The interface is the transition region between the fiber and the matrix, whose structure and characteristics determine the overall performance and sustained stability of carbon fiber/hydroxyapatite-epoxy (CHR) composites as bone implant materials. Similarly, carbon fibers, as reinforcement, also play an indispensable role in carrying external loads. Therefore, this work focuses on improving the fibers surface in a gentle and non-destructive way to ensure that the reinforcement of both the fibers and the interface is maximized, resulting in excellent mechanical and biotribological properties. In this work, a novel interface layer was designed by introducing zeolitic imidazolate framework-8 (ZIF-8) into CHR with a facile solvent method. The presence of ZIF-8 induces the formation of flower-cluster hydroxyapatite. The complex layer formed by the combination of the polyhedral shape ZIF-8 and the flower-cluster hydroxyapatite enhances the mechanical interlock and chemical interaction between the carbon fibers and the epoxy matrix. It also promotes the penetration and curing process of the epoxy matrix. The tensile strength of ZIF-8 reinforced CHR (ZIF-8@CHR) are 136.97 MPa, which is 38.43 % higher than that of the pristine CHR. And the wear rate (1.18 × 10−14 m3(N·m)−1) of ZIF-8@CHR is decreased by 81.65 %. ZIF-8@CHR with superior mechanical and biotribological properties provides new insights into the biological application of carbon fiber composites as an implant material for fracture fixation or reconstruction.

中文翻译：

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碳纤维/羟基磷灰石-环氧树脂复合材料ZIF-8界面层的无损构建策略


界面是纤维与基体之间的过渡区域，其结构和特性决定了碳纤维/羟基磷灰石-环氧树脂（CHR）复合材料作为骨植入材料的整体性能和持续稳定性。同样，碳纤维作为增强材料，在承载外部载荷方面也发挥着不可或缺的作用。因此，这项工作的重点是以温和且非破坏性的方式改善纤维表面，以确保纤维和界面的增强最大化，从而获得优异的机械和生物摩擦学性能。在这项工作中，通过使用简便的溶剂法将沸石咪唑酯骨架-8（ZIF-8）引入CHR中，设计了一种新型界面层。 ZIF-8 的存在会诱导花簇羟基磷灰石的形成。多面体ZIF-8和花簇羟基磷灰石结合形成的复合层增强了碳纤维和环氧基体之间的机械互锁和化学相互作用。它还促进环氧基体的渗透和固化过程。 ZIF-8增强CHR（ZIF-8@CHR）的拉伸强度为136.97 MPa，比原始CHR高38.43%。 ZIF-8@CHR的磨损率(1.18×10−14 m3(N·m)−1)降低了81.65%。 ZIF-8@CHR具有优异的机械和生物摩擦学性能，为碳纤维复合材料作为骨折固定或重建植入材料的生物应用提供了新的见解。