Abstract:
Superhydrophobic coatings were prepared by a facilespraying process from a fluorinated poly(aryl ether ketone) (FPAEK) solution containing hydrophobic fumed SiO
2 and carbon nanotube (CNT) as inorganicdopants. The FPAEK was polymerized from 4,4′-(hexafluoroisopropylidene)diphenol and 4,4-difluorophenophenone. It has been found that when the doping amounts of SiO
2 and CNT are both 1wt%, the water contact angle
WCA of the SiO
2-CNT/FPAEK coating is 167° and the sliding angle
SA is 4°. The glass transition temperature and initial decomposition temperature of the SiO
2-CNT/FPAEK coating are 170℃ and 480℃, respectively, demonstrating its excellent thermal stability. After immersing in pH=1 of HCl solution, pH=13 of NaOH solution, and 3.5wt% mass fraction of NaCl solution for 13 days, the SiO
2-CNT/FPAEK coating maintains its
WCA above 150°, demonstrating its excellent chemical stability. After 80 friction testing cycles, the SiO
2-CNT/FPAEK coating maintains the
WCA at 151°, demonstrating its good mechanical stability. In the electrochemical tests, the corrosion voltage
Ecorr of the steel plate is increased from −0.538 V to −0.112 V and the corrosion current
Jcorr is decreased from 2.105×10
−5 A to 1.94×10
−7 A after coating with the SiO
2-CNT/FPAEK, demonstrating its good anti-corrosion property. Replacing the substrate with iron plate, cement plate, glass plate and polyethyleneplate, the superhydrophobic coatings are also obtained. The dust and other contaminants can be easily removed from the superhydrophobic coatings by the falling water droplets, demonstrating its good self-cleaning property. Therefore, the SiO
2-CNT/FPAEK superhydrophobic coating has prospect applications.