Synthesis and Properties of Fluoralkylpolysiloxane Modified Polyurethane

Fluoralkylpolysiloxane was prepared using perfluoro octyl sulfuryl fluoride and terminal amino-silicone oil as reactants. Then, the isocyanate end capped PU prepolymer was synthesized by reacting isocyanate with a soft segment mixed by active amino-end-capping fluoralkylpolysiloxane and polyether glycol. The fluoralkylpolysiloxane modified PU was obtained after the PU prepolymer was cured by 3,3´- dichloro -4,4´ - amino-diphenyl methane (MOCA). The structure, tensile properties, dynamic mechanical analysis and water contact angle of modified PU were investigated. The results show that, when the content of PFATPS was around 10%, the two phrases were compatible and FSPU had the optimal properties. The tensile strength and elongation at break increased by 26% and 32% respectively compared to that of the unmodified. In addition, the surface water contact angle increased by 38 degree and the damping capacity also had a considerable improvement.