Angle resolved XPS characterization of cationic polyacrylamides
Angle resolved XPS characterization of cationic polyacrylamides
In many applications surfaces are modified using polymer films and the polymers used are often complex copolymers. In biomedical applications it is critical to determine the surface properties of a substrate as it is these that mediate the cellular interactions. The surface structure of copolymer films can only rarely be established from their bulk composition alone. In this study angle resolved XPS was used to build a model of the structure of copolymer films produced on glass substrates from a family of poly(acrylamide) copolymers containing cationic blocks. The thickness of the copolymer films was demonstrated to be dependent on the concentration of the polymer solution and the ratio of non-cationic to cationic blocks in the copolymer. The data demonstrated that the cationic blocks of the copolymer preferentially segregated to the glass surface and the non-cationic poly(acrylamide) blocks preferentially segregated to the air-vacuum interface. A low concentration of the cationic functional groups was present throughout the poly(acrylamide) layer and it was suggested that this resulted from a small fraction of the cationic blocks being pulled into the poly(acrylamide) layer at points along the polymer chain where the two blocks are connected. Evidence of a thin surface hydrocarbon contamination layer was also observed.
316-323
Zekonyte, J.
4a1b52a8-fa37-45d8-88d8-593df2efe662
Williams, R.L.
ddbad5c7-b3bd-41d8-a79b-6092e7c41136
Beamson, G.
5dcfec22-b483-490b-b9fc-1eb945e30229
Weightman, P.
79c17520-37f8-42c6-9203-fc9b27ba9d14
20 January 2009
Zekonyte, J.
4a1b52a8-fa37-45d8-88d8-593df2efe662
Williams, R.L.
ddbad5c7-b3bd-41d8-a79b-6092e7c41136
Beamson, G.
5dcfec22-b483-490b-b9fc-1eb945e30229
Weightman, P.
79c17520-37f8-42c6-9203-fc9b27ba9d14
Zekonyte, J., Williams, R.L., Beamson, G. and Weightman, P.
(2009)
Angle resolved XPS characterization of cationic polyacrylamides.
Surface and Interface Analysis, 41 (4), .
(doi:10.1002/sia.3025).
Abstract
In many applications surfaces are modified using polymer films and the polymers used are often complex copolymers. In biomedical applications it is critical to determine the surface properties of a substrate as it is these that mediate the cellular interactions. The surface structure of copolymer films can only rarely be established from their bulk composition alone. In this study angle resolved XPS was used to build a model of the structure of copolymer films produced on glass substrates from a family of poly(acrylamide) copolymers containing cationic blocks. The thickness of the copolymer films was demonstrated to be dependent on the concentration of the polymer solution and the ratio of non-cationic to cationic blocks in the copolymer. The data demonstrated that the cationic blocks of the copolymer preferentially segregated to the glass surface and the non-cationic poly(acrylamide) blocks preferentially segregated to the air-vacuum interface. A low concentration of the cationic functional groups was present throughout the poly(acrylamide) layer and it was suggested that this resulted from a small fraction of the cationic blocks being pulled into the poly(acrylamide) layer at points along the polymer chain where the two blocks are connected. Evidence of a thin surface hydrocarbon contamination layer was also observed.
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Published date: 20 January 2009
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Local EPrints ID: 158475
URI: http://eprints.soton.ac.uk/id/eprint/158475
ISSN: 0142-2421
PURE UUID: 0d7825ae-32b2-41d0-badd-aa8b95290bb8
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Date deposited: 21 Jun 2010 11:17
Last modified: 14 Mar 2024 01:51
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Author:
J. Zekonyte
Author:
R.L. Williams
Author:
G. Beamson
Author:
P. Weightman
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