Construction of bimetallic MOFs structures on surface of high modulus carbon fibers
The carbon fiber obtained by high-temperature heat treatment has a highly inert surface structure,which leads to poor wettability between the carbon fiber and the matrix.In order to improve the interface properties between carbon fiber and the matrix,this study used cathodic electrodeposition to in-situ grow metal-organic framework(MOF)materials with two different metal elements on the surface of high modulus carbon fiber.The introduction mechanism,morphology and their effects on performance of the bimetallic MOFs were investigated.The results show that the bimetallic MOF material exhibits a certain orientation and spherical shape,which evolves into a loose and porous structure after annealing.This structure significantly improves the surface roughness and interface adhesion of high modulus carbon fiber.The nucleation and growth of bimetallic MOFs depend on the metal reducibility,higher metal reducibility leading to faster growth rates and higher deposition amounts of MOFs.The introduction of bimetallic MOFs reduces the fiber resistivity to 0.05 Ω∙·cm,thereby enhancing the conductivity.The unique three-dimensional porous structure also endows the high modulus carbon fiber with excellent thermal stability in high-temperature environments.
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