Polyimide/polyolefin complex fiber membrane with cross-linked structure and preparation method

A technology of polyimide fiber and composite fiber membrane, which is applied in fiber processing, filament/thread forming, textile and papermaking, etc., and can solve the problem that mechanical properties and dimensional stability cannot be reflected, there is no strong interaction, and limitations Practical application and other issues, to achieve the effect of good practical application prospects, easy operation, and widening varieties

Inactive Publication Date: 2014-12-17
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, at present, the polyimide fiber membrane prepared by electrospinning method is usually a non-woven structure, the ultrafine fibers in the fiber membrane are arranged disorderly, the volume is fluffy, and the fibers are only physically overlapped, and there is no strong interaction. This makes the excellent properties of polyimide itself, especially the mechanical properties and dimensional stability, cannot be reflected, which greatly limits its practical application.

Method used

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  • Polyimide/polyolefin complex fiber membrane with cross-linked structure and preparation method
  • Polyimide/polyolefin complex fiber membrane with cross-linked structure and preparation method
  • Polyimide/polyolefin complex fiber membrane with cross-linked structure and preparation method

Examples

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Embodiment 1

[0021] Preparation of pyromellitic dianhydride / 4,4'-diaminodiphenyl ether (PMDA / 4,4'-ODA) type polyimide (PI) / polymethyl methacrylate (PMMA) with cross-linked structure Composite fiber membrane.

[0022] A: Weigh 3.2g of PMDA and 2.9g of 4,4'-ODA with a molar ratio of 1:1, and dissolve 4,4'-ODA in 30ml of N,N-dimethylformamide (DMF) solvent at one time , after mechanical stirring for 1 hour, PMDA was added to the reaction system, polycondensed in an ice bath for 6 hours to obtain a polyamic acid solution with a moderate viscosity, the polyamic acid solution was put into a 20ml syringe, and polyamide was prepared by electrospinning technology. Acid fiber membrane, vacuum dried for 12h. Then, the polyamic acid fiber membrane is placed in an electric blast drying oven for thermal imidization with gradient temperature rise to prepare the polyimide fiber membrane. Among them, the electrospinning parameters are: spinning voltage: 25kV; spinning temperature: 25°C; spinning humidity...

Embodiment 2

[0027] Preparation of Pyromellitic Dianhydride / 4,4'-Diaminodiphenyl Ether (PMDA / 4,4'-ODA) Type Polyimide (PI) / Polyvinylidene Fluoride (PVDF) Composite with Crosslinked Structure Fiber membrane.

[0028]A: Weigh 3.2g of PMDA and 2.9g of 4,4'-ODA with a molar ratio of 1:1, and dissolve 4,4'-ODA in 30ml of N,N-dimethylformamide (DMF) solvent at one time , after mechanical stirring for 1 hour, PMDA was added to the reaction system, polycondensed in an ice bath for 6 hours to obtain a polyamic acid solution with a moderate viscosity, the polyamic acid solution was put into a 20ml syringe, and polyamide was prepared by electrospinning technology. Acid fiber membrane, vacuum dried for 12h. Then, the polyamic acid fiber membrane is placed in an electric blast drying oven for thermal imidization with gradient temperature rise to prepare the polyimide fiber membrane. Among them, the electrospinning parameters are: spinning voltage: 25kV; spinning temperature: 25°C; spinning humidity: ...

Embodiment 3

[0033] Preparation of Pyromellitic Dianhydride / 4,4'-Diaminodiphenyl Ether (PMDA / 4,4'-ODA) Type Polyimide (PI) / Polyethylene Oxide (PEO) Composite Fiber with Crosslinked Structure membrane.

[0034] A: Weigh 3.2g of PMDA and 2.9g of 4,4'-ODA with a molar ratio of 1:1, and dissolve 4,4'-ODA in 30ml of N,N-dimethylformamide (DMF) solvent at one time , after mechanical stirring for 1 hour, PMDA was added to the reaction system, polycondensed in an ice bath for 6 hours to obtain a polyamic acid solution with a moderate viscosity, the polyamic acid solution was put into a 20ml syringe, and polyamide was prepared by electrospinning technology. Acid fiber membrane, vacuum dried for 12h. Then, the polyamic acid fiber membrane is placed in an electric blast drying oven for thermal imidization with gradient temperature rise to prepare the polyimide fiber membrane. Among them, the electrospinning parameters are: spinning voltage: 20kV; spinning temperature: 25°C; spinning humidity: 50%; ...

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Abstract

The invention discloses a polyimide / polyolefin complex fiber membrane with a cross-linked structure and a preparation method. The preparation method comprises the following steps of adopting an electrospinning method to prepare a non-woven polyimide / polyolefin complex fiber membrane; carrying out controlled heating treatment to enable polyolefin fiber to be heated and melted slightly; forming melting welding points among polyimide ultrafine fibers to prepare the polyimide / polyolefin complex fiber membrane with the cross-linked structure. The cross-linked shape is formed, so that the mechanical property and the dimensional stability of the fiber membrane can be remarkably improved. The polyolefin is used, so that the cost of the complex fiber membrane is greatly reduced. In addition, the polyolefin fiber membrane can be pore-closed after being heated to a certain condition, so that the polyimide / polyolefin complex fiber membrane capable of realizing the pore close function at different temperature levels can be prepared through selecting polyolefin with different melting points. The complex fiber membrane has wide application prospect in the field of lithium-ion battery separators, and can meet the application requirement of current different lithium-ion batteries on microporous membranes with different pore close temperatures.

Description

technical field [0001] The invention belongs to the field of new polymer materials, and relates to a polyimide / polyolefin composite fiber film, in particular to a polyimide / polyolefin composite fiber film with a cross-linked structure and a preparation method. Background technique [0002] Polyimide is a kind of high-performance polymer characterized by imide ring structure. The rigid structure of this aromatic heterocycle endows polyimide with many excellent properties, such as high strength and high modulus, high and low temperature resistance, low Dielectric constant and excellent solvent resistance and dimensional stability, etc. There are many types of polyimide products, such as film (Kapton), fiber (P84), molding compound, varnish, foam, composite material, etc. With the development and maturity of electrospinning technology in recent years, there are more and more studies on the application of electrospinning technology to polyimide to prepare polyimide nanofiber me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00D04H3/005D04H3/03D04H3/14
Inventor 齐胜利闫晓娜袁利娟牟洪伟田国峰武德珍
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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