准分子激光快速制备超疏水性聚偏氟乙烯材料

Super-Hydrophobic Surface of Poly(Vinylidene Fluoride) Film Fast Fabricated by KrF Excimer Laser Irradiation

在室温条件下,利用KrF准分子激光辐照技术,实现了超疏水性聚偏氟乙烯高分子材料的快速制备,最快制备时间为10 s。实验结果表明,在改性后的材料表面上,与水静态接触角由原来的53°增加到170°左右。采用原子力显微镜和X射线光电子能谱等检测手段对辐照后的材料表面进行了微观形貌和化学结构分析,结果表明激光辐照区域产生了具有极规整三维网络结构的改性层,并且C-CF2和C-F两种化学基团取代了原有的化学结构CH2和CF2成为该改性层的主体。表面的粗糙化与低表面能化学基团的共同作用,使改性后的聚偏氟乙烯表面有效地产生了较强的超疏水性能。

Superhydrophobic poly （vinylidene fluoride） is rapidly prepared by KrF excimer laser irradiation at room temperature in ten seconds. The results show that the water contact angle on modified surfaces can be increased from 53° to approximately 170°. The morphologies and chemical construction of the modified layer before and after excimer laser irradiation are analyzed with atomic force micrograph（AFM） and X-ray photoelectron spectrometry（XPS）. It is observed that a well 3D net-like microstructure is formed gradually on modified area, and the groups of C--CF2 and C--F become the subject of modified layer instead of CH2 and CF2. It is concluded that the effect of surface roughness increased and surface energy reduced together contribute to the observed superhydrophobic property of modified poly （vinylidene fluoride）.