仿生超疏水PVDF膜材的研究与制备

摘要

Polyvinylidene fluoride (PVDF) as architectural membrane surface material cannot meet the requirement for antifouling and self-cleaning property.The paper prepared PVDF membrane with rough surface by the template method on the basis of the principle of "lotus effect", afterwards, PVDF membrane was modified by low temperature plasma at CF4 atmosphere to achieve low surface energy.The results showed that the roughness of membrane affected its hydrophobic property.The hydrophobic property was significantly improved by plasma modification.The static contact angle was 166.1°, rolling angle 1.4°, SEM and AFM illustrated that there existed micro-nano hierarchical structure similar to lotus leaf on the surface of membrane.The optimal conditions of plasma modification were as follows: processing time 5 min, pressure 60 Pa, power 200 W.%PVDF用于建筑膜材料的表层不能满足防污自洁要求.基于荷叶效应原理,采用模板法制备具有粗糙表面的PVDF膜,以CF4为气氛采用低温等离子体技术对薄膜进行低表面能改性.结果表明,粗糙度对膜的疏水性有影响显著;等离子体改性后膜的疏水性能显著提高,达到静态接触角为166.1°,滚动角1.4°的超疏水;SEM图、AFM图显示膜表面具有类荷叶的微纳米分级结构;等离子改性的条件为处理时间5 min,压力60 Pa,功率200 W.