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    Liquefied-Wood-Based Polyurethane-Nanosilica Hybrid Coatings and Hydrophobization by Self-Assembled Monolayers of Orthotrichlorosilane (OTS)

    Year: 2015

    Journal: ACS SUSTAINABLE CHEMISTRY & ENGINEERING, Vol. 3, p 2533-2541, 20170208

    Authors: Kumar, Anuj; Petric, Marko; Kricej, Borut; Zigon, Jure; Tywoniak, Jan; Hajek, Petr; Skapin, Andrijana Sever; Pavlic, Matjaz

    Organizations: Czech Tech Univ, Fac Civil Engn, Dept Bldg Struct, Prague 16629 6, Czech Republic; Univ Ljubljana, Biotech Fac, Dept Wood Sci & Technol, Ljubljana 1000, Slovenia; Slovenian Natl Bldg & Civil Engn Inst, SI-1000 Ljubljana, Slovenia; Tech Univ Prague, Univ Ctr Energy Efficient Bldg, Bustehrad 27343, Czech Republic

    We have produced hybrid liquefied-wood-based polyurethane (LW-PU) and LW-PU/nanosilica hybrid coatings for wood substrates. The prepared hybrid polyurethane coatings were hydrophobized by self-assembled monolayers of orthotrichlorosilane (OTS) via a sol-gel dipping process. The nanosilica addition into the LW-PU system enhanced the physical properties of coatings like surface hardness and stability toward cold liquids. The OTS hydrophobized coatings were characterized by Fourier transforms infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and thermogravimetric analysis (TGA). The surface became hydrophobic as the contact angle (CA) for the water droplet on a modified hybrid coating was similar to 115 degrees and very stable. The FTIR, SEM, and EDS analysis confirmed the formation of OTS monolayers on hybrid coatings.