Synthesis of hydrophobic fluorinated coating by further addition of isocyanate and amine groups to urethane bond

Six fluorinated precursors were synthesized from commercial polymer Fluorolink E10-H, 3-isocyanatepropyl ethoxysilane and 3-aminepropyl methoxysilane. The precursors were spin-coated on glass substrates and annealed at 150 °C for 2 h to obtain hydrophobic coatings. Chemical structure of was determined by infrared spectroscopy. Hydrophobicity was measured from drop contact angle, ranging between 70 and 93º. Hydrophobicity increased with the number of silane groups until a certain limit before losing it. Precursor P111 has the better properties (thermal stability 283.5 °C, contact angle 93°) within our work.