Polyimide composite nanofiber membrane with sandwich structure and preparation method thereof

A technology of composite nanofibers and nanofiber membranes, applied in fiber treatment, nanotechnology, nanotechnology, etc., can solve problems such as high water absorption rate and decreased dielectric constant, so as to improve deterioration, reduce dielectric constant, and excellent durability hot effect

Active Publication Date: 2021-11-05
SUZHOU UNIV
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AI-Extracted Technical Summary

Problems solved by technology

However, its dielectric constant has a limited decrease, and at the same time, due to t...
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Method used

The dielectric constant and dielectric loss value of above-mentioned embodiment and comparative example at 1MHz frequency are summarized in table 1, find through contrast, the dielectric constant of pure polyimide nanofiber film and dielectri...
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Abstract

The invention discloses a polyimide composite nanofiber membrane with a sandwich structure and a preparation method thereof, and belongs to the field of polymer dielectric materials. The polyimide composite nanofiber membrane with the sandwich structure comprises three layers of structures, namely a polyimide nanofiber membrane layer, a polyvinylidene fluoride-polytetrafluoroethylene nanofiber membrane layer and a polyimide nanofiber membrane layer in sequence. According to the polyimide composite nanofiber membrane with the sandwich structure and the preparation method thereof provided by the invention, the material structure is adjusted, and a fluorine-containing polymer and a porous structure are introduced, so that the dielectric constant and the dielectric loss of the polyimide nanofiber membrane are greatly reduced.

Application Domain

Technology Topic

Polyvinylidene fluorideNanofibrous membrane +14

Image

  • Polyimide composite nanofiber membrane with sandwich structure and preparation method thereof
  • Polyimide composite nanofiber membrane with sandwich structure and preparation method thereof
  • Polyimide composite nanofiber membrane with sandwich structure and preparation method thereof

Examples

  • Experimental program(4)
  • Comparison scheme(1)

Example Embodiment

[0032] Example 1
[0033] 1) Dissolve 20 g of polyimide acid in 20 g of DMAC solution, heat and stir at 80° C. for 30 min, until completely mixed uniformly, to obtain polyimide acid spinning solution. Take 0.6g polytetrafluoroethylene micro-nano powder, 0.6g polyvinylidene fluoride micro-powder, 4.4g DMF, 4.4g acetone, first mix DMF and acetone evenly, then add polytetrafluoroethylene micro-nano powder and polyvinylidene fluoride in turn Finely powdered, stirred at room temperature for 3 hours, and thoroughly mixed to obtain a polytetrafluoroethylene-polyvinylidene fluoride spinning solution.
[0034] 2) Using an electrospinning device, first spin 4mL polyimide acid solution to make an electrospun membrane, and then directly electrospin 4mL polytetrafluoroethylene-polyvinylidene fluoride mixed solution on the polyimide electrospun membrane Finally, 4 mL of polyimide acid solution was spun into an electrospun membrane to obtain a composite membrane with a sandwich structure. Among them, the spinning parameters adopted in the electrospinning process of polyimide acid electrospinning solution are: the voltage is 15KV, the distance between the spinneret and the receiving substrate is 10cm, and the feeding speed is 1mL/h. The spinning parameters used in the electrospinning process of polytetrafluoroethylene-polyvinylidene fluoride mixed electrospinning liquid are: the voltage is 12KV, the distance between the spinneret and the receiving substrate is 12cm, and the feeding speed is 1mL/h.
[0035] 3) Smooth the sandwich structure film and put it into an oven for thermal imidization. Set up the oven operation program, firstly raise the oven temperature to 350°C within 30 minutes for preliminary imidization, then keep it at 350°C for 15 minutes to further convert polyimide acid into polyimide, and finally cool to room temperature to obtain polyimide Imide/PVDF-PTFE/Polyimide sandwich film.
[0036] Dielectric performance test: Novocontrol CONCEPT 80 broadband dielectric impedance spectrometer was used to test the dielectric constant and dielectric loss of the obtained film. The room temperature is 25°C, and the frequency range is controlled at 10-10 7 Hz.

