Method for synergistically toughening carbon fiber epoxy compound material by means of porous nanofiber membrane
A nanofiber membrane and composite material technology, applied in the field of nylon 66/carbon nanotube porous nanofiber membrane synergistically toughened carbon fiber epoxy composite materials, can solve problems such as degumming, cracking, and delamination of composite materials, and achieve delamination suppression , improve permeability, simple operation
Pending Publication Date: 2020-02-07
DALIAN POLYTECHNIC UNIVERSITY
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[0004] Aiming at the toughening requirements of carbon fiber epoxy composite materials, the present invention aims to provide a synergistically toughened carbon fiber epoxy composite material with porous nanofiber membranes, so as to solve the problems of delamination, degumming, and cracking of composite materials, while reducing costs and preventing in-plane performance loss
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Embodiment 1
[0034] 1. Preparation of electrospun PA66 nanofiber membrane
[0035] 3 g of PA66 pellets were dissolved in 25 ml of formic acid and methylene chloride at a ratio of 3:2 w / w, and stirred for 4 hours to obtain a PA66 solution with a concentration of 12 wt%. Subsequently, the PA66 solution was placed in a syringe, and PA66 nanofibers with a radius of 100 nm were electrospun onto an aluminum foil collector at a flow rate of 1 ml / h and a voltage of 25 kV. After 15 hours, PA66 nanofiber membranes were collected from the collector.
[0036] 2. Preparation of carboxylated CNTs
[0037] Add 3 g of CNTs to 140 ml of H at a volume ratio of 3:1 2 SO 4 and HNO 3 In the mixed acid solution, stir evenly, condense and reflux in a constant temperature water bath at 80°C for 8 hours, add deionized water to dilute to neutral after the resulting mixed solution is cooled to room temperature, and finally put it in a 60°C oven for 24 hours to obtain carboxylated CNTs. The product is characteriz...
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Abstract
The invention discloses a method for synergistically toughening a carbon fiber epoxy compound material by means of a porous nanofiber membrane. The method comprises the following steps: (1) producinga nylon 66 nanofiber membrane by means of an electrostatic spinning machine technology; (2) conducting acidizing treatment on carbon nanotubes to obtain carboxylic carbon nanotubes; (3) placing the carboxylic carbon nanotubes in deionized water for ultrasonic treatment to make the carboxylic carbon nanotubes evenly dispersed; (4) placing the nylon 66 nanofiber membrane in an even carboxylic carbonnanotube solution for ultrasonic treatment to obtain the nylon 66 / carbon nanotube porous nanofiber membrane; and (5) smearing epoxy resin on a carbon fiber cloth, meanwhile, placing the nylon 66 / carbon nanotube porous nanofiber membrane on a middle layer, and conducting curing to obtain a carbon fiber epoxy compound material laminated board. According to the nylon 66 / carbon nanotube porous nanofiber membrane produced through the method for synergistically toughening the carbon fiber epoxy compound material by means of the porous nanofiber membrane, not only is the cost reduced, but also interlayer toughening of the compound material is achieved with an original form of the compound material maintained, so that the interlayer fracture toughness of the compound material is improved.
Description
technical field [0001] The invention belongs to the technical field of toughening and strengthening of composite materials, and in particular relates to a method for synergistically toughening carbon fiber epoxy composite materials with nylon 66 (PA66) / carbon nanotube (CNTs) porous nanofiber membranes. Background technique [0002] Carbon fiber / epoxy composites have been widely used in aerospace and other fields due to their light weight, excellent mechanical properties, and thermal stability. However, the highly cross-linked network structure of epoxy resin and the weak ability of layered carbon fiber / epoxy composites to resist the load in the thickness direction make this composite material prone to "delamination", that is, debonding or cracking between layers, which severely limits The application of this high-performance composite material in the field of engineering. Therefore, how to effectively suppress the delamination damage of composite materials and improve the i...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B32B9/00B32B9/04B32B3/24B32B27/32B32B27/12B32B33/00B32B37/10B32B37/06B32B37/00D01F6/60D06M11/74D06M101/34D01D5/00D04H1/4334D04H1/728D06B13/00
CPCB32B5/02B32B5/26B32B9/047B32B9/045B32B3/266B32B27/322B32B27/12B32B33/00B32B37/10B32B37/06B32B37/003D01F6/60D06M11/74D04H1/4334D04H1/728D01D5/003D01D5/0092D06B13/00D06M2101/34B32B2262/106B32B2255/02B32B2255/26
Inventor 董晓丽宋洋郑楠王宇马红超张秀芳
Owner DALIAN POLYTECHNIC UNIVERSITY
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