AVS 49th International Symposium
    Applied Surface Science Tuesday Sessions
       Session AS-TuP

Paper AS-TuP7
Surface Characterisation of Fluorinated Polyether Ionomers from Aqueous Dispersions

Tuesday, November 5, 2002, 5:30 pm, Room Exhibit Hall B2

Session: Topics in Applied Surface Science
Presenter: R. Canteri, ITC-irst Centre for Scientific and Technological Research, Italy
Authors: R. Canteri, ITC-irst Centre for Scientific and Technological Research, Italy
G. Speranza, ITC-irst Centre for Scientific and Technological Research, Italy
M. Anderle, ITC-irst Centre for Scientific and Technological Research, Italy
S. Turri, Ausimont Spa Research & Development Centre, Italy
S. Radice, Ausimont Spa Research & Development Centre, Italy
Correspondent: Click to Email
The introduction of perfluoropolyether (PFPE) bifunctional macromers, in polyurethane coatings@footnote 1,2@ has lead to a substantial improvement of the durability characteristics and surface properties of the material, while maintaining the advantage of an easy application technology in a variety of environmental conditions and temperatures.@footnote 3@ In this work we present a surface characterisation by TOF-SIMS and XPS of a new series of polymer thin films containing PFPE macromers, applied in form of PolyUrethane Aqueous Dispersions (PUAD). In fact, environmental issues are forcing the development of waterborne polymer systems (dispersions or emulsions) in order to reduce the problems of solvent emissions in the atmosphere. The PUAD systems presented in this work can be defined as polyurethane ionomers, since self-dispersion in water is achieved by using co-monomers containing a NR@sub 3@ or a -COOH group, which can be salified with acids or bases. It is known that many of the performances of the coating, like low surface energy (water and oil repellence), lubrication and low friction etc, are related to the capability of fluorinated structures to stay close to the polymer-air interface. The analysis of the outermost layer of the dried waterborne coatings by TOF-SIMS is compared with analyses by XPS obtained at two different angles (90° and 15° take off angle) for sampling different thickness. These results are finally compared with those obtained on the solventborne crosslinked coatings@footnote 4@ containing similar PFPE macromers. @FootnoteText@ @footnote 1@ G. Simeone, S. Turri, M. Scicchitano, C. Tonelli, Angew. Makromol. Chem. 236 (1996) 111.@footnote 2@ S. Turri, M. Scicchitano, G. Simeone, C. Tonelli, Progr. Org. Coat. 32 (1997) 205 @footnote 3@ J. Scheirs, S. Burks, A. Locaspi, Trends Polym. Sci. 3 (1995) 74@footnote 4@ S. Turri, S. Radice, R. Canteri, G. Speranza and M. Anderle, Surface and Interface Analysis 29 (2000) 873.