A method for preparing high-performance composite materials by in-situ growth of polymer particles on the surface of carbon fibers

Abstract

The invention discloses a method for preparing a high-performance composite material through in-situ growth of polymer particles on the surface of carbon fiber (CF). According to the method, at the room temperature, the polymer particles are subjected to in-situ chemical bonding and growth on the surface of the CF to modify the surface of the CF, thus the interfacial adhesion between the CF and abase material is improved, and the performance of the composite material is improved. According to the method, the particles subjected to in-situ growth on the surface of the CF are connected with theCF through chemical bonds and are not prone to falling off; the modification process of the surface of the CF is simple, fast and mild in condition; strong acid or strong oxidants are not used for treating the surface of the CF, and the surface of the CF is not damaged; the components, the size, the shape, the surface roughness and functional groups of the particles grown on the surface of the CFare adjustable; and by adjusting and controlling the reaction components and ratio, the surfaces of the polymer particles can carry the functional groups capable of further reacting with base material resin, and the interface performance between the CF and the base material is further improved. Through TFBT tests, it is shown that the interface tensile strength between the CF and the base material resin is improved by 76-164%, and through determining of a monofilament microdroplet debonding method, it is shown that interfacial shear strength (IFSS) is improved by 40-76%.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, in particular to a method for preparing high-performance composite materials by in-situ growth of polymer particles on the surface of carbon fibers. Background technique [0002] Due to its excellent specific strength, specific modulus, corrosion resistance, energy absorption and other characteristics, carbon fiber (CF) is widely used in aerospace, rail transit, automobile and other fields [Garima Mittal, Kyong Y.Rhee, Vesna David Hui. Reinforcements in multi-scale polymer composites: Processing, properties and applications [J]. Composites Part B, 2018, 138:122-139]. [0003] In the process of CF production, pre-oxidation, high-temperature carbonization and graphitization are required, which makes the surface of CF filaments chemically inert and has low surface free energy; when preparing composite materials as reinforcements, the compatibility of CF and the matrix of comp...

AI Technical Summary

Problems solved by technology

[0012] The above-mentioned method of modifying the surface of CF and increasing the surface roughness of CF, thereby improving the interfacial adhesion between CF and the substrate, often uses strong acid or strong oxidation to treat CF, which is easy to form defects on the surface of CF and reduce the tensile strength of CF itself.

In addition, most of the above modification methods need to go through multiple steps, and the reaction conditions of each step are harsh, such as high temperature and oxygen removal environment, long reaction time (several hours), etc.

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