Abstract
Natural joints have the hierarchical structure of bone and cartilage, providing excellent lubrication and load-carrying capacity. In our research, the hierarchical structure artificial joints of Poly Acrylic Acid (PAA)- Poly Acrylamide (PAAm) hydrogel coating and Ti6Al4V substrate were formed using a simple yet versatile method by mimicking the hierarchical structure of natural joints. The efficient lubrication at friction interfaces was achieved. The composition and microstructure were confirmed by Fourier-transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM). The hydrogel coatings were successfully prepared on the surface of Ti6Al4V substrate through the adsorption of the charged group. This hierarchical structure material exhibits the lower dynamic friction, approximately 0.085, which is much lower than bare Ti6Al4V, about 0.429. The wear on the surfaces after the tribological experiment is super-shallow and has no significant fracture area around the scratch. The PAA-PAAm hydrogel has a more uniform and compact cross-linked network porous structure, and the porous size is much smaller than PAA hydrogel. The cross-linked network porous structure is the main factor accounting for the low dynamic friction. This hierarchical structure of soft and hard improve the load-carrying ability and has the potential uses in artificial joints.
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Acknowledgements
The authors wish to express thanks to the financial support of China Postdoctoral Science Foundation (Grant No. 2018 M632310), Youth Science and Technology Innovation Foundation of Nanjing Forestry University (Grant No. CX2018023), The Project National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology (Grant No. 201902).
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Deng, Y., Sun, J., Ni, X. et al. Tribological properties of hierarchical structure artificial joints with poly acrylic acid (AA) - poly acrylamide (AAm) hydrogel and Ti6Al4V substrate. J Polym Res 27, 157 (2020). https://doi.org/10.1007/s10965-020-02143-z
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DOI: https://doi.org/10.1007/s10965-020-02143-z