Recently, the reporter learned from Tianjin University that a new type of supramolecular polymer hydrogel with high strength, stability and thermoplasticity and self-healing has been successfully prepared, its strength has reached 4 times that of human cartilage, and its water content is as high as 70. In the case of %-80%, both tensile and compressive strengths reach megapascals, tear resistance, excellent stability in acidic and alkaline environments, and are expected to be used as soft-wet structural organisms. Material substitutes.
Hydrogel is a kind of jelly-like substance that contains a large amount of water between polymer material gaps. It can be used to make edible jelly, contact lenses, and artificial cartilage. It has a cross-linked structure, insoluble, does not melt, water content is 50% -70% of the total mass, similar to human tissue, so as a human implant can reduce adverse reactions, is an excellent biomedical material. However, hydrogels are relatively fragile and have poor stability and cannot completely replace the human soft tissues subjected to load. Therefore, it is necessary to prepare high-strength supramolecular polymer hydrogels.
The commonly used hydrogel consists of several components and it is necessary to add a chemical cross-linking agent to maintain its stable properties, high strength and insolubility in water. Professor Liu Wenguang of the School of Materials Science and Engineering of Tianjin University used the amino acid derivative as a single component, pioneered the concept of "double hydrogen bond supramolecule hydrogel" in the world, applied a hydrogen bonding self-recognition mechanism, and produced a new type of chemical without the use of a chemical crosslinking agent. Supramolecular hydrogels make it more excellent in biocompatibility and are expected to be used as a substitute for soft and wet structural biomaterials.
The experimental results show that this new supramolecular hydrogel also has thermoplasticity and self-repairing capabilities. After heating, it can be deformed, reshaped, shaped like plasticine, and reused. Such self-healing supramolecular polymer hydrogels with mechanically up to megapascal levels have rarely been reported before. (Correspondent Zhu Baolin reporter Feng Guojun)
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