聚芴醚酮超疏水喷涂纸及其性能

以聚二甲基硅氧烷(PDMS)和纳米SiO2掺杂聚芴醚酮(PFEK),采用溶液喷涂法在纸张表面构筑了耐用的超疏水涂层.考察了PDMS和SiO2用量(以PFEK和N-甲基吡咯烷酮的质量为基准,下同)对纸张水接触角的影响.结果表明,当PDMS和SiO2用量均为2％时,纸张表面的水接触角达到最大值170?,滚动角最小值为1?,聚合物将SiO2固定在纸张纤维上,使其表面呈现微纳米粗糙结构.超疏水性源于这种疏水粗糙表面下积蓄的空气对液滴浸润的抑制.制得的PFEK/PDMS/SiO2喷涂纸经过40个摩擦周期或12次对折测试后,其水接触角仍达到150°以上,能够维持超疏水性能,并具有较好的机械稳定性.拉伸测试表明,涂层将普通纸张的拉伸强度从10.1 MPa增强到37.8 MPa,在水中浸泡15 min后,该喷涂纸的拉伸强度为25 MPa,仍具有较好的力学性能.另外,PFEK/PDMS/SiO2喷涂纸能够抵抗黏稠泥土的污染,表现良好的自清洁性能.

Preparation and properties of sprayed poly(fluoreneyl ether ketone) superhydrophobic paper

Durable superhydrophobic coatings were prepared on paper substrate by a solution-spraying method using polydimethylsiloxane (PDMS) and silicon dioxide nanospheres (SiO2) doped poly(fluoreneyl ether ketone) (PFEK). When the doping amounts of PDMS and SiO2 were both 2 wt.%, the water contact angle (WCA) of the coating was 170? and the sliding angle (SA) was 1?. From scanning electron microscope (SEM) it can be seen that the SiO2 was anchored on the surface of paper fiber by the polymer binder; the coating showed micro-nano scale roughness. According to the Cassie model, it can be inferred that the superhydrophobicity was arisen from the air accumulated under such rough surface, which suppresses the water infiltration. The WCA of the PFEK/PDMS/SiO2 coated paper was 152? after 40 cycles of wearing tests and 151? after 12 times of folding tests, suggesting that the PFEK/PDMS/SiO2 coating has excellent mechanical stability. The PFEK/PDMS/SiO2 coating enhanced the tensile strength of the paper from 10.1 MPa to 30.9 MPa, and the tensile strength was maintained after the paper was immersed in water for 15 minutes. In addition, due to its superhydrophobic property, dust and other contaminants can be easily removed by the falling water droplets, thus providing a self-cleaning surface. Moreover, the PFEK/PDMS/SiO2 coated paper can resistant the contamination of viscous mud. Therefore, the PFEK/PDMS/SiO2 coated paper is expected to have a broad application prospect.