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Hydrolysis and stability of thin pulsed plasma polymerised maleic anhydride coatings
Authors:Joanna Drews  Helene Launay  Keld West  Peter Kingshott
Affiliation:a Danish Polymer Centre, Technical University of Denmark, Produktionstorvet, 2800 Kgs. Lyngby, Denmark
b Polymer Department, National Laboratory for Sustainable Energy, Technical University of Denmark, Frederiksborgvej 399, 4000 Roskilde, Denmark
c Consultant, Jens Bornoes Vej 16, 2970 Hoersholm, Denmark
d Interdisciplinary Nanoscience Centre (iNANO), Faculty of Science, University of Aarhus, Building 1521, 8000 Aarhus C, Denmark
e Department of Micro and Nanotechnology, Technical University of Denmark, Frederiksborgvej 399, 4000 Roskilde, Denmark
Abstract:The stability of plasma polymerised layers has become important because of their widespread use. This study explored the hydrolysis and degradation stability of coatings of plasma polymerised maleic anhydride. Coatings made with different plasma parameters were exposed to aqueous media of different pH as a function of time. ATR-FTIR was used for structure analysis and a toluidine blue staining method allowed quantitative analysis of the hydrolysis of anhydride groups to acid groups. Coatings with constant thickness were obtained at different plasma powers and layers with varying thickness were obtained at constant plasma power by adjusting the polymerisation time. The results show that the hydrolysis resistance of the modified layer is determined by the power used in the plasma polymerisation, while changes in the chemistry of the modified layer are insignificant.
Keywords:81.65.&minus  b   82.33.Xj   52.77.&minus  j
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