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    Towards superhydrophobic coatings made by non-fluorinated polymers sprayed from a supercritical solution

    Year: 2013

    Journal: Journal of Supercritical Fluids, 77, pp. 134-141, 20130926

    Authors: Louise Ovaskainen, Irene Rodriguez-Meizoso, Natasha A. Birkin, Steven M. Howdle, Ulf Gedde, Lars Wågberg, Charlotta Turner

    Organizations: KTH Royal Institute of Technology, School of Chemical Science and Engineering, Department of Fibre and Polymer Technology, Teknikringen 56, SE-100 44 Stockholm, Sweden, Lund University, Department of Chemistry, Centre for Analysis and Synthesis, P.O. Box 124, SE-221 00 Lund, Sweden, School of Chemistry, The University of Nottingham, University Park, Nottingham NG7 2RD, UK, KTH, Royal Institute of Technology, The Wallenberg Wood Science Centre, Sweden

    The objective of this study was to create a superhydrophobic surface using polymers that are nonfluorinatedand applying them to a surface via rapid expansion of a supercritical solution (RESS). Solubilitystudies of poly(ε-caprolactone) (PCL) and a statistical copolymer of vinyl acetate and vinyl pivalate(P(VAc-VPi))in supercritical carbon dioxide (scCO2) were carried out using an extraction procedure. Itwas found that the most suitable process parameters for spraying these polymers using the RESS techniquewere 30 MPa, 40 ◦C and 10% (v/v) acetone as a co-solvent. The surfaces produced were characterizedin terms of their morphology and hydrophobic properties by scanning electron microscopy and contactangle measurements, respectively. The most hydrophobic surfaces were obtained by spraying the P(VAc-VPi) copolymers, giving advancing water contact angles in the range of 120–155◦ due to the hydrophobiccharacter of the polymer and the microstructure formed with the RESS technique. These results showgreat promise for the creation of superhydrophobic surfaces using non-fluorinated polymers applied tosurfaces via RESS technique.