PPE

self repairing materials of intelligent textile materials

1n the mid-1980s, people hope to find intelligent material system, which integrates sensing, driving and information processing. With the new development of textile science and technology in the 21st century, “smart”, “smart” and “smart” fiber materials can be made to produce intelligent textiles; Or the conventional fabric as a “platform”, adding a variety of new chemical raw materials to produce intelligent textiles. The concept of intelligent fiber comes from bionics, which generally achieves the functions of self-healing, self-adjusting, self diagnosis, self adaptation and self recovery from bionics, molecular design and composite technology

among them, polymer matrix composites with self-healing function have become the research hotspot in recent years. At present, the development and research in this field has become a hot spot in the scientific community. As a new type of intelligent material, self-healing polymer matrix composites imitate the mechanism of biological damage self-healing, and self repair micro cracks which are difficult to find by naked eyes in the process of material processing or use

self repair methods of polymer matrix composites mainly include intrinsic self repair and external self repair. The difference between the two is whether the self-healing system needs additional repair agent. The self-healing function of external self-healing materials is realized by adding repair agents inside and outside the material system. This paper focuses on the introduction of external self-healing materials

hollow fiber self repairing material

the repair mechanism of hollow fiber self repairing method is that the hollow fiber is embedded in the matrix material, and the hollow fiber is filled with repair fluid. When the material is damaged, the damage area can be self repaired by releasing the repair fluid in the hollow fiber and bonding the crack< 1n recent years, many researchers have applied it to the self-healing field of polymer matrix composites. The diameter of hollow fiber is generally 40-200 μ m. According to the type of fiber internal repair agent, it can be divided into three types: the middle hollow fiber contains a single component repair agent, which can realize self repair without curing agent under the action of air, etc; The repairing agent and curing agent are injected into different hollow fibers respectively, and the self repairing process can only be realized by contacting the repairing agent and curing agent; When the restorative agent is injected into the hollow fiber, the curing agent is dispersed in the matrix material in the form of microcapsules, which also needs to be contacted to realize self-healing function nano particles self repairing materials the self repairing mechanism of nano particles is: when cracks appear in the materials, nano particles diffuse to the crack area (the smaller the size of nano particles, the better the diffusion effect), and the nano particles after diffusion fill the cracks to repair< Microcapsule self-healing polymer material was first proposed in 2001, and has become a research hotspot of researchers in the next decade, and has become one of the most important self-healing methods. The self-healing mechanism is: the microcapsule containing the repair agent is embedded in the polymer matrix material, and the catalyst is embedded in the matrix (or the catalyst can be microencapsulated and embedded in the matrix material). After the material cracks, the crack propagation leads to the rupture of the microcapsule, and the released repair agent diffuses to the damage area under the siphon effect, After encountering catalyst, polymerization reaction occurs to repair cracks self repairing material of microvascular although the self repairing system of microcapsule is the most widely used, it can only achieve a single repair, and there is still a gap compared with the ideal self repairing material. 1n contrast, the self-healing system of microvascular network, which was first realized in 2007, can realize the continuous supplement of repair agent by simulating the self-healing principle of biological tissue and embedding microvascular with three-dimensional network structure in the material, so it can realize the multiple repair of material damage< The repair mechanism of carbon nanotubes is: carbon nanotubes embedded in the matrix material are used as containers, and the repair agent molecules are stored in them. When the material cracks, the carbon nanotubes break, After the release of the repair agent, it adsorbs on the crack or chemical reaction occurs at the crack to realize the self-healing function. Carbon nanotube self-healing system is an ideal self-healing material system, but it is only in the stage of computer simulation, there is no real experimental research, and it is expected to be well applied in the future self repairing polymer materials are currently in the research stage of rapid development and belong to the interdisciplinary research field, so researchers with various knowledge backgrounds are needed to join. The future development trend is as follows: 1) optimize and develop new self-healing system to improve the repair efficiency and self-healing cycle times2. The realization of self repairing function does not affect the properties of the matrix material; 3. The self-healing polymer material has the function of self diagnosis at the same time, which makes the self-healing polymer material realize the real biomimetic material; 4. From laboratory research to engineering application the development of intelligent materials has laid a solid foundation for the development of intelligent textiles and promoted the development of high-end textile industry. By applying intelligent materials to textiles or making textiles intelligent, we make traditional textiles open up new buds

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