WITHDRAWN: Synthesis and characterization of a novel fluorosilicone resin based on trifluoropropylalkoxylsilane

A novel type of fluorosilicone resin (FSR) based on trifluoropropylalkoxylsilane (T monomer) was synthesized using hydrolysis-polycondensation method and cured by hydrosilylation reaction. The molecular structure of FSR was characterized by FTIR and NMR spectra. The property of the cured FSR was also investigated. TGA/DTG showed the good thermal stability of the cured FSR because of no residual terminal hydroxyl groups in FSR molecular structure. The higher molar ratios of trifluoropropyl (-CH2CH2CF3) and methyl groups (F/R molar ratios) lowered the thermal stability. DSC results indicated the only one Tg of each cured FSR and it varied from −52.0 °C to −13.2 °C. Furthermore, the cured FSR possessed good mechanical properties that the tensile strength could exceed 2.0 MPa and the elongation at break was higher than 300%. The increase of F/R molar ratios lowered the surface free energy of the cured FSR from 24.20 mN/m to 22.98 mN/m which indicated the surface hydrophobicity improved. The water and n-hexadecane contact angles were 110.4° and 34.2° that might be attributed to the smooth surfaces characterized by SEM and AFM.