离子液体溶剂热诱导相分离法制备聚偏氟乙烯膜

Preparation of Polyvinylidene Fluoride Membrane by Ionic Liquid Solvothermal Induced Phase Separation Method

以离子液体1-丁基-3-甲基咪唑六氟磷酸酯([BMIM]PF6)为环保稀释剂,采用热诱导相分离法(TIPS)制备聚偏氟乙烯(PVDF)膜,研究了PVDF含量和淬火温度对PVDF膜的形貌和性能的影响。结果表明,在PVDF膜制备过程中形成球粒结构,但随着PVDF含量的降低,球粒结构变为双连续结构。当PVDF的质量分数为15%时,制备的膜的纯水通量为1980 L/(m^(2)·h),且具有较高的机械强度。随着PVDF含量的增加和淬火温度的升高,膜的平均孔径和透水性减小。

Polyvinylidene fluoride(PVDF)membranes were prepared by thermally induced phase separation(TIPS)using ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate([BMIM]PF6)as an environmentally friendly diluent.The effects of PVDF content and quenching temperature on the morphology and properties of PVDF membranes were studied.The results show that the spherical structure is formed during the preparation of PVDF membrane,but with the decrease of PVDF content,the spherical structure becomes bicontinuous structure.When the mass fraction of PVDF is 15%,the pure water flux of the prepared membrane is 1980 L/(m^(2)·h),and it has high mechanical strength.With the increase of PVDF content and quenching temperature,the average pore size and water permeability of the membrane decrease.