Abstract
The fluorinated polyesters with different fluoroalkyl groups were synthesized from phthalic anhydride, epichlorohydrin, and fluorinated glycidyl ether. The structures of the modified polyesters were well characterized by proton and fluorine nuclear magnetic resonance (1H NMR and 19F NMR). Contact angle measurement was used to investigate the surface wettability. The results showed that the introduction of an extremely low concentration of fluorine content into the coatings resulted in a significant increase in contact angle of water or diiodomethane, and decrease in the surface energy. X-ray photoelectron spectroscopy (XPS) showed that the F/C molar ratio on the surface was much higher than that in the bulk, indicating the surface enrichment of fluoroalkyl groups. It was also found that fluorinated polyester with longer fluoroalkyl groups had a higher tendency to enrich on the coating surface. In addition, the chemical composition of the inner layer in near-surface area was also investigated by XPS equipped with argon bombarding. The enrichment of fluoroalkyl groups was supposed to occur in near-surface area.
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Zhu, L., Hu, X., Xiong, J. et al. Synthesis of fluorinated polyester used for hydrophobic coating: Influence of fluoroalkyl group length on enrichment behavior. Polym. Sci. Ser. B 57, 677–686 (2015). https://doi.org/10.1134/S1560090415070076
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DOI: https://doi.org/10.1134/S1560090415070076