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Durham University

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Publication details for Professor Andy Monkman

Adams, PN, Laughlin, PJ, Monkman, AP & Kenwright, AM (1996). Low temperature synthesis of high molecular weight polyaniline. Polymer 37(15): 3411-3417.
  • Publication type: Journal Article
  • ISSN/ISBN: 0032-3861
  • Keywords: low temperature; synthesis; high molecular weight polyanilineCHEMICAL POLYMERIZATION; STATE; FILMS

Author(s) from Durham

Abstract

Oxidative chemical polymerization of aniline in hydrochloric acid
solution at sub-zero temperatures leads to polyaniline with a molecular
weight five to ten times higher than that prepared at room temperature.
The optimum polymerization temperature to give a polymer with the
highest yield and molecular weight has been determined, and solution
state C-13 n.m.r. spectroscopy shows that the improved polyaniline has
fewer defect sites compared to the standard polymer. Despite these
intrinsic improvements, the conductivity is of the same order of
magnitude as standard polyaniline. A solvent-cast film of polyaniline
camphorsulfonate had a conductivity of 295 S cm(-1), although this rose
to 820 S cm(-1) along the stretch direction after the film had been
uniaxially oriented. An oriented film cast from N-methyl-2-pyrrolidone
solution and protonated with methanesulfonic acid showed a conductivity
of 260 S cm(-1) along the stretch direction and 31 S cm(-1)
perpendicular to this. Copyright (C) 1996 Elsevier Science Ltd.