Abstract
Abstract Polyurethane (PU)-based coatings attract much more attention in various applications due to their unique and versatile properties. Non-polar hydrophobic PU coatings are being extensively explored as advanced coatings. Here, a novel hydrophobic PU coating is synthesized based on combination of non-polar polyols, polypropylene glycol (PPG) and hydroxyl terminated polybutadiene (HTPB). The adhesion properties, micro-hardness and water uptake behavior of samples are characterized. The effect of composition (HTPB/PPG molar ratio) on the surface properties of synthesized PU coatings are analyzed by Fourier-transformed infrared spectrometry (FTIR-ATR), contact angle measurement and atomic force microscopy (AFM). Results show sample with 0.25% molar ratio HTPB has maximum lap shear strength and negligible water absorption. So, the synthesized PU coating with optimized composition could support enough adhesion to substrate and provide hydrophobic surface properties.
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