Terminal silanization of perfluoropolyether, polydimethylsiloxane, their block polymer and the self-assembled films on plasma-treated silicon surfaces
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In this paper, terminal silanization of perfluoropolyether, polydimethylsiloxane and their block polymer was studied and N-(Triethoxysilylpropyl) urethano-perfluoropolyether (silanized-PFPE), N-(triethoxysilylpropyl) urethano-polydimethylsiloxane (silanized-PDMS), N-(Triethoxysilylpropyl) urethano-polydimethylsiloxane -block-perfluoropolyether (silanized-PSPF) were obtained, respectively. The self-assembled films of terminal silanized polymers were prepared on plasma-treated silicon surfaces via the liquid phase deposition method (LPD), and the surface structures and properties were investigated by contact angle (CA) measurements, X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS) and atomic force microscopy (AFM). It was discovered that the hydrophilic plasma-treated silicon surfaces became hydrophobic and possessed lower surface-free energies after treating by all three silanized polymers. Among them, the self-assembled film of silanized-PFPE provided the lowest surface-free energy of 12.77 mN/m with the water contact angle being 118.2°. Self-assembled films with different deposition concentrations were prepared. Results showed that the higher the treating concentration, the higher water contact angle (WCA) obtained. The terminal silanized polymers were coated on the silicon substrates uniformly. This was identified by XPS and EDS measurements of chemical compositions on the surface of the films. AFM was used to analyze the surface morphologies of silanized PFPE-deposited films, which was found to be rough at all the different concentrations of treatment solution. A concentration of 5% could provide the completely covered film with the roughest surface and thus develop the surface with excellent hydrophobicity.
KeywordsTerminal silanization Perfluoropolyether Polydimethylsiloxane Self-assembled films Hydrophobicity
We gratefully acknowledge the financial supports by the National Natural Science Foundation of China (no. 51673137), Jiangsu Overseas Research and Training Program for University Prominent Young and Middle-aged Teachers and Presidents, and the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.
- Bielawska M, Jańczuk B, Zdziennicka A (2013) Adhesion work and wettability of polytetrafluorethylene and poly(methyl methacrylate) by aqueous solutions of cetyltrimethylammonium bromide and Triton X-100 mixture with ethanol. J Colloid Interface Sci 404:201–206. https://doi.org/10.1016/j.jcis.2013.05.002 CrossRefGoogle Scholar
- Dolmaire N, Méchin F, Espuche E, Pascault JP (2006) Modification of a hydrophilic linear polyurethane by crosslinking with a polydimethylsiloxane. Influence of the crosslink density and of the hydrophobic/hydrophilic balance on the water transport properties. J. Polym. Sci Pol Phys 44:48–61. https://doi.org/10.1002/polb.20675 CrossRefGoogle Scholar
- Ellinas K, Pujari SP, Dragatogiannis DA, Charitidis CA, Tserepi A, Zuilhof H, Gogolides E (2014) Plasma micro-nanotextured, scratch, water and hexadecane resistant, superhydrophobic, and superamphiphobic polymeric surfaces with perfluorinated monolayers. ACS Appl Mater Interface 6:6510–6524. https://doi.org/10.1021/am5000432 CrossRefGoogle Scholar
- Faucheux N, Schweiss R, Lutzow K, Werner C, Groth T (2004) Self-assembled monolayers with different terminating groups as model substrates for cell adhesion studies. Biomaterials 25:2721–2730. https://doi.org/10.1016/j.biomaterials.2003.09.069 CrossRefGoogle Scholar
- Fiorilli S, Rivolo P, Descrovi E, Ricciardi C, Pasquardini L, Lunelli L, Vanzetti L, Pederzolli C, Onida B, Garrone E (2008) Vapor-phase self-assembled monolayers of aminosilane on plasma-activated silicon substrates. J Colloid Interface Sci 321:235–241. https://doi.org/10.1016/j.jcis.2007.12.041 CrossRefGoogle Scholar
- Krawczyk J, Szymczyk K, Zdziennicka A, Jańczuk B (2013) Wettability of polymers by aqueous solution of binary surfactants mixture with regard to adhesion in polymer–solution system II. Critical surface tension of polymers wetting and work of adhesion. Int J Adhes Adhes 45:106–111. https://doi.org/10.1016/j.ijadhadh.2013.05.002 CrossRefGoogle Scholar
- Laibinis PE, Whitesides GM, Allara DL, Tao YT, Parikh AN, Nuzzo RG (1991) Comparison of the structures and wetting properties of self-assembled monolayers of n-alkanethiols on the coinage metal surfaces, copper, silver, and gold. J Am Chem Soc 113:7152–7167. https://doi.org/10.1021/ja00019a011 CrossRefGoogle Scholar
- Weinstein RD, Moriarty J, Cushnie E, Colorado R Jr, Lee TR, Patel M, Alesi WR, Jennings GK (2003) Structure, wettability, and electrochemical barrier properties of self-assembled monolayers prepared from partially fluorinated hexadecanethiols. J phys chem B 107:11626–11632. https://doi.org/10.1021/jp035067y CrossRefGoogle Scholar
- Wen K, Maoz R, Cohen H, Sagiv J, Gibaud A, Desert A, Ocko BM (2008) Postassembly chemical modification of a highly ordered organosilane multilayer: new insights into the structure, bonding, and dynamics of self-assembling silane monolayers. ACS Nano 2:579–599. https://doi.org/10.1021/nn800011t CrossRefGoogle Scholar