Facile fabrication of durable superhydrophobic and oleophobic surface on cellulose substrate via thiol-ene click modification

摘要

The durable superhydrophobic and oleophobic coating has been fabricated based on perfluorodecanethiol fluorosilicone polyurethane (PFDT-FSPU) and thiol-modified cellulose substrate. The PFDT-FSPU was prepared from a fluorosilicone polyurethane and perfluorodecyl mercaptan via thiol-ene click chemistry. The thiolmodified cellulose substrate was obtained by a condensation reaction of 3-mercaptopropyl triethoxysilane (MPTES) and hydroxyl of cellulose substrate. The crosslinked network structure was formed by radical polymerization of double bonds in the PFDT-FSPU when the polyurethane was irradiated with ultraviolet light, and it was anchored on the surface of the cotton fibers by click reaction between the thiol-modified cellulose substrate and the PFDT-FSPU. FTIR spectroscopy illustrates that the synthesis of PFDT-FSPU and Raman spectroscopy characterizes the structure of thiol modified cotton fabric. The water and hexadecane contact angle were 158.2 degrees and 128.3 degrees respectively, and oil-repellent grade reached to 8 and antifouling grade was 4, which indicated that the coated fabric exhibited good amphiphobic and antifouling properties. Most importantly, the coated fabric showed excellent durability and can still maintain the superhydrophobicity and oleophobicity even after 600 cycles of abrasion or 30 times of washing cycles or 168 h of accelerated aging test.