防污自洁聚偏氟乙烯膜的制备与表征

Preparation and Characterization of PVDF Film with Self-cleaning Property

基于荷叶效应原理,利用聚偏氟乙烯(PVDF)溶液涂膜构筑微米结构,采用氧等离子体诱导化学沉积的方法在PVDF膜表面构筑纳米结构.利用扫描电镜、原子力显微镜、X射线光电子能谱仪及接触角测量仪等研究了PVDF膜表面的微结构及化学组成与疏水性能的关系.结果表明:PVDF溶液涂膜后可形成直径约为8μm的乳突,膜表面与水的接触角为88°;化学浴沉积法可在PVDF膜上生成刺状线性网络纳米结构,该表面与水的接触角为157°,滚动角为4°;化学气相沉积法可在PVDF膜生成鸟爪状的纳米结构,与水的接触角为155°,滚动角为4°.集灰试验证明,用两种沉积方法制备的PVDF膜表面均具有良好的防污自洁性能.

Based on the lotus effect principle,polyvinylidene fluoride（PVDF） solution was used to construct the microstructure under certain preparation conditions,and the nanostructure was established by plasma enhancing chemical bath deposition.The structural morphology and hydrophobicity were explored by scanning electronic microscopy,atomic force microscopy,and contact angle measuring meter.The experimental results show that PVDF can form smooth microreliefs with diameter about 8 μm on the coating surface,and the water contact angle of PVDF film is 88°.The network nanostructure is constructed by chemical bath deposition（CBD） method,the contact angle and the sliding angle on this surface are 157° and 4°,respectively.Meanwhile,the nanostructure similar to bird claw is constructed by chemical vapor deposition（CVD） method,the contact angle and the sliding angle on this surface are 155° and 4°,respectively.Self-cleaning test shows that the PVDF film prepared by both CBD and CVD method has excellent self-cleaning property.