Improvement of Interfacial Properties and Bioactivity of CF/PEEK Composites by Rapid Biomineralization of Hydroxyapatite

The carbon fiber/hydroxyapatite (CF/HA) rein-forcement with a three-dimensional flower-like structure was rapidly fabricated with the biomimetic mineralization method to strengthen the interfacial performance and bioactivity of carbon fiber/polyether ether ketone (CF/PEEK) composites. Silk fibroin (SF), which can construct a robust interphase between CF and PEEK, supported an organic template to regulate the growth of inorganic HA. The interfacial properties were markedly enhanced through mechanical interlocking and interface adhesion induced by increasing roughness and surface energy of CF. Besides, the mineralization time was significantly reduced after the addition of cetyltrimethylammonium bromide to the simulated body fluid, and the prepared CF/HA possessed good bioactivity. In this study, the interlaminar shear strength (ILSS) and flexural strength of CF-HA/45/PEEK composites demonstrated an enhancement of 45.9% and 51.2%, respectively, compared to the untreated CF/PEEK composites. It is predicted that this strategy could provide a rapid and convenient route to ameliorate the interfacial performance and bioactivity of CF/PEEK composites simultaneously.