Nanotech 2011

Self Cleaning Polymers and Surfaces (invited presentation)

K.Y. Law, V. Sambhy, H. Zhao
Xerox Corporation, US

Keywords: self cleaning, polymer coating, low adhesion


Inspired by the self cleaning effect of the Lotus leaf, we have been active in designing surfaces and coatings that are easy to clean or maintain in future printer products. Here the synthesis of polyurethane coatings with self cleaning property is described. Two surface modifying cross-linkers, namely Silclean 3700 and Fluorolink-D, were studied. Silclean 3700 is a hydroxyl terminated functional silicone modified polyacrylate. Fluorolink-D is a dihydroxy terminated perfluoropolyether. The surface properties of these coatings were studied by contact angle and sliding angle measurements with water and hexadecane as probe liquids. The chemical composition of the surface was studied by XPS. The data, as revealed by the Si signal from Silclean 3700 and the F signal from Fluorolink-D, showed that these surface modifying cross-linkers dominate the surface properties of the resulting polymer coatings. Results indicate that both surface modifiers increase the hydrophobicity and oleophobicity of the final coatings with a commitment reduction in the hexadecane sliding angles. The low sliding angle has translated into low adhesion, where we have been able to observe the “famous” self cleaning effect between these surfaces and organic materials (liquids). Evidence is provided that the low sliding angle, not the high contact angle, is responsible for the self cleaning effect.

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