采用溶胶-凝胶法制备了纳米SiO2颗粒，并用低表面能硅烷偶联剂对其进行改性。改性后的SiO2粒子与聚偏氟乙烯（PVDF）按一定的质量比共混，利用相转化法制备了有机无机复合微孔膜。分析了偶联剂种类及SiO2粒径对微孔膜疏水性的影响，探讨了微孔膜表面能其疏水性能的影响，并对复合膜的微观形貌进行了表征。研究结果表明：硅烷偶联剂可以有效阻止SiO2溶胶的凝胶作用，降低SiO2的表面能，而表面能对膜的疏水性有显著的影响；制备的复合微孔膜具有良好的微纳米阶层结构，疏水角达到了151°。

Organic-inorganic composite microporous membrane was fabricated by phase inversion after PVDF mixed with modified SiO2 according to a weight ratio, in which SiO2 prepared by sol-gel method was modified by low-surface-energy silane coupling agent. The impact of coupling agent types and SiO2 particles size on the hydrophobicity of the microporous film and the microtopography of the film were investigated. Results indicated that the gelation of SiO2 particles were effectively prevented by silane coupling agent with surface energy of SiO2 particles reduced, which had a significant impact on hydrophobicity of membrane; the water contact angle of the composite microporous membrane surfaces with a nicer micro-nano hierarchical structure was up to 151°.

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