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This invention discloses a graphite mesh skeleton copper-based composite material and its preparation method, belonging to the field of thermal management materials. The composite material includes a vertical graphite mesh skeleton, copper pillar supports in the center of each mesh unit, and copper-based filler phases filling the gaps. The high thermal conductivity direction of the graphite surface is aligned with the material thickness direction, and its sidewalls have micropores. After sintering, the copper-based filler phases pass through the micropores, causing the copper in adjacent meshes to fuse together to form a three-dimensional through-network. The preparation method includes graphite cutting and drilling, skeleton assembly, introduction of copper pillars and copper powder filling, and sintering densification. This invention suppresses the collapse of vertical graphite during sintering through the central copper pillars and breaks the physical separation of the matrix through the physical riveting effect of the micropores, significantly improving interfacial bonding and macroscopic mechanical strength, while maintaining excellent out-of-plane continuous directional thermal conductivity.

The application discloses an antibacterial bio-based polyamide elastomer and a preparation method thereof. The preparation method comprises the following steps: preparing a polyamide prepolymer containing a tertiary amine structure through ring-opening polymerization reaction of caprolactam, N-diethyl-aminocaprolactam and sebacic acid, then reacting with polytetramethylene ether glycol to form a polyamide-polyether block copolymer elastomer, and further modifying the polyamide-polyether block copolymer elastomer through reaction with a halogenated hydrocarbon to realize quaternary ammonium modification, so that the quaternary ammonium salt antibacterial group is stably introduced into the polymer molecular structure in a covalent manner. The bio-based polyamide elastomer prepared by the application has excellent elastic properties and persistent and stable quaternary ammonium antibacterial properties, the antibacterial components are not easy to migrate and lose, the preparation process is simple and controllable, is suitable for the field of functional materials, and has a good application prospect.