Tough stretchable compressible polymer/graphene oxide nano composite hydrogel with excellent self-repairing performance

Abstract

The invention provides tough stretchable compressible polymer / graphene oxide nano composite hydrogel and the tough stretchable compressible polymer / graphene oxide nano composite hydrogel has excellentself-repairing performance. Under the existence of graphene oxide, by free radical polymerization of acrylamide (AM) and acryloyloxyethyl trimethyl ammonium chloride (DAC), the cationic polyacrylamide / graphene oxide (GO) hydrogel is prepared. Mechanical performance and self-repairing capacity can be regulated by content of GO and a mass ratio of the AM to the DAC. An ionic bond between the DAC and the GO and a hydrogen bond between the AM and the GO can effectively dissipate energy and reconstruct a network. The obtained composite hydrogel has high rigidity (Young modulus: to 1.1MPa), high toughness (to 9.3MJm<-3>) and high fatigue resistance, and a high self-repairing rate (tensile strength of over 92%, tensile strain of over 99% and toughness of over 93%). The tough stretchable compressible polymer / graphene oxide nano composite hydrogel are simple in step, convenient to operate and high in practicality.

Description

technical field [0001] The invention belongs to the field of self-repairing hydrogels, in particular to tough, stretchable and compressible polymer / graphene oxide nanocomposite hydrogels with excellent self-repairing performance. Background technique [0002] Recently, self-healing materials have received increasing attention due to their ability to repair themselves after damage, as this property can extend the life of the material, reduce maintenance costs, and improve the overall safety of the system. There are three strategies to achieve self-healing materials, including the storage of repairing agents, dynamic covalent bond formation, and the use of non-covalent interactions (e.g., hydrogen bonds, hydrophobic associations, host-guest interactions, π-π stacking, and electrostatic interactions). Hydrogels, as soft three-dimensional mesh materials, can not only be used in bioengineering because of their biocompatibility, but also have potential applications in waste treat...

AI Technical Summary

Problems solved by technology

Although great progress has been made, most regenerative hydrogels recover less than 0.5 MPa tensile strength and less than 90% self-healing efficiency after repair.

Therefore, it remains a great challenge to design and synthesize novel self-healing materials with enhanced mechanical properties without sacrificing their repair efficiency.

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