Preparation of graphene oxide reinforced hydroxyapatite Poly (vinyl alcohol) nanocomposite materials

摘要

In this paper, graphite oxide and hydroxyapatite (HA) were successfully synthesized. GO was used to improve the barrier property and mechanical strengthen for the nanocomposite materials. XRD showed that the GO diffraction peak for the corresponding (001) reflection is about 2θ = 12.1o and AFM observations showed that the GO sheets heighted around 400 nm. SEM observation of HA nanoparticles indicates that the morphology of the HA was rod like particle with 30-50 nm in length and 10-20 nm wide and HA-GO SEM showed that the GO flasks covered with the HA particles to form the uniform mixtures. FTIR spectrum of HA-GO-PVA, these vibrations combined the results from HA, GO and PVA. DSC thermograms indicates that the glass transition temperature (Tg) for the HA-GO-PVA nanocomposite was 78 oC. Thermogravimetric analysis (TGA) showed three steps of weight loss: 13.3% absorbed water release from 70 °C to 215 °C; 52.4% of PVA polymer