Studies On Multilayer Composites Of Artificial Joints Based On HMWPE Matrix

Ultra-high molecular weight polyethylene (UHMWPE) and polyvinyl alcohol (PVA) hydrogels are two common biological materials, and it is widely used as artificial joints materials, but the wear debris of the UHMWPE composites material after friction will cause a huge pain and cause bone interface melting phenomenon. PVA hydrogel is used as artificial joints materials, its strength is not high and not easily fixed. Based on the issues above, we plan to connect UHMWPE with PVA for comprehensive study to prepare artificial joints composites with high wear-resistant and easy to fixed properties.Firstly, I plan to prepare porous UHMWPE/Hydroxyapatite (HA) matrix, and then filled the hole with PVA solution, and finally composite Laponite/HA/PVA hydrogel to the surface of the composite to get a final composite with biological property, high strength and high water absorption properties. Using liquid paraffin as solvent and solution method to prepare UHMWPE/HA composite materials.SEM shows that the UHMWPE composite particles coated HA, effectively inhibited the aggregation of HA particles. Then, using NaCl as porogen to prepare a series of porous UHMWPE/HA composite with solution method. SEM shows that the pore size is about200um and with uniform distribution, the porosity of the composite material is more than50%.In order to reinforced composite with biocompatiblity, the HA is added. Also the HA particles can improve the bonding strength of the composite. Secondly Use the laponite clay as a template, in-situ of HA. On the one hand,it can improve the dispersibility of HA in an aqueous solution, on the other hand it can increase the gel strength and elasticity. Finally, the UHMWPE matrix composite laponite/HA/PVA hydrogel to get artificial joint material, the trend of friction coefficient is increase first and then decrease with different load, and it is suitable as biomaterial for further applications.