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Polyamide nanofiber toughened self-healing carbon fiber/epoxy resin-based composite material and preparation method thereof

An epoxy resin matrix and nanofiber technology, applied in the field of functional material preparation, can solve the problems of composite materials that are difficult to repair for one-time use, weak nanofiber-epoxy interface bonding, and difficult to rebond and repair the fractured surface, etc., to achieve The effect of tight bonding between layers, improving service life and repairing damage

Pending Publication Date: 2022-05-31
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the nanofibers prepared in the current research are only physically combined with the epoxy resin matrix, and the epoxy matrix has not been toughened at the molecular level, and the nanofiber-epoxy interface is weak.
In addition, the highly cross-linked molecular chains of the resin matrix are prone to brittle fracture.
Once the composite material is delaminated, it is difficult to rebond and repair the fractured surface. The limitation of this inherent property makes the nanofiber toughening technology not fundamentally solve the shortcomings of composite materials, which are disposable and difficult to repair.

Method used

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  • Polyamide nanofiber toughened self-healing carbon fiber/epoxy resin-based composite material and preparation method thereof
  • Polyamide nanofiber toughened self-healing carbon fiber/epoxy resin-based composite material and preparation method thereof
  • Polyamide nanofiber toughened self-healing carbon fiber/epoxy resin-based composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] 1. Preparation of thermoplastic polyamide nanofiber membrane

[0050] Weigh thermoplastic polyamide polymer (this thermoplastic polyamide polymer contains large molecular weight (14000-18000) polyamide PAxwa116 77wt%, initial melting temperature is 110 ℃; contains small molecular weight (600~1100) polyamide PA65023wt%) 5.2 g was dissolved in 14.8 g of acetic acid solvent, and stirred magnetically for 24 h at room temperature to obtain a 26 wt % polyamide solution. Then add the polyamide spinning solution into the micro-injection pump, the liquid rate is constant at 0.6ml / h, the ambient temperature is controlled at 20-30°C, the ambient humidity is controlled at 50%, and the applied voltage is +15 / -3KV for electrospinning Silk to prepare thermoplastic polyamide nanofibers 1. Among them, the thermoplastic polyamide polymer remains in a molten state above the initial melting temperature (110°C); at 130°C, its viscosity is lower than 2000Pa·s and can flow, so 130°C is used ...

Embodiment 2

[0063] The deposition time of thermoplastic polyamide nanofibers was controlled to 120 minutes, and finally a thermoplastic polyamide nanofiber carbon fiber unidirectional cloth with a thickness of 28-32 μm was uniformly deposited on the surface, and the rest were the same as in Example 1.

Embodiment 3

[0065] The deposition time of thermoplastic polyamide nanofibers was controlled to be 180 minutes, and finally a thermoplastic polyamide nanofiber carbon fiber unidirectional cloth with a thickness of 43-47 μm was uniformly deposited on the surface, and the rest were the same as in Example 1.

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Abstract

The invention discloses a polyamide nanofiber reinforced and toughened self-healing carbon fiber / epoxy resin based composite material and a preparation method thereof. The composite material comprises an epoxy resin matrix and a plurality of layers of carbon fiber fabrics arranged in the epoxy resin matrix, wherein thermoplastic polyamide nanofiber membrane layers are partially or completely arranged among the carbon fiber fabrics; wherein the polyamide nanofiber is prepared through electrostatic spinning and is a mixture of large molecular weight and small molecular weight. The preparation method comprises the following steps: preparing the thermoplastic polyamide nanofibers through electrostatic spinning, compounding the thermoplastic polyamide nanofibers with the carbon fiber fabric to obtain the carbon fiber fabric with the polyamide nanofibers attached to the surface, laying layers, laying blank carbon fiber fabric on the uppermost layer, and carrying out epoxy resin infiltration and curing before, during or after laying layers. The composite material has stronger interface toughening and self-healing functions, interlayer damage of the composite material can be repaired, the service life of the composite material is effectively prolonged, the preparation process is simple, and the composite material has wide industrial application prospects.

Description

technical field [0001] The invention belongs to the field of preparation of functional materials, in particular to a thermoplastic polyamide nanofiber reinforced and toughened self-healing carbon fiber / epoxy resin-based composite material and a preparation method thereof. Background technique [0002] Fiber-reinforced epoxy-based composites, as a lightweight, high-stiffness, high-strength structural material, have been widely used in advanced engineering. Due to the special laminate structure, brittle resin-rich regions exist between adjacent fiber-reinforced layers. However, the highly cross-linked network structure of epoxy resin and the laminated structure of reinforcing fibers make the composite material's ability to resist the load in the thickness direction weak, easy to cause interlayer damage and difficult to repair. Further propagation of microcracks and delamination will lead to overall failure of the structural composite. Therefore, improving the fracture toughn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08L77/00C08L77/02C08L77/06C08K7/06C08J5/04
CPCC08J5/047C08J5/046C08J5/042C08J2363/00C08J2477/00C08J2477/02C08J2477/06C08K7/06
Inventor 蔡浩鹏陈博学毛驰甘雨
Owner WUHAN UNIV OF TECH