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.
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
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
16 June 2000
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), .
(doi:10.1016/S0022-0728(00)00183-2).
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.
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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: http://eprints.soton.ac.uk/id/eprint/19031
ISSN: 1572-6657
PURE UUID: 6acc307b-debe-4041-83f4-d41ac8d82ecd
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Date deposited: 21 Dec 2005
Last modified: 16 Mar 2024 02:44
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Author:
E. M. Barrios
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