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    Nanostructured and chemically modified hydrophobic polyolefin surfaces

    Year: 2006

    Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 287, Issues 1-3, 15 September 2006, Pages 175-181, 20111221

    Authors: Esa Puukilainen, Hanna-Kaisa Koponen, Zhili Xiao, Sari Suvanto and Tapani A. Pakkanen

    Organizations: Department of Chemistry, University of Joensuu, P.O. Box 111, Fin-80101, Joensuu, Finland, Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA, Department of Physics, Northern Illinois University, DeKalb, IL 60115, USA

    Hydrophobic polyolefin (PO) surfaces were prepared by perfluoropolyether (PFPE) blending and nanostructuring. Surface modifications were done by injection molding. Two high-density polyethylenes and polypropylene were melt blended with 2.0 wt.% of PFPE. Both polyethylenes formed blends with PFPE and showed improved hydrophobicity. For nanostructuring, self-ordered nanoporous mold inserts were fabricated by anodizing aluminum in polyprotic acid. Nanostructured samples were prepared with nanoporous anodic aluminum oxide masks from pure polyolefins and from PO/PFPE blends containing 2 wt.% PFPE. Nanostructuring had a marked effect on the contact angle between injection moldable polyolefins and water: well-arranged, high aspect ratio nanostructure was found over the entire surface.