Coaxial electrospun polyimide micro/nano hollow structure material and preparation method thereof

A polyimide and coaxial electrospinning technology, which is applied in electrospinning, filament/thread forming, textiles and papermaking, etc., can solve the complicated preparation process, the great influence of environmental factors, and the strict control of preparation conditions, etc. problems, to achieve the effect of high yield and simple and convenient preparation process

Active Publication Date: 2017-03-15
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the methods for preparing micro-nano hollow structure materials include template method, suspension polymerization method, emulsion polymerization method and self-assembly method. However, these methods have certain shortcomings, such as complicated preparation process, strict control of preparation conditions, and great influence of environmental factors. Therefore, seeking a more convenient and controllable preparation method has always been a research hotspot of micro-nano hollow structure materials.

Method used

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  • Coaxial electrospun polyimide micro/nano hollow structure material and preparation method thereof
  • Coaxial electrospun polyimide micro/nano hollow structure material and preparation method thereof
  • Coaxial electrospun polyimide micro/nano hollow structure material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Dissolve 3 g of soluble polyimide PI (αBPDA-TFDB) in 7 g of DMF; at the same time, dissolve 2 g of polyvinylpyrrolidone PVP in 8 g of DMAc, and stir at room temperature until uniform PI solution and PVP solution. Put the PI solution in the syringe and connect it with the shell of the coaxial needle, put the PVP solution in the syringe and connect it with the core layer of the coaxial needle, as attached figure 1 As shown; at room temperature, the working voltage is 30kV, the injection speed of the shell medium is 2mL / h, the injection speed of the core medium is 1mL / h, and the receiving distance (between the Taylor cone and the aluminum foil) is 30cm, the core-shell is obtained by coaxial electrospinning structure of micro / nanofibers, the specific structure is attached figure 2 And attached image 3shown. Soak the micro / nano fibers with core-shell structure in deionized water at 50° C. for 3 hours, then take them out and dry them to obtain polyimide micro / nano hollow ...

Embodiment 2

[0034] Dissolve 2.5g of soluble polyimide PI (αBPDA-TFDB) in 7.5g of DMF; at the same time, dissolve 0.5g of PEO in 9.5g of DMAc, and stir at room temperature until uniform PI solution and PEO solution. Put the PI solution in the syringe and connect it with the shell of the coaxial needle, and put the PEO solution in the syringe and connect it with the core of the coaxial needle; the working voltage at room temperature is 10kV, and the injection speed of the shell medium is 0.5mL / h. The injection speed of the core medium was 0.1mL / h, and the receiving distance was 5cm, and the micro / nanofibers with the core-shell structure were obtained by coaxial electrospinning. Soak the micro / nano fibers with core-shell structure in deionized water at 50° C. for 3 hours, then take them out and dry them to obtain polyimide micro / nano hollow fibers.

Embodiment 3

[0036] 3 g of soluble polyimide PI (αBPDA-TFDB) was dissolved in 7 g of DMF, while 3 g of PEG was dissolved in 7 g of DMAc, and stirred at room temperature until uniform PI solution and PEG solution were obtained. Put the PI solution in the syringe and connect it with the shell layer of the coaxial needle, and put the PEG solution in the syringe and connect it with the core layer of the coaxial needle; Under the conditions of injection speed of 1mL / h and receiving distance of 30cm, micro / nanofibers with core-shell structure were obtained by coaxial electrospinning. Soak the micro / nano fibers with core-shell structure in deionized water at 50° C. for 3 hours, then take them out and dry them to obtain polyimide micro / nano hollow fibers.

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Abstract

The invention discloses a preparation method of a coaxial electrospun polyimide micro / nano hollow structure material. The preparation method uses a dimethylformamide solution of polyimide as a shell medium, uses a pore-forming agent solution as a core medium, prepares fibers of core-shell structure through coaxial electrospinning method, and then acquires the micro / nano hollow structure material after removing the core medium through post-processing. The preparation method is simple and quick in preparation process, high in yield, and capable of preparing fibers or microspheres of hollow structure.

Description

technical field [0001] The invention belongs to the field of preparation of polyimide materials, in particular to a coaxial electrospun polyimide micro / nano hollow structure material and a preparation method thereof. Background technique [0002] Polyimide (PI) refers to a class of polymer materials containing imide rings in the main chain of the molecule. This highly conjugated rigid main chain structure endows polyimide with unique properties and makes it very good. Excellent heat resistance, excellent mechanics, electricity, radiation resistance, solvent resistance and other properties, widely used in aerospace, electronics industry and other fields. Polyimide is mainly prepared by a two-step method, using aromatic tetracarboxylic dianhydride and diamine as raw materials, through condensation polymerization and high temperature or chemical imidization. The diphenyl ether-type PI-Kapton developed by DuPont in 1960 is a polyimide film obtained by polycondensation of pyrome...

Claims

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Application Information

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IPC IPC(8): D01F8/16D01F8/10D01F8/14D01F11/08D01D5/00C08J9/26C08J3/12C08L79/08
CPCC08J3/126C08J9/26C08J2201/0424C08J2379/08D01D5/003D01F8/10D01F8/14D01F8/16D01F11/08
Inventor 吴俊涛白帆郭林
Owner BEIHANG UNIV
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