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High-strength polyimide nano fiber porous membrane, and preparation method and application thereof

A technology of polyimide and nanofibers, applied in textiles and papermaking, heating/cooling fabrics, non-woven fabrics, etc., can solve the problem of poor heat resistance of polyimide porous membrane, low mechanical properties of porous membrane, mechanical Low strength and other problems, to achieve the effect of improving mechanical properties, excellent thermal stability, and reducing thermal shrinkage

Inactive Publication Date: 2013-06-12
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The second technical problem solved by the present invention is to provide a preparation method for the above-mentioned high-strength polyimide nanofiber porous membrane, to overcome the problems caused by adding pore-forming substances or using a large amount of coagulation liquid in the existing method for preparing polyimide porous membrane. It leads to the disadvantages of poor heat resistance and low mechanical strength of polyimide porous membranes, and at the same time improves the mechanical properties of porous membranes prepared by electrospinning technology or the highly oriented fiber membranes can be obtained in the laboratory but the size is small The problem

Method used

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  • High-strength polyimide nano fiber porous membrane, and preparation method and application thereof
  • High-strength polyimide nano fiber porous membrane, and preparation method and application thereof
  • High-strength polyimide nano fiber porous membrane, and preparation method and application thereof

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Effect test

Embodiment 1

[0042] Synthesis of polyamic acid solution: according to the molar ratio of BTDA:ODA:DAPBI=10:10:0, first take a certain amount of 4,4'-diaminodiphenyl ether (ODA) and dissolve it in DMAc to make the total solid The content is 20%, and then mechanically stir it under the protection of nitrogen to dissolve it, and then add equimolar benzophenone tetra-acid dianhydride (BTDA) in batches, and make it continue to react for 5 hours under the nitrogen atmosphere below 25°C to obtain viscous thick polyamic acid solution. The polyamic acid solution was sealed and placed in a refrigerator for use, and its viscosity was measured to be 6.0 Pa·s after 24 hours.

[0043] Preparation of polyimide nanofiber porous membrane: The above polyamic acid solution was subjected to an electrospinning process in a high-voltage electric field of 100 kv / m, and the polyamic acid fiber porous membrane was received by a stainless steel roller. The obtained fibrous porous membrane was thermally imidized in...

Embodiment 2

[0046] The synthesis of polyamic acid solution: carry out by BTDA:ODA:DAPBI=10:4:6 molar ratio, at first adding ODA and DAPBI two kinds of diamine monomers that the molar ratio is 4:6 in the metered DMAc, make the total The solid content is 15%, and then mechanically stirred under the protection of nitrogen, and then BTDA equal to the total amount of the two diamines is added in batches, and the reaction is continued for 5 hours below 25°C in a nitrogen atmosphere to obtain a viscous polyamide acid solution. Seal the polyamic acid solution and place it in the refrigerator for use. After 24 hours, its viscosity was measured to be 4.4 Pa·s.

[0047] Preparation of the polyimide nanofiber porous membrane: the above polyamic acid solution was subjected to an electrospinning process in a high-voltage electric field of 80 kv / m, and the polyamic acid fiber porous membrane was received by a stainless steel roller. The obtained polyamic acid fiber porous membrane is subjected to therm...

Embodiment 3

[0050] The synthesis of polyamic acid solution: carry out by BTDA:ODA:DAPBI=10:6:4 molar ratio, at first adding ODA and DAPBI two kinds of diamine monomers that the molar ratio is 6:4 in the metered DMAc, make the total The solid content is 15%, and then mechanically stirred under the protection of nitrogen, and then BTDA equal to the total amount of the two diamines is added in batches, and the reaction is continued for 5 hours below 25°C in a nitrogen atmosphere to obtain a viscous polyamide acid solution. The polyamic acid solution was sealed and placed in a refrigerator for use, and its viscosity was measured to be 4.1 Pa·s after 24 hours.

[0051] Preparation of the polyimide nanofiber porous membrane: the above polyamic acid solution was subjected to an electrospinning process in a high-voltage electric field of 80 kv / m, and the polyamic acid fiber porous membrane was received by a stainless steel roller. The obtained polyamic acid fiber porous membrane is thermally imi...

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Abstract

The invention discloses a high-strength polyimide nano fiber porous membrane. The porosity of the polyimide nano fiber porous membrane is 70-85%, the average pore diameter is 100-250 nm, the glass transition temperature is 260-400 DEG C, the tensile strength is 8-70 MPa, and the dimensional shrinkage after high-temperature 200 DEG C heat treatment for 1 hour is less than 0.3%. The chemical composition of the polyimide nano fiber porous membrane is copolymerized polyimide or blended polyimide. The invention also discloses a preparation method and application of the polyimide nano fiber porous membrane. The polyimide nano fibrous membrane disclosed by the invention is a membrane material having the advantages of high strength, low dimensional change rate, high porosity and favorable thermal properties.

Description

technical field [0001] The invention relates to the technical field of polyimide nanofiber porous membrane and its preparation, in particular to a high-strength polyimide nanofiber porous membrane prepared by a high-voltage electrospinning process and its application in the field of materials. Background technique [0002] Polyimide has excellent high temperature resistance, dimensional stability, chemical resistance, mechanical properties and electrical properties, etc., and is widely used in aerospace, automotive, microelectronics, nano, separation membranes, medical appliances, tableware, biology and other fields , and its products come in a variety of forms, including resins, molding powders, composite materials, films, fibers, foams, etc. The application of polyimide in the field of structural materials and insulating materials has been recognized by people, and it has also emerged and developed rapidly in the field of functional materials, such as polyimide fibers as f...

Claims

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Application Information

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IPC IPC(8): D06C7/00D04H1/728C08G73/10C08G73/18
Inventor 于晓慧吴大勇梁卫华张艾
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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