Introduction:

With the widespread application of electronic communication technology in various fields, the resulting electromagnetic waves have aggravated electromagnetic radiation pollution, which not only directly affects the normal operation of high-precision sensitive electronic equipment, but also endangers human health and safety. Two-dimensional layered transition metal carbides, nitrides or carbonitrides (MXene) have outstanding electrical conductivity, corrosion resistance and chemical activity, and show great application prospects in the field of electromagnetic shielding. A comprehensive review of the research progress in the field of MXene/polymer electromagnetic shielding is helpful to promote the in-depth understanding of MXene by researchers and promote the further breakthrough and development of MXene and its MXene/polymer electromagnetic shielding materials.



Recently, the structural/functional polymer composites (SFPC) research team of Professor Gu Junwei from the School of Chemistry and Chemical Engineering of Northwestern Polytechnical University published a titled "MXenes For Polymer Matrix Electromagnetic Interference Shielding Composites" in Elseviers Journal Composites Communications (2019IF=4.915). : A Review" review paper. This review introduces the types and basic properties of MXene and its precursor MAX, summarizes the effects of different precursor MAX and preparation methods on the chemical properties, structure and performance of MXene, and focuses on the preparation methods and preparation methods of MXene/polymer electromagnetic shielding materials. The latest research progress puts forward the key scientific and technical problems to be solved urgently in MXene and its MXene/polymer electromagnetic shielding materials, and looks forward to the development trend of MXene and its MXene/polymer electromagnetic shielding materials.




Conclusion and Outlook

This article reviews the properties and preparation methods of MXene, as well as the preparation methods and latest research progress of MXene/polymer electromagnetic shielding composites. However, at the present stage, the cost of MAX phase and MXene is relatively high, and the preparation process is more complicated. Therefore, reducing the cost of MAX phase and MXene and developing a new preparation process is the only way to realize low-cost industrial production of MXene. At the same time, the functional groups on the surface of MXene are not conducive to the full display of its conductive properties. High temperature treatment with inert gas or reducing gas can effectively remove -F, -OH and other functional groups, but it will cause the oxidation of MXene, so the development does not contain the surface The functional group of MXene is one of the key research directions in the future.



In addition, the physical blending method to prepare MXene/polymer electromagnetic shielding composites is simple and has wide applicability, but usually requires a higher filling amount of MXene to build an effective MXene conductive network, which inevitably affects MXene/polymer electromagnetic shielding composites. The mechanical properties, processing performance and cost of the material are affected; the freeze-drying method can build a complete three-dimensional conductive network of MXene while maintaining its three-dimensional porous structure, effectively reducing the conductive percolation value of MXene, but higher porosity will accelerate the MXene Oxidation; the pre-support molding method isolates MXene from the air by backfilling the polymer matrix, effectively improving the oxidation resistance of MXene, but there is no chemical interaction between the polymer matrix and MXene, which makes its mechanical properties poor; vacuum assisted suction filtration can be formed Uniform MXene conductive network, but the polymer matrix and MXene are mostly cross-linked by hydrogen bonds, and their binding force is relatively weak, and the mechanical properties need to be further improved; multi-layer alternating suction filtration gives MXene/polymer due to the mechanical framework effect of the polymer layer The electromagnetic shielding composite film has excellent mechanical properties, but the multilayer structure is usually difficult to form a through MXene conductive network. In order to give full play to the highly conductive properties of MXene, reasonable and efficient structural design and the development of new preparation methods are necessary and essential for the preparation of the next generation of high-performance MXene/polymer electromagnetic shielding composite materials. With the continuous advancement of science and technology, the research system, preparation methods and comprehensive properties of MXene and its MXene/polymer electromagnetic shielding composite materials will continue to be improved.