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Queen Mary University of LondonQueen Mary University of London
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School of Engineering and Materials Science
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PhD Thesis: Development of dirt resistant polymer coatings

Author: KINIMO, Thierry

Year: 2005

Supervisor(s): Ray Smith

In the construction industry, prepainted metal strip is a widely used material for fa├žade and roofs of building intended for commercial used. The physical properties of modern coatings are outstanding, however one big problem is that remains and which affects the overall coatings performance is dirt pick up.

Firstly the effect of weathering induced chemical composition change was evaluated using photo-acoustic infrared spectroscopy (PA-FTIR), and X-ray photoelectron spectroscopy (XPS). The results show the photo-oxidation processes occurs via Norrish type I and type II reaction at several sites on the polymer backbone, with the ester linkage and the melamine crosslinkage being the more reactive.

Secondly aluminosilicates have been found to be the main source of soiling with organic pollutants also responsible but to a minor extent, the presence of such dirt was confirmed by XPS analyses. Unusual peak shapes was observed on the carbon narrow scans with low binding photoelectron emitted.

Finally Polymer/organically modified layered silicates (PLS) nanocomposites are a new class of filled polymer with ultrafine phase dimension. They improve considerably the physical properties of the coating while reducing dirt pick up. The best results were obtained when the insitu intercalative method was used. However the implication of the onium salts is obscure and the relation between the nanocomposite structure and its properties is not well understood.