Polyimide nano-fiber membrane with crosslinked structure and preparation thereof

A nanofiber membrane, polyimide technology, applied in the direction of chemical characteristics of fibers, single-component synthetic polymer rayon, textiles and papermaking, etc. problems, to achieve the effect of widening varieties, easy flow, and improved mechanical properties

Active Publication Date: 2012-11-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current polyimide nanofibers prepared by electrospinning are loosely arranged and fluffy, so that the excellent properties of polyimide itself, especially the mechanical properties and dimensional stability, cannot be fully reflected.

Method used

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  • Polyimide nano-fiber membrane with crosslinked structure and preparation thereof
  • Polyimide nano-fiber membrane with crosslinked structure and preparation thereof
  • Polyimide nano-fiber membrane with crosslinked structure and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A. Using the polyamic acid solution obtained by polycondensation of BPDA / pPDA, the polyamic acid nanofiber membrane was prepared by electrospinning.

[0037] B. After 2.5*10 -3 Soak in wt% ammonia water for 10s, then fully wash with deionized water, and after vacuum drying, use gradient thermal imidization process to imidize to prepare polyimide nanofiber membrane. The morphology of the obtained fiber membrane is shown in the attached figure 1 (b) shown.

Embodiment 2

[0039] A. Using the polyamic acid solution obtained by polycondensation of BPDA / pPDA, the polyamic acid nanofiber membrane was prepared by electrospinning.

[0040] B. After 2.5*10 -3 wt% ammonia water soaked for 60s, then fully cleaned with deionized water, and dried in vacuum, and then imidized by gradient thermal imidization process to prepare a polyimide nanofiber membrane. The morphology of the obtained fiber membrane is as shown in the attached figure 1 (c) shown.

Embodiment 3

[0042] A. Using the polyamic acid solution obtained by polycondensation of BPDA / pPDA, the polyamic acid nanofiber membrane was prepared by electrospinning.

[0043] B. Soak in 0.125wt% ammonia water for 10s, then fully wash with deionized water, and vacuum-dry, then adopt gradient thermal imidization process to carry out imidization to prepare polyimide nanofiber membrane, the obtained fiber membrane Looks like figure 1 (d) shown.

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PUM

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Abstract

The invention provides a polyimide nano-fiber membrane with a crosslinked structure and preparation thereof, belonging to the technical field of polyimide nano-fiber membrane. Polyamide acid solution which is a prepolymer of polyimide is synthesized from diamine and a dibasic acid anhydride monomer. And polyimide nano-fiber membrane is prepared by the electrospinning technology. The polyimide nano-fiber membrane is then treated in alkali lye with PH of 8.5-10.5 for 10s-3h, washed and dried, which is then thermal-imidized through gradient heating up and cooled down to obtain polyimide nano-fiber membrane with the crosslinked structure. The polyimide nano-fiber membrane with the crosslinked structure prepared by the invention has the advantages of high strength, simple implementation process, easiness in processing and good application prospect.

Description

technical field [0001] The invention belongs to the technical field of polyimide nanofiber membranes, and in particular relates to a preparation method of a nanofiber membrane with a crosslinked structure. Background technique [0002] Electrospinning is a process in which polymer solution or polymer melt forms fibers under the action of a high-voltage electric field. Its core is to make the charged polymer solution or melt flow and deform in the electrostatic field, and then evaporate or melt through the solvent The body is cooled and solidified, thus obtaining a fibrous substance. The diameter of fibers prepared by this method ranges from tens of nanometers to hundreds of nanometers. Electrospinning technology has become a hotspot in the development of ultrafine nanofibers due to its simple spinning equipment, short operating time, and less spinning liquid consumption. It is widely used in the preparation of various polymer nanofibers and nanofiber films. These fiber mem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08L79/08C08G73/10D01F6/78
Inventor 齐胜利龙娇秀闫晓娜田国锋武德珍
Owner BEIJING UNIV OF CHEM TECH
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