity values for PPY prepared by IPV, IPMo and PPY–MB were of the order of 10 −2 , 10 −4 and 10 −6 S cm −1 , respectively. Copyright © 2004 Society of Chemical Industry