Low free energy surfaces from polyurethane/nanoteflon composites

PJ PERUZZO; PS. ANBINDER; JI AMALVY; ME PENOFF; PE MONTEMARTINI; PA OYANGUREN

Reñaca, Chile

Simposio; IV Simposio Binacional de Polímeros Argentino-Chileno, VIII Simposio Argentino de Polímeros; 2007

Universidad de Chile y Pontificia Universidad Católica de Chile,

Fluorinated polymers have a great technological interest because of the unique properties of the fluorine atom and the C-F bond. Fluorinated materials are well known for having low surface free energy that makes them water- and oil-repellent. These properties make them very useful as protective coatings like antifouling and antigraffiti paints. On the other hand, polyurethanes are perhaps the most versatile polymers. The incorporation of fluorine into polyurethane matrixes introduces changes in the final properties such as chemical, thermal, hydrolytic and oxidative stability [1]. In order to get a material with good surface properties, fluorinated modifiers need to be concentrated at the film/air interface. This goal could be obtained taking advantage of the fluorinated species migration [2-5]. In this work we synthesize polyurethane dispersions with different content of Teflon® nanoparticles. Films obtained from dispersions were characterized by contact angle, DSC, SEM, dielectric and friction coefficients determinations.