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Durham University

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Publication details for Professor Andy Monkman

MILTON, AJ & MONKMAN, AP (1993). THERMAL-ANALYSIS OF POLYANILINE FREE STANDING FILMS. Synthetic Metals 57(1): 3571-3575.
  • Publication type: Journal Article
  • ISSN/ISBN: 0379-6779

Author(s) from Durham

Abstract

We report on Dynamic Mechanical Thermal Analysis (DMTA) studies of free
standing films of polyaniline. These films were cast from chemically
synthesised emeraldine base dissolved in the solvent
N-methyl-2-pyrrolidinone (NMP). Thermal scans show a softening 'T(g)
process' for such films at approximately 100-degrees-C. This occurs as
solvent molecules are being removed from the samples. The exact
transition temperature is dependent on the weight fraction of the NMP
solvent and increases with decreasing solvent content. Above
180-degrees-C a crosslinking of the polymer chains occurs resulting in
a hardening of the films. This crosslinked material is characterised by
a new transition at 265-degrees-C. A low temperature transition is also
seen at -80-degrees-C. This is interpreted as a torsional motion of the
aromatic rings in the polymer chains.