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One-step preparation method for synthesizing polyimide-based micro/nano fibers

A polyimide and nanofiber technology, applied in the field of one-step synthesis of polyimide-based micro/nanofibers, can solve the problems of low yield, hinder development, and the preparation method has not yet been reported, and achieves high porosity, The effect of reducing energy consumption and convenient operation

Inactive Publication Date: 2015-09-23
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(K.S.Yang, Dan D.Edie, D.Y.Lim, Preparation of carbon fiber web from electrostatic spinning of PMDA-ODA poly(amic acid) solution[J]. Carbon, 2003, (41): 2039-2046.) However, electrospinning To prepare nanofibers, the yield is low, which largely hinders its development
[0005] The invention relates to a method for preparing polyimide-based micro / nano fiber materials in one-step method using solution jet spinning technology. At present, this preparation method has not been reported yet

Method used

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  • One-step preparation method for synthesizing polyimide-based micro/nano fibers
  • One-step preparation method for synthesizing polyimide-based micro/nano fibers
  • One-step preparation method for synthesizing polyimide-based micro/nano fibers

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Embodiment 1

[0027] A method for preparing polyimide-based micro / nano fibers by one-step synthesis, comprising the steps of:

[0028] (1) The monomer for preparing polyimide, pyrophthalic anhydride and initiator sodium methylate are dissolved in a four-necked flask equipped with N,N-dimethylacetamide, and diisocyanate is dissolved to a certain amount N,N-dimethylacetamide was added into a four-neck flask by quantitative dropwise, heated at 100° C., and reacted for 6 hours to prepare a polyimide polymer solution.

[0029] (2) Prepare the polyimide solution obtained in step (1) to the range of spinnable concentration, and prepare an optimized polyimide nanofiber mat by using solution jet spinning technology. In the solution jet spinning technology, the apparent viscosity of the solution is 3712mPa s, the airflow temperature is 80°C, the propulsion speed is 5ml / h, the diameter of the spinneret hole is 0.3mm, the airflow slit is 0.2mm, and the air flow rate of the air inlet is 700m 3 / h, the ...

Embodiment 2

[0033] A method for preparing polyimide-based micro / nano fibers by one-step synthesis, comprising the steps of:

[0034] (1) Prepare the monomer of polyimide, 3,3'-4,4'-biphenyl dianhydride and initiator sodium hydroxide solution in the four necks equipped with N,N-dimethylacetamide Dissolve in a flask, dissolve diisocyanate into a certain amount of N,N-dimethylacetamide, add it into a four-necked flask by quantitative dropwise, heat at 110°C, and react for 8 hours to prepare polyamide imine polymer solution.

[0035] (2) Prepare the polyimide solution obtained in step (1) to the range of spinnable concentration, and prepare an optimized polyimide nanofiber mat by using solution jet spinning technology. In the solution jet spinning technology, the apparent viscosity of the solution is 4512mPa s, the airflow temperature is 90°C, the diameter of the spinneret hole is 0.5mm, the airflow slit is 0.3mm, and the gas flow rate of the air inlet is 900m 3 / h, the air flow at the exha...

Embodiment 3

[0039] A method for preparing polyimide-based micro / nano fibers by one-step synthesis, comprising the steps of:

[0040] (1) Dissolving the monomer for preparing polyimide, 3,3'-4,4'-benzophenonetetraacid dianhydride and initiator sodium methylate in a four-necked flask equipped with N-methylpyrrolidone , dissolving diisocyanate into a certain amount of N-methylpyrrolidone, adding it quantitatively to a four-neck flask, heating at 150°C, and reacting for 8 hours to prepare a polyimide polymer solution.

[0041] (2) Prepare the polyimide solution obtained in step (1) to the range of spinnable concentration, and prepare an optimized polyimide nanofiber mat by using solution jet spinning technology. In the solution jet spinning technology, the apparent viscosity of the solution is 7058mPa s, the airflow temperature is 90°C, the diameter of the spinneret hole is 0.75mm, the airflow slit is 0.5mm, and the air flow rate of the air inlet is 800m 3 / h, the air flow at the exhaust por...

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Abstract

The invention relates to a one-step preparation method for synthesizing polyimide-based micro / nano fibers. The method is distinctly characterized in that an in-situ polymerization method is used for synthesizing a polyimide polymer solution, then a solution jet spinning technology is adopted to obtain polyimide micro / nano fiber felt, and finally the polyimide-based micro / nano fibers are obtained through carbonization preparation. The polyimide micro / nano fiber felt obtained through preparation can be applied to the fields of flame-resistant materials, water filtration, high-temperature gas filtration, food processing, medicines, purification and the like. The polyimide-based micro / nano fibers are applied to the fields of anode materials of lithium ion secondary batteries, catalysts, catalyst carriers, electrodes of double-electric-layer capacitors, efficient adsorbent, structural reinforcing materials, heat conducting materials, field electron emitting materials and the like.

Description

technical field [0001] The invention relates to a method for preparing one-step synthetic polyimide-based micro / nano fibers, in particular to the preparation of one-step synthesized polyimide-based micro / nano fiber materials by adopting solution jet spinning technology. Background technique [0002] Compared with traditional fibers, micro / nano fibers have the characteristics of small diameter, light weight and large specific surface area, so they have higher surface energy and produce a series of different effects, including surface effect, small size effect, quantum size effect and macroscopic tunnel effect , so that it has a wide range of applications in separation and filtration, biological and medical treatment, battery materials, as a reinforcement of polymers, in electronic and optical devices, and in enzymes and catalysis. Although the nanofiber market is vast, the production efficiency of nanofibers is still generally low, and the number of types of nanofibers is als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C01B32/05
Inventor 王宁于卓张兴祥李国东鲁克振任建宇
Owner TIANJIN POLYTECHNIC UNIV
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