Syntheses and properties of fluorinated phosphate acrylates used for UV-curing coatings

The acrylated perfluoroalkyl phosphates (PFPA I and PFPA II) used as an oligomer and monomer, respectively, for UV-curing systems were synthesized and characterized with 1H NMR and FTIR spectra. The photopolymerization behavior was investigated by using photo-DSC analysis, showing that both acrylates were photopolymerized quickly to a moderate final unsaturation conversion at the presence of a photoinitiator. The limiting oxygen indices of the UV-cured pure films were determined to be over 35. The surface properties of UV-cured polyurethane films added PFPAs, respectively, as additives were investigated by measuring the contact angles. The results showed that the addition of a small amount of PFPA I or PFPA II efficiently led to the increases in the contact angles, and the decreases in the surface tension. The X-ray photoelectron spectroscopy analysis confirmed that the film surface was enriched with fluorinated species.