Control of aggregation and crystallinity in polyaniline

Marie Angelopoulos, Ravi Saraf, Alan O. MacDiarmid, Weigong Zheng, Jing Feng, Arthur J. Epstein

Research output: Contribution to conferencePaper

3 Scopus citations

Abstract

Interchain H-bonding between amine and imine sites in emeraldine base (EB) results in aggregate formation. The aggregation is present in the as synthesized EB; the level of aggregation is dependent on the polymerization conditions. Reduction of EB to the leucoemeraldine form eliminates the imine sites and thus, the interchain H-bonding and the aggregation are also eliminated. The degree of aggregation in the EB powder determines the solubility and solution characteristics of the polymer. Solvents such as m-cresol and additives such as LiCl which dope EB are most efficient at solvating the polymer and thus, deaggregating the chains. Deaggregation facilitates chain expansion. The degree of aggregation and chain expansion in EB solutions significantly impact the overall properties of both the non-doped and doped polymer such as the optical absorption, conductivity and degree of crystallinity. Crystalline EB films are attained from solutions consisting of low polymer concentration where the polymer is well solvated and highly deaggregated. Highly, crystalline non-stretched EB films are attained by the introduction of a plasticizer which imparts local mobility allowing the chains to crystallize.

Original languageEnglish (US)
Pages1352-1358
Number of pages7
StatePublished - 1997
EventProceedings of the 1997 55th Annual Technical Conference, ANTEC. Part 3 (of 3) - Toronto, Can
Duration: Apr 27 1997May 2 1997

Other

OtherProceedings of the 1997 55th Annual Technical Conference, ANTEC. Part 3 (of 3)
CityToronto, Can
Period4/27/975/2/97

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Polymers and Plastics

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    Angelopoulos, M., Saraf, R., MacDiarmid, A. O., Zheng, W., Feng, J., & Epstein, A. J. (1997). Control of aggregation and crystallinity in polyaniline. 1352-1358. Paper presented at Proceedings of the 1997 55th Annual Technical Conference, ANTEC. Part 3 (of 3), Toronto, Can, .