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Title: Thermal and conducting behaviour of emeraldine base (EB) form of polyaniline (PANI)
Authors: Chauhan, Narendra P S
Ameta, Rakshit
Ameta, Rohit
Ameta, Suresh C
Keywords: Conducting polymer;Polyaniline-emeraldine base;Two-probe conductivity method;Differential scanning calorimetry
Issue Date: Mar-2011
Publisher: NISCAIR-CSIR, India
Abstract: Emeraldine base (EB) form of polyaniline (PANI) powder is prepared by chemical oxidative polymerization using different acidic media (HCl or CF3COOH) at different temperatures (-15°C to + 5°C). The chemical structure, thermal characterization and conducting behaviour are studied by means of Fourier transform infra-red (FTIR) spectroscopy, differential scanning calorimetery (DSC) and two-probe conductivity method. These polyanilines are soluble in N-methyl-2-pyrrolidone, dimethyl sulfoxide (DMSO) and dimethylpropylene urea (DMPU). The softening temperatures of different EB range from 87.8-116.4°C, which is believed to be an indication of cross-linking. Conductivity of emeraldine base of PANI is around (0.8-1.5) × 10-6 S/cm and energy band gap is approximately 0.5 eV, and no detectable crystallinity is observed. Wide-angle XRD technique indicates that PANI- EB base is amorphous in nature.
Page(s): 118-122
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.18(2) [March 2011]

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