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    Modification and Application of Hexagonal Boron Nitride
    Hits:   Date:2020-05-13  
    Hexagonal boron nitride (hBN), known as "white graphene", has excellent physical and chemical properties, such as resistance to strong acids and alkalis, oxidation resistance, high temperature resistance, high hot melt and mechanical strength, lubricity and Wide band gap etc. Because of these characteristics, it has been widely used in aerospace, catalyst carriers, electronic packaging and catheters.
    However, there is still a big problem for these applications, that is, multilayer hexagonal nitrogen. This article mainly studies the effect of different ultrasonic methods and solvents on the replacement effect of hBN, and uses ball milling to replace and modify hexagonal nitrogen. Boron, and the hexagonal boron nitride aerogel was prepared by hydrothermal method, and then the hexagonal boron nitride aerogel and polydimethylsiloxane composite were formed to form a polymer composite material with high heating rate, specific experiment The contents are as follows:
    (1) Replacement of hBN by micro-substitution method, and study the influence of micro-substitution method parameters (including ultrasonic mode, solvent type, etc.) on the replacement effect, and can replace hBN with a most convenient method. By first-level analysis, AFM, Raman, FTIR, etc., the substituted few layers of hBN nanosheets were analyzed to illustrate the polar conversion into solvents, the substitution of surfactants, and the basicity of Lewis bases.
    (2) The ball milling method was used to modify hBN, and the influence of ball milling parameters (including ball milling agent, ball milling method, etc.) on the modification effect was studied, which was explained by FTIR and XPS.
    (3) The hydrothermal method and freeze-drying-6-aminocaproic acid are used as the ball milling agent for wet grinding. The modification effect is the best, and Raman, orientation analysis, AFM, XRD, etc. prove that the ball milling method can separate and modify hBN Method to prepare hexagonal boron nitride aerogels. The effects of hydrothermal parameters (including hydrothermal temperature, hydrothermal time, crosslinking agent and hBN concentration, etc.) on the performance of hBN aerogels were studied. Combined agent, the aerogel obtained by hydrothermal at 80 ℃ for 24h is the best, and it is compounded with PDMS to prepare a composite material with high transmittance.
    The structure and performance of the aerogel are explained by SEM and optical photographs, the hBN aerogel can be improved by high temperature testing, and the mechanical properties of the composite are explained by the compression elasticity measurement.