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Electrochemistry and contact angle measurements on polymer films of omega-(3-pyrrolyl)-alkanoic acids in aqueous solution

Electrochemistry and contact angle measurements on polymer films of omega-(3-pyrrolyl)-alkanoic acids in aqueous solution
Electrochemistry and contact angle measurements on polymer films of omega-(3-pyrrolyl)-alkanoic acids in aqueous solution
Films of poly(3-(pyrrolyl)-carboxylic acid), poly(3-(pyrrolyl)-butanoic acid) and poly(3-(pyrrolyl)-pentanoic acid) were prepared by electrochemical polymerisation of the monomers in acetonitrile. All three give stable voltammetry in aqueous solutions. In the case of poly(3-(pyrrolyl)-carboxylic acid) and poly(3-(pyrrolyl)-butanoic acid) this voltammetry is pH dependent. Measurement of the advancing contact angle using buffered solutions of different pH is shown to be a sensitive technique for the characterisation of the surfaces of these conducting polymer films. These contact angle titrations provide information about the acidity of the carboxylic acid groups at the surface of the polymer film. We find that the surface acid groups are about 1.5 pK(a) units less acidic than simple carboxylic acids in solution but that the pH titration curves are not broadened as is usually observed for surface bound carboxylate groups. (C)2000 Elsevier Science S.A. All rights reserved.
conducting polymer, contact angle, poly(3-(pyrrolyl)-alkanoic acids) conducting polymer, carboxylic-acid, 3-substituted polypyrroles, functional-groups, monolayer films, pyrrole, surface, polyethylene, recognition, interface
1572-6657
142-148
Bartlett, P. N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Grossel, M. C.
403bf3ff-6364-44e9-ab46-52d84c6f0d56
Barrios, E. M.
fc5c8807-fed0-4bcb-9350-3fc3b9448c6d
Bartlett, P. N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Grossel, M. C.
403bf3ff-6364-44e9-ab46-52d84c6f0d56
Barrios, E. M.
fc5c8807-fed0-4bcb-9350-3fc3b9448c6d

Bartlett, P. N., Grossel, M. C. and Barrios, E. M. (2000) Electrochemistry and contact angle measurements on polymer films of omega-(3-pyrrolyl)-alkanoic acids in aqueous solution. Journal of Electroanalytical Chemistry, 487 (2), 142-148. (doi:10.1016/S0022-0728(00)00183-2).

Record type: Article

Abstract

Films of poly(3-(pyrrolyl)-carboxylic acid), poly(3-(pyrrolyl)-butanoic acid) and poly(3-(pyrrolyl)-pentanoic acid) were prepared by electrochemical polymerisation of the monomers in acetonitrile. All three give stable voltammetry in aqueous solutions. In the case of poly(3-(pyrrolyl)-carboxylic acid) and poly(3-(pyrrolyl)-butanoic acid) this voltammetry is pH dependent. Measurement of the advancing contact angle using buffered solutions of different pH is shown to be a sensitive technique for the characterisation of the surfaces of these conducting polymer films. These contact angle titrations provide information about the acidity of the carboxylic acid groups at the surface of the polymer film. We find that the surface acid groups are about 1.5 pK(a) units less acidic than simple carboxylic acids in solution but that the pH titration curves are not broadened as is usually observed for surface bound carboxylate groups. (C)2000 Elsevier Science S.A. All rights reserved.

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More information

Published date: 16 June 2000
Keywords: conducting polymer, contact angle, poly(3-(pyrrolyl)-alkanoic acids) conducting polymer, carboxylic-acid, 3-substituted polypyrroles, functional-groups, monolayer films, pyrrole, surface, polyethylene, recognition, interface

Identifiers

Local EPrints ID: 19031
URI: https://eprints.soton.ac.uk/id/eprint/19031
ISSN: 1572-6657
PURE UUID: 6acc307b-debe-4041-83f4-d41ac8d82ecd
ORCID for P. N. Bartlett: ORCID iD orcid.org/0000-0002-7300-6900
ORCID for M. C. Grossel: ORCID iD orcid.org/0000-0001-7469-6854

Catalogue record

Date deposited: 21 Dec 2005
Last modified: 06 Jun 2018 13:10

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