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Durham University

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Publication details for Professor Andy Monkman

MILTON, AJ & MONKMAN, AP (1993). A COMPARATIVE-STUDY OF POLYANILINE FILMS USING THERMAL ANALYSES AND IR SPECTROSCOPY. Journal Of Physics D-applied Physics 26(9): 1468-1474.
  • Publication type: Journal Article
  • ISSN/ISBN: 0022-3727
  • Keywords: FIBERS

Author(s) from Durham

Abstract

We have used dynamic mechanical and dielectric thermal analyses
together with infrared spectroscopy to identify molecular motions in
polyaniline films cast from emeraldine base powder dissolved in the
solvent N-methyl-2-pyrrolidinone (NMP). These relaxations include a
librational ring motion at around -80-degrees-C and a glass transition
(T(g)) centred at 100-degrees-C. We have also observed a permanent film
hardening process at around 180-degrees-C which is ascribed to polymer
chain crosslinking, both physical (associated with chain entanglements)
and more importantly chemical (chain-chain chemical bonding). Chemical
crosslinking can be further identified with chain defects and residual
impurities in the polymeric material. The importance of precise control
of polyaniline synthesis and processing is therefore strongly
emphasised. These results have clear implications for the thermal
orientation process in polyaniline.