基于PVDF的高粘附力超疏水表面的制备和性能

Preparation and properties of superhydrophobic surfaces based on PVDF with high adhesive force

使用金相砂纸打磨的方法在聚偏氟乙烯(PVDF)基片上构建了粗糙结构,然后使用氟化试剂全氟辛基二甲基氯硅烷(PFODMCS)对粗糙的PVDF基片进行化学修饰即得到高粘附力的PVDF超疏水表面。该表面对水滴接触角为153.2°,将表面倾斜90°或180°倒置后水滴仍不能滚动的,显示出表面与水滴之间具有强的粘附性。分别使用X-射线光电子能谱仪(XPS)和场发射扫描电子显微镜(FE-SEM)对PVDF超疏水表面的化学成分和微观形貌进行了表征。使用高敏感电子天平测试了超疏水表面与水滴之间的粘附力,其最大粘附力高达87μN。

Rough surfaces on pure polyvinylidene fluoride （PVDF） substrates were prepared by a simple grinding method,then the roughened surfaces of PVDF were modified by a fluoroalkylsilane, i. e. , 1H, 1H, 2H, 2H-perfluorooc- tyldimethylchlorosilane（PFODMCS）, resulting in superhydrophobicity of the modified surfaces. The as-prepared surface possessed a high water contact angle of 153.2°,and a water droplet did not slide on the surface even when the surface was tilted vertically or turned upside down, suggesting a strong adhesion between the surface and the water droplet. The surface composition and microstructures of the surface were characterized by an X-ray photoelectron spectroscopy and a Field-emis- sion scanning electron microscope, respectively. The adhesive force between the surface and the water droplet was measured by a high sensitivity photoelectron balance,and the obtained maximum adhesive force was as high as 87μN.