静电纺树枝状聚偏氟乙烯纳米纤维膜的制备
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天津工业大学 分离膜与膜过程国家重点实验室/纺织科学与工程学院,天津 300387

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国家自然科学基金资助项目(52203067,51873152);中国博士后科学基金(2021M691965)


Preparation of Electrospun Tree-Like Polyvinylidene Fluoride Nanofiber Membrane
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    摘要:

    通过向聚偏氟乙烯(PVDF)纺丝液中添加有机支化盐四丁基六氟磷酸铵(TBAHP),采用一步静电纺丝法制备了PVDF树枝状纳米纤维膜,探讨TBAHP添加量、静电纺丝工艺参数以及溶剂体积比对纤维树枝状形貌的影响,同时研究了TBAHP添加量对纤维膜力学性能、孔径、孔隙率的影响。结果表明,TBAHP摩尔浓度为0.05mol/L,N,N-二甲基甲酰胺(DMF)与丙酮(ACE)体积比为7:3,电压27kV,接收距离12cm时,制备的纳米纤维膜分支纤维较多,呈现形貌良好的树枝状结构,其断裂强度达4.93MPa远大于纯PVDF纳米纤维膜的1.82MPa,孔径仅0.2μm,孔隙率达90%,在过滤、油水分离、电化学及膜蒸馏等领域具有很好的应用前景。

    Abstract:

    By adding tetrabutylammonium hexafluorophosphate (TBAHP), an organic branching salt, to polyvinylidene fluoride (PVDF) spinning solution, PVDF tree-like nanofiber membrane was prepared by one-step electrospinning method.The effects of TBAHP addition, electrospinning process parameters and solvent volume ratio on the dendrite morphology of fibers were investigated.In addition, the effects of the amount of TBAHP on the mechanical properties,pore size and porosity of the fiber membrane were studied.The result shows that when the molar concentration of TBAHP is 0.05mol/L, the volume ratio of N, N-dimethylformamide: Acetone is 7:3, the voltage is 27kV, and the receiving distance is 12cm, the prepared nanofiber membrane has more branched fibers, showing obvious tree-like structure.The fracture stress of fiber membrane with obvious tree-like structure is 4.93 MPa which is much higher than 1.82 MPa of the pure PVDF nanofiber membrane,its pore size is only 2μm,and the porosity is 90%.The PVDF tree-like nanofiber membrane has broad applications in filtration, oil-water separation, membrane distillation and electrochemistry.

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  • 收稿日期:2022-07-25
  • 录用日期:2023-02-08
  • 网络出版日期:2022-12-20
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