【摘要】 用碱对PVDF膜进行预处理，以超临界二氧化碳（CO2）为介质，二甲基甲酰胺为引发剂，将含氟单体G60C接枝到PVDF膜上，改善膜的疏水性。分别探讨了超临界CO2温度、压力对PVDF膜疏水改性的影响。结果表明：采用碱预处理对PVDF膜在超临界CO2中的疏水改性是可行的；PVDF膜经过超临界CO2疏水接枝改性后能够达到较好的疏水效果；在15.5 MPa、3 h、35℃条件下溶胀，27.5 MPa、125℃、6 h条件下接枝，PVDF膜疏水改性效果比较好。更多还原

【Abstract】 The PVDF membrane was pretreated with alkali, and the fluorinated monomer G60C was grafted to the PVDF membrane with supercritical carbon dioxide（scCO₂） as the medium and dimethylformamide as the initiator to improve the hydrophobicity of the membrane. The effect of different temperature and pressure of scCO₂ on the hydrophobic modification of PVDF membrane was discussed. The results show that the alkali pretreatment is feasible to hydrophobic modification of PVDF membrane in scCO₂. PVDF membrane can achieve better hydrophobic effect by graft modification in scCO₂. The hydrophobic modification effect of PVDF membrane was relatively good when it swelled at 15.5 MPa, 3 h,35 ℃ and grafted at 27.5 MPa, 125 ℃, 6 h.更多还原