Fig. 2: Synthesis of in-and-out F-PU coating materials.

a Schematic illustration of F-PU coating materials with the fluorination and urethane bonding of ethylene glycol (EG), isophorone diisocyanate (IPDI), and 1H,1H,2H,2H-Tridecafluoro-1-n-octanol (TDFO) for the synthesis of the F-PU coating materials (b) Fourier transform-infrared (FT-IR) transmittance of the F-PU coating materials (TDFO-IPDI-EG-IPDI), TDFO, and IPDI.