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Surface modified method for high strength and high modulus polyimide fiber and application thereof

A technology of high-modulus polyimide fiber and high-modulus polyimide, applied in fiber treatment, fiber type, physical treatment, etc., to achieve obvious effects, improve wetting performance, and improve interface performance

Active Publication Date: 2014-08-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there is no commercialized high-strength and high-modulus polyimide fiber at present, there are few reports on its surface modification at home and abroad.

Method used

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  • Surface modified method for high strength and high modulus polyimide fiber and application thereof
  • Surface modified method for high strength and high modulus polyimide fiber and application thereof
  • Surface modified method for high strength and high modulus polyimide fiber and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Place the polyimide fiber in the plasma chamber, use a vacuum pump to pump the air pressure of the chamber below 5Pa, feed oxygen at a flow rate of 30SCCM, keep the discharge pressure in the chamber at 30Pa, and treat it at a discharge power of 200W for 10min. The treated fiber was tested for dynamic contact angle and the surface energy value was calculated. At the same time, fiber was used as reinforcement and composited with epoxy resin to prepare a composite material and its interlaminar shear strength was tested. The volume fraction of fiber was 50%.

Embodiment 2

[0029] Put the polyimide fiber in the plasma chamber, use a vacuum pump to pump the air pressure of the chamber to below 5Pa, feed helium gas at a flow rate of 150SCCM, keep the discharge pressure in the chamber at 40Pa, and treat it at a discharge power of 200W for 10min . The treated fiber was tested for dynamic contact angle and the surface energy value was calculated. At the same time, fiber was used as reinforcement and composited with epoxy resin to prepare a composite material and its interlaminar shear strength was tested. The volume fraction of fiber was 50%.

Embodiment 3

[0031] Put the polyimide fiber in the plasma chamber, use a vacuum pump to pump the air pressure of the chamber to below 5Pa, pass in argon gas at a flow rate of 200SCCM, keep the discharge pressure in the chamber at 50Pa, and treat it at a discharge power of 150W for 7min . The treated fiber was tested for dynamic contact angle and the surface energy value was calculated. At the same time, fiber was used as reinforcement and composited with epoxy resin to prepare a composite material and its interlaminar shear strength was tested. The volume fraction of fiber was 51%.

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Abstract

The invention provides a surface modified method for a high strength and high modulus polyimide fiber and application thereof, and belongs to the field of fiber surface modification and application thereof. The method comprises the following step: the high strength and high modulus polyimide fiber is exposed into plasma for modification, wherein the plasma is generated in process gas under effect of a radio frequency inductive coupling device, and the process gas comprises at least one from oxygen, nitrogen, argon gas and helium. According to the surface modified method for the high strength and high modulus polyimide fiber, under the circumstance that the decline of mechanical strength of the fiber is less than 5 % , the soaking performance of the fiber is effectively improved, and the surface free energy of the fiber is increased by 20% - 70%; modified fiber can be applicable to preparing a composite material with epoxy resin; compared with composite materials prepared by untreated fibers, the interlayer shearing strength of the composite material is increased by 5-40%.

Description

technical field [0001] The invention belongs to the technical field of high-performance fiber surface modification and its application, and in particular relates to a method for plasma modification of the surface of high-strength and high-modulus polyimide fibers and its application in preparing composite materials. Background technique [0002] With the rapid development of science and technology, cutting-edge fields such as aerospace, military industry and national defense have put forward higher and higher requirements for the performance of materials, and traditional single materials can no longer meet their needs. In this context, high-performance fiber-reinforced resin composites have developed rapidly due to their advantages such as high strength, low density, low dielectric, corrosion resistance, high temperature resistance, and low temperature resistance. [0003] At present, the high-performance fibers commonly used as composite material reinforcement mainly includ...

Claims

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Application Information

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IPC IPC(8): D06M10/00C08L63/00C08L79/08C08J5/06D06M101/30
Inventor 武德珍孙旭阳牛鸿庆刘威威田国峰齐胜利
Owner BEIJING UNIV OF CHEM TECH
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