Recently, Prof. Cheng Qunfeng from the Beijing University of Aeronautics and Astronautics and the team of Ray Bowman of the University of Texas at Dallas jointly adopted a room temperature π-π conjugate bond and a covalent bond order cross-linking strategy to construct a super strong, super tough, high Conductive multifunctional graphene composite film. This low-cost, low-temperature, high-performance multi-functional graphene nanocomposite has broad application prospects in aerospace, automotive, flexible electronic devices and other fields, and is expected to replace the widely used carbon fiber composite materials.
It is understood that lightweight and high-strength carbon fiber composite materials have a wide range of applications in daily life, especially in the fields of aviation, aerospace, automobiles and sports equipment.
However, there are many disadvantages in the preparation and use of carbon fiber composite materials: synthetic carbon fiber requires high temperature (more than 2500 degrees Celsius) graphitization, and the cost is high; due to the weak interfacial action, delamination between carbon fiber and polymer matrix is easy; carbon fiber The electrical properties of composite materials are low and cannot meet the needs of special applications.
The new material can be prepared at room temperature below 45 degrees Celsius, the strength is comparable to carbon fiber composite material, the cost is lower, and it is easy to achieve commercial scale preparation. In addition, the tensile strength of the film material is 4.5 times that of the ordinary graphene film, and the toughness is 7.9 times that of the latter.
Preparation and Characterization of Ordered Crosslinked Graphene Films
Cheng Qunfeng introduced that the in-situ Raman characterization reveals the tough mechanism of cross-linking of π-π conjugated bonds and covalently bonded interfaces from the molecular scale, which provides important for the preparation of high performance graphene nanocomposites. Theoretical guidance. At the same time, the small molecularly ordered crosslinked graphene composite film also has high electrical conductivity, high electromagnetic shielding performance, and excellent corrosion resistance and fatigue resistance.
