SiO_2/聚四氟乙烯杂化超疏水涂层的制备

摘要

Hydrophobic coatings were fabricated on glass substrate with SiO2 sol and polytetrafluoroethylene via the sol-gel process.SiO2 sol nanoparticles surface were modified with silane coupling agent γ-glycidoxypropy1 trimethoxysilane.The coatings were characterized by scanning electron microscope,Fourier transform infrared spectrometry,digital microscope and thermal synthetic analysis.The experimental results showed that coatings with hierarchical nano and micro structures exhibited hydrophobicity with a water average contact angle of 156°and sliding angle of 6°.γ-Glycidoxypropy1 trimethoxysilane enhanced the hydrophobicity of the coatings.Low surface energy of polytetrafluoroethylene and special structure of the coating were responsible for the hydrophobicity of the surfaces.%通过溶胶-凝胶工艺制备了超疏水涂层。用硅烷偶联剂-环氧丙氧基丙基三甲氧基硅烷对SiO2溶胶粒子表面改性,将改性后的溶胶与聚四氟乙烯乳液杂化后在玻璃上涂膜形成超疏水涂层。用红外光谱、数码显微镜、扫描电镜、综合热分析对涂层进行了表征。实验结果表明-环氧丙氧基丙基三甲氧基硅烷能提高涂层的疏水性效果,涂层表面具有纳米/微米的粗糙结构,平均静态疏水角达到156°,滚动角6°。聚四氟乙烯低的表面能和涂层特殊的表面结构是形成超疏水的原因。