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    袁国林, 许振良, 魏永明. 热处理对PVDF-PFSA中空纤维共混超滤膜结构及性能的影响[J]. 华东理工大学学报(自然科学版), 2009, (4): 501-505.
    引用本文: 袁国林, 许振良, 魏永明. 热处理对PVDF-PFSA中空纤维共混超滤膜结构及性能的影响[J]. 华东理工大学学报(自然科学版), 2009, (4): 501-505.
    Effect of Heat-Treatment on Morphology and Performance of PVDF-PFSA Hollow Fiber UF Blend Membranes[J]. Journal of East China University of Science and Technology, 2009, (4): 501-505.
    Citation: Effect of Heat-Treatment on Morphology and Performance of PVDF-PFSA Hollow Fiber UF Blend Membranes[J]. Journal of East China University of Science and Technology, 2009, (4): 501-505.

    热处理对PVDF-PFSA中空纤维共混超滤膜结构及性能的影响

    Effect of Heat-Treatment on Morphology and Performance of PVDF-PFSA Hollow Fiber UF Blend Membranes

    • 摘要: 以聚偏氟乙烯(PVDF)与全氟磺酸(PFSA)为共混膜材料,采用湿法纺丝制备了中空纤维共混超滤膜,考察了热处理温度与热处理时间对共混膜的渗透性能、膜结构、受热收缩率及机械性能的影响。结果表明:随热处理温度的升高,截留率先增加后降低,纯水通量先降低后升高,分别在80 ℃时达到最大值与最小值,80 ℃时PEG4000的截留率为95.0%,纯水通量为231 L/(m2·h·MPa);膜的渗透性能随热处理时间变化而变化,在15 min时出现极值;热处理使膜的支撑层结构发生转变,膜径向壁厚收缩率较大,轴向膜长度收缩率较小;热处理后中空纤维膜的断裂伸长率降低,而杨氏模量与断裂强度跟热处理后的膜支撑层结构密切相关;湿法纺制的PVDFPFSA膜,经70 ℃热处理15 min后,制得截留分子量为4 000的中空纤维共混超滤膜,其纯水通量为261 L/(m2·h·MPa)。

       

      Abstract: Poly(vinylidene fluoride) (PVDF)perfluorosulfonic acid (PFSA) hollow fiber blend membranes were prepared by wet-spinning method. The effects of the heat-treatment temperature and time on the morphology, permeation performance and mechanical properties of the membranes were investigated. The results show that upon increasing the heattreatment temperature the retention rate reaches a maximum of 95.0% for PEG4000 at 80 °C while the flux shows a minimum of 231 L/(m2·h·MPa) for pure water at the same heat-treatment temperature. The appropriate heat-treatment time was 15 min for heat-treatment at 70 ℃. The morphology of the membranes was changed by heattreatment as examined by scanning electronic microscopy (SEM). The hollow fiber membranes are shrank after the heat-treatment, and the axial shrinkage ratio of the membrane is smaller than the radial one. The elongation at break declines after heat-treatment. The Young′s modulus and the break strength of the hollow fiber membranes closely correlate to the membrane structure after heat-treatment. The PVDFPFSA hollow fiber blend membranes heat-treated for 15 min at 70 °C have a cut-off molecular weight of 4 000 and flux of 261 L/(m2·h·MPa) for pure water.

       

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