含氟聚芳醚酮超疏水涂层及其性能

Fluorinated poly(aryl ether ketone) superhydrophobic coatings and their properties

使用由双酚AF和4,4-二氟二苯甲酮缩聚而得的含氟聚芳醚酮(FPAEK)为树脂基体,以疏水气相SiO_(2)和碳纳米管(CNT)为无机掺杂纳米粒子,采用一步喷涂法在铝板表面制备了一种SiO_(2)-CNT/FPAEK超疏水涂层。研究发现,当SiO_(2)和CNT掺杂量都为1wt%时,所得涂层的超疏水性能最好,其水接触角W_(CA)可达到167°,滚动角S_(A)为3°。该涂层的玻璃转化温度和初始分解温度分别达到170℃和480℃,热稳定性优异。将该涂层分别在pH=1的HCl溶液、pH=13的NaOH溶液和质量分数为3.5wt%的NaCl溶液中浸泡13天,W_(CA)都维持在150°以上,说明具有较好的化学稳定性。经过80个摩擦循环测试后,该涂层的WCA还维持在151°,说明具有较好的机械稳定性。电化学测试表明,该涂层可以将马口铁的腐蚀电压E_(corr)从−0.538 V提高到−0.112 V,而腐蚀电流J_(corr)从2.105×10^(−5) A下降到1.94×10^(−7) A,说明具有优异的防腐蚀性能。此外,将基底换成常见的铁板、水泥板、玻璃板和聚乙烯塑料板,同样获得了超疏水涂层。涂层表面的污染物可以被自由滚落的水珠轻易带走,表明涂层具有良好的自清洁性能。可见,所得SiO_(2)-CNT/FPAEK超疏水涂层具有广阔的应用前景。

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.