Nano-sized microcapsules, polymer-based self-healing composite material and preparation method

Abstract

The invention discloses nano-sized microcapsules, a polymer-based self-healing composite material and a preparation method, and belongs to the technical fields of preparation of functional materials and high performance of composite materials. The microcapsules are prepared by the steps of: mixing styrene, oleic acid and deionized water, adding potassium persulfate, and raising the temperature toobtain polystyrene balls; mixing the obtained polystyrene balls with deionized water, adding an evenly mixed solution of phenol, hexamethylenetetramine and deionized water, and raising the temperatureto obtain phenolic resin-coated polystyrene balls; adding toluene, adding a silane coupling agent after stirring, raising the temperature, and performing stirring to obtain surface-modified hollow phenolic resin balls; adding toluene, performing stirring, removing the excess toluene solution, performing mixing with dicyclopentadiene, raising the temperature, and performing stirring to obtain thephenolic resin-coated healing-agent dicyclopentadienethe self-healing capsules. Morphology characteristics, size, wall thickness and the like of the capsules can be controlled well through the preparation method; by adding the self-healing microcapsules into an epoxy resin matrix, not only can a toughening effect on the material be produced, but also an self-healing function can be achieved.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials and high performance of composite materials, and in particular relates to a preparation method of nanoscale microcapsules for polymer-based self-healing composite materials. Background technique [0002] Polymer composite materials are used more and more widely in the aerospace field, but under the influence of the surrounding environment and the use process, it is inevitable that there will be micro-cracks inside. The appearance and propagation of microcracks will degrade the material structure and performance, and affect its service life. However, the cracks of polymers are usually hidden deep inside, and because of technical limitations, small damages such as microcracks on many substrates are usually not easy to detect, posing a major safety hazard. In response to this problem, inspired by the self-healing function of organisms, the concept of self-healing material...

AI Technical Summary

Problems solved by technology

However, most of the existing self-healing microcapsule preparation methods are in-situ polymerization and interfacial polymerization, and the capsule size is large (the particle size is mostly greater than 1 μm, ranging from 1 to 500 μm), showing poor capsule morphology and wall thickness. control, and affect self-healing efficiency

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