Example Embodiment

[0037]Example 2
[0038] 1) Dissolve 20 g of polyimide acid in 20 g of DMAC solution, heat and stir at 80° C. for 30 min, until completely mixed uniformly, to obtain polyimide acid spinning solution. Take 0.6g polytetrafluoroethylene micro-nano powder, 0.6g polyvinylidene fluoride micro-powder, 4.4g DMF, 4.4g acetone, first mix DMF and acetone evenly, then add polytetrafluoroethylene micro-nano powder and polyvinylidene fluoride in turn Finely powdered, stirred at room temperature for 3 hours, and thoroughly mixed to obtain a polytetrafluoroethylene-polyvinylidene fluoride spinning solution.
[0039] 2) Using an electrospinning device, first spin 4mL polyimide acid solution to make an electrospun membrane, and then directly electrospin 2mL polytetrafluoroethylene-polyvinylidene fluoride mixed solution on the polyimide electrospun membrane Finally, 4 mL of polyimide acid solution was spun into an electrospun membrane to obtain a composite membrane with a sandwich structure. Among them, the spinning parameters adopted in the electrospinning process of polyimide acid electrospinning solution are: the voltage is 15KV, the distance between the spinneret and the receiving substrate is 10cm, and the feeding speed is 1mL/h. The spinning parameters used in the electrospinning process of polytetrafluoroethylene-polyvinylidene fluoride mixed electrospinning liquid are: the voltage is 12KV, the distance between the spinneret and the receiving substrate is 12cm, and the feeding speed is 1mL/h.
[0040] 3) Smooth the sandwich structure film and put it into an oven for thermal imidization. Set up the oven operation program, firstly raise the oven temperature to 350°C within 30 minutes for preliminary imidization, then keep it at 350°C for 15 minutes to further convert polyimide acid into polyimide, and finally cool to room temperature to obtain polyimide Imide/PVDF-PTFE/Polyimide sandwich film.
[0041] Dielectric performance test: Novocontrol CONCEPT 80 broadband dielectric impedance spectrometer was used to test the dielectric constant and dielectric loss of the obtained film. The room temperature is 25°C, and the frequency range is controlled at 10-10 7 Hz.

Example Embodiment

[0042] Example 3
[0043] 1) Dissolve 20 g of polyimide acid in 20 g of DMAC solution, heat and stir at 80° C. for 30 min, until completely mixed uniformly, to obtain polyimide acid spinning solution. Take 0.6g polytetrafluoroethylene micro-nano powder, 0.6g polyvinylidene fluoride micro-powder, 4.4g DMF, 4.4g acetone, first mix DMF and acetone evenly, then add polytetrafluoroethylene micro-nano powder and polyvinylidene fluoride in turn Finely powdered, stirred at room temperature for 3 hours, and thoroughly mixed to obtain a polytetrafluoroethylene-polyvinylidene fluoride spinning solution.
[0044] 2) Using an electrospinning device, first spin 4mL polyimide acid solution to make an electrospun membrane, and then directly electrospin 8mL polytetrafluoroethylene-polyvinylidene fluoride mixed solution on the polyimide electrospun membrane Finally, 4 mL of polyimide acid solution was spun into an electrospun membrane to obtain a composite membrane with a sandwich structure. Among them, the spinning parameters adopted in the electrospinning process of polyimide acid electrospinning solution are: the voltage is 15KV, the distance between the spinneret and the receiving substrate is 10cm, and the feeding speed is 1mL/h. The spinning parameters used in the electrospinning process of polytetrafluoroethylene-polyvinylidene fluoride mixed electrospinning liquid are: the voltage is 12KV, the distance between the spinneret and the receiving substrate is 12cm, and the feeding speed is 1mL/h.
[0045] 3) Smooth the sandwich structure film and put it into an oven for thermal imidization. Set up the oven operation program, firstly raise the oven temperature to 350°C within 30 minutes for preliminary imidization, then keep it at 350°C for 15 minutes to further convert polyimide acid into polyimide, and finally cool to room temperature to obtain polyimide Imide/PVDF-PTFE/Polyimide sandwich film.
[0046] Dielectric performance test: Novocontrol CONCEPT 80 broadband dielectric impedance spectrometer was used to test the dielectric constant and dielectric loss of the obtained film. The room temperature is 25°C, and the frequency range is controlled at 10-10 7 Hz.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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