Preparation And Properties Of Fluorinated Graphene / Ultra High Molecular Weight Polyethylene Composites

Objective: Preparation of fluorinated graphene(FG)/ ultra high molecular weight polyethylene(UHMWPE), testing and evaluation of its performance, in order to provide experimental data for the development and application of FG/UHMWPE artificial joints.Materials and methods: Fluorinated graphene(FG) was prepared by hydrothermal reaction. The morphology and structure of FG were characterized by transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS) and Raman spectroscopy(Raman). FG/UHMWPE composite materials were prepared by ultrasonic dispersion and hot pressing process. The mechanical properties and tribological properties of pure UHMWPE and FG/UHMWPE composites were studied by means of micro hardness tester and high speed reciprocating friction tester. Using scanning electron microscope(SEM), the wear volume of the sample was observed by Micro-XAM. The wear volume of the sample was measured by non-contact 3D surface profiler, and the relative volume wear rate(WR) was calculated. Biological compatibility of pure UHMWPE and FG/UHMWPE composite materials by using osteoblasts. Detection of antibacterial properties of composite materials by Staphylococcus aureus.Result and conclusion:1. TEM shows that the number of FG layers is about 3-4, the presence of individual 1-2 layer after ultrasonic stripping FG. FG showed a thin transparent structure, the size of 1um*2um. XPS showed that the content of F in FG prepared by hydrothermal reaction was about 29%. Raman shows that the internal structure of FG has been out of order.2. When FG increases, the hardness of FG/UHMWPE is significantly increased. The hardness of FG/UHMWPE increased by 25% when the content of FG was 0.1%. When the content of FG is 1%, the micro hardness of FG/UHMWPE is increased by 64%.3. The wear rate of FG/UHMWPE decreased with the increase of the content of fluoride, the volume wear of UHMWPE decreased by 43% when the content of FG was 1%. With the increase of FG content, the wear marks on the dual ball surface of zirconia are gradually deepened, and the wear surface is gradually enlarged. 4. FG/UHMWPE showed no cytotoxicity and could promote its growth. 5. When the concentration of FG is low, it has strong antibacterial activity.