| Bionics has become the most important source of innovation for researchers to develop new materials,propose new ideas and solve engineering technical problems.The human joint can according to the human activities to produce extremely complex functions,the soft and hard interface performance is important for maintaining the normal operation of the joint function.Hydrogels have a unique high water content with three-dimensional network structure.It is ideal material for the manufacture of functional biomaterials.Polyetheretherketone(PEEK)has excellent mechanical properties and biomechanical compatibility.It has become one of the research hotspots of artificial joint materials.Based on the biomimetic strategy,this paper prepares multi-layered bionic joint structural materials used the bottom up method.The surface composition and structure of the inert PEEK polymer were activated by a simple sulfonation treatment process to construct a loose porous bionic trabecular bone structure.On this basis,the UV-induced surface self-initiated graft polymerization technology was used to graft and cure the cross-linked interpenetrating network gel structure on PEEK surface.The reversible physical cross-linking hydrogel molding process of polyvinyl alcohol(PVA)achieves a firm connection between the PVA and the UV-cured gel.The microstructure and composition of the biomimetic joints were characterized by SEM and spectrometer.The three-layer biomimetic joint material interface was prepared by the adhesive lap shear strength and the interface peel strength test between the elastomer and the adherend.The performance was tested and the effect of the colloidal emulsion distribution ratio on the interfacial strength of the bionic joint material was systematically studied.1.Through the study of the complex and precise multi-scale structure of human joints,the useful information for the preparation of bionic joints is extracted.From the perspective of structural bionics and material bionics,a multi-layer gradient composite material combining soft and hard interfaces is designed to make it have impact resistance,low friction kinematics properties,and a theoretical model of bionic shutdown structure is constructed.2.The surface of the PEEK is sulfonated by a simple method of wet chemistry.ATR-IR and contact angle analysis showed that the hydrophilic sulfonic acid group SO3H was successfully introduced into the hydrophobic and inert PEEK polymer chain,and the water contact angle was reduced by up to 26.5%.The macroscopic and microstructural characterization of sulfonated PEEK showed that the SO3H group not only greatly changed the chemical composition of the PEEK chain,but also formed a multi-scale network microporous structure.The micron-sized cylindrical pore structure on the surface of the sulfonated membrane and the nano-scale circular pore mutual transmission network work together to infiltrate the surface.It is this porous physical structure similar to the trabecular bone of the joint and the hydrophilic chemical composition that enhance the hydrophilic properties of the PEEK material.The optimal preparation process for preparing the bionic porous trabecular structure is sulfonation treatment for 10 minutes.3.Design a viable UV irradiation device,prepare a graft-cured elastomer transition layer on the surface of the sulfonated PEEK by UV-curing colloidal emulsion,and prepare a hydrogel-bonded PEEK biomimetic artificial joint material by bionic joint structure.The interfacial shear strength test of biomimetic artificial joint materials showed that the silane coupling agent in the colloidal emulsion after UV irradiation had a significant effect.When the concentration of silane coupling agent was high,the shear damage occurred at the interface with PEEK substrate.In the interior of the sulfonated film layer,it can form a strong bond with PEEK.The optimum colloid mass ratio is 5%silane coupling agent,9%PVA,and the shear strength reaches 5.28 MPa.The interfacial peel strength of the hydrogel on the biomimetic artificial joint material increases with the increase of the PVA concentration in the compound emulsion,and the amount of the coupling agent and the PVA colloid concentration significantly change the adhesion of the hydrogel at the interface.Intensity,4.The UV-induced assembly preparation method was used to form a worm-like micelle string wrinkle pattern on the surface of the substrate,and a calcified cartilage bonding transition layer was formed by bionic formation.The structure and composition of the biomimetic joints were analyzed by SEM and EDS tests,and the possible reaction mechanisms were discussed.The interfacial strength test results of bionic artificial joint materials show that the PVA concentration has the greatest influence on the interfacial bond strength.The optimal mass ratio of colloidal emulsion is 7%PVA,2%acrylamide(Am)and 3%silane coupling agent.Silane coupling agent is also an important influencing factor affecting the interfacial bonding strength of bionic joint materials,which significantly improves the structural strength and water resistance of bionic joint materials.Am monomer and silane coupling agent crosslink and form a network mutual transmission structure with PVA.The adhesion work on the interface is enhanced.The optimum colloidal mass ratio of the peel strength of the hydrogel bond interface is 3%silane coupling agent,10%Am,7%PVA,and the maximum interfacial peel strength can reach 1113.8 N/m.It is a little stronger than the interface toughness of cartilage and bone.Figure:[34],table:[8],reference:[104]... |
PDF Full Text Request