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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its dielectric constant has a limited decrease, and at the same time, due to the introduction of microporous structure, the water absorption rate is still very large.

Method used

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  • 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
Comparison scheme
Effect test

Embodiment 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 spin...

Embodiment 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 spin...

Embodiment 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 spin...

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PUM

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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.

Description

technical field [0001] The invention belongs to the technical field of polymer dielectric materials, and in particular relates to a sandwich-structured polyimide composite nanofiber membrane and a preparation method thereof. Background technique [0002] With the development of 5G communication technology, higher requirements are put forward for materials. Studies have shown that compared with traditional mobile communication modes, the high frequency and high speed of 5G signal transmission will make the loss of signal transmission more serious. To meet 5G requirements, materials with lower dielectric constant (Dk) and dielectric loss (Df) are required. Ordinary pure polyimide film is widely used in the field of 4G communication, but its dielectric constant (3.4) and dielectric loss (0.02) are relatively large, and it is difficult to meet the high-frequency and high-speed signal transmission requirements of 5G. In order to meet the requirements of 5G applications, polyimi...

Claims

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Application Information

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IPC IPC(8): D04H1/728D04H1/4318D04H1/4326D04H1/4374D04H1/551D04H1/559D01D5/00B82Y30/00B82Y40/00H01B17/60
CPCD04H1/728D04H1/4318D04H1/4326D04H1/4374D04H1/559D04H1/551D01D5/0084D01D5/003B82Y30/00B82Y40/00H01B17/60D10B2401/021
Inventor 程丝于嘉诚
Owner SUZHOU UNIV
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