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Method for modifying polyacrylonitrile by using gamma ray irradiation

A technology of polyacrylonitrile and polyacrylonitrile fiber, which is applied in the direction of fire-resistant coatings, etc., can solve problems such as difficulty in further improvement, and achieve the effect of improving pre-oxidation efficiency and reducing process costs

Inactive Publication Date: 2012-01-04
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after decades of technological improvements, the potential of the above methods has been brought to the limit, and it is difficult to further improve

Method used

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  • Method for modifying polyacrylonitrile by using gamma ray irradiation
  • Method for modifying polyacrylonitrile by using gamma ray irradiation

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A polyacrylonitrile film (100 microns thick, 99% acrylonitrile content) is placed in a glass vacuum irradiation tube, and the air in the tube is drawn out with a vacuum pump and sealed (pressure 100Pa). Put the irradiation tube into the cobalt source and irradiate for 50 hours at a dose rate of 2kGy / h, with a total irradiation dose of 100kGy. After taking it out, the exothermic heat of cyclization was measured by DSC, and the results are listed in Table 1.

Embodiment 2

[0024] A polyacrylonitrile film (100 μm thick, 99% acrylonitrile content) was placed in a glass vacuum irradiation tube in an air atmosphere. Put the irradiation tube into the cobalt source and irradiate for 50 hours at a dose rate of 2kGy / h, with a total irradiation dose of 100kGy. After taking it out, the exothermic heat of cyclization was measured by DSC, and the results are listed in Table 1.

Embodiment 3

[0026] Put pure polyacrylonitrile fibers in a glass vacuum irradiation tube, use a vacuum pump to pump out the air in the tube and seal it. Put the irradiation tube into the cobalt source and irradiate for 50 hours at a dose rate of 2kGy / h, with a total irradiation dose of 100kGy. After taking it out, the exothermic heat of cyclization was measured by DSC, and the results are listed in Table 1.

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Abstract

The invention provides a method for modifying polyacrylonitrile (PAN) by using gamma ray irradiation. Being subjected to the gamma ray irradiation in air, inert atmosphere or a vacuum, the heat release of the cyclized PAN can be reduced in the process of heat treatment; and being subjected to the pretreatment of the gamma ray irradiation, the pre-oxidation rate of PAN fiber can be obviously increased. Undergoing the changes in performance, the invention can help control the sharp rise in the temperature of a sample and accelerate the oxidation in the process for PAN fiber or films to carry out high-temperature cyclization or oxidation crosslinking, particularly, the process of precursor pre-oxidation crosslinking for preparing PAN-based carbon fiber. Accordingly, the method of the invention is of potential application value to the reduction in production cost for PAN oxidation products, particularly, the reduction in production cost for PAN-based carbon fiber.

Description

technical field [0001] The invention relates to a method for modifying polyacrylonitrile by gamma ray radiation, in particular to a method for modifying polyacrylonitrile fibers for producing carbon fibers. The method reduces the exothermic heat of polyacrylonitrile cyclization, and at the same time increases the preoxidation speed of polyacrylonitrile fibers or films. Background technique [0002] Polyacrylonitrile (PAN) products are widely used in people's production and life. Cyclized and crosslinked polyacrylonitrile products can be prepared by heating cyclization treatment or air heating oxidative crosslinking of polyacrylonitrile fibers or films. These products are high-quality flame retardant materials and derive a series of downstream products, the most important of which are is polyacrylonitrile-based carbon fiber. [0003] As we all know, carbon fiber has excellent performance and is widely used in cutting-edge fields such as aerospace, national defense and milit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/28C08L33/20D01F9/22D01F9/21D01F6/18D01F6/38C09K21/14
Inventor 王谋华吴国忠刘伟华
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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