Construction Of Multi-scale Carbon Fiber Reinforcement By Biomonitalization And Study On The Properties Of Polyetheretherketone Composites

Nowadays,the fundamental reason for limiting the further improvement of the performance of carbon fiber reinforced resin matrix composites is that the interface performance between carbon fiber and matrix is weak,which leads to the direct failure of the interface when the composites are stressed.Constructing an interface region with excellent properties in the composite material can ensure that when the composite material is subjected to external stress,the stress can be efficiently transferred from the matrix to the fiber,which is of great significance for improving the mechanical properties of the carbon fiber composite material.In this paper,inspired by the phenomenon of natural biomineralization,silk fibroin(SF),levodopamine(L-DOPA)and polyethyleneimine(PEI)materials with low price,degradability and good biocompatibility were used as organic templates to induce the mineralization of inorganic mineral hydroxyapatite(HA).The "organic-inorganic" petal shaped and granular HA was constructed on the surface of carbon fiber(CF)by biomineralization to improve the interfacial properties of carbon fiber composites.The specific research contents of this paper are as follows:(1)Because the existing research-biomineralization induces HA for a long time(days or months),not only a waste of time,but also causes waste of resources and increases experimental costs.In order to improve the efficiency of mineralization-induced HA,the effect of cetyltrimethylammonium bromide on the rate of mineralization-induced HA in simulated body fluid was investigated.Furthermore,the "organic-inorganic" structure was successfully constructed on the surface of CF by in-situ growth,in order to enhance the interface of the composite.The CF before and after mineralization was characterized by XRD,FTIR,EDS,SEM and dynamic contact angle,which proved that the petal-like HA was successfully mineralized on the fiber surface.In addition,after the universal testing machine test,it was found that the mechanical properties of the CF-HA /PEEK composites prepared in this paper were effectively improved,and the interlaminar shear strength and flexural strength of the carbon fiber-hydroxyapatite/45/polyetheretherketone composites were 45.9% and 51.2% higher than those of the untreated carbon fiber / polyetheretherketone(UCF/PEEK)composites.Cell experiments proved that CF-HA has good biocompatibility.This method provides a direction for rapid mineralization of HA.(2)Inspired by the process of "bone mineralization",CF-HA multi-scale reinforcement was constructed by biomineralization method with simple equipment,easy operation,mild experimental conditions,environmental protection and economy.This method uses LDOPA/PEI as an organic template to induce mineralized HA.FTIR,dynamic contact angle,SEM and EDS were used to characterize the CF before and after mineralization,indicating that the granular HA was successfully constructed on the fiber surface.By adding sodium dodecyl sulfate(SDS)to the simulated body fluid,the problems of poor dispersion,serious agglomeration,and messy rod-like when using SDS as an organic template to induce mineralization of HA were solved.The mechanical properties test results show that the multiscale reinforcement has a significant effect on the mechanical properties of the composites.The CF-HA1:1/PEEK ternary composites have higher flexural strength and interlaminar shear strength than the untreated carbon fiber/PEEK binary composites,which are 47.4%and 56.7% higher than the UCF/PEEK composites,respectively.The biomineralization test(mineralized HA)showed that the composite material had good biological activity.The prepared composites are expected to be applied in the fields of tumor repair,orthopedic implant,oral implant and so on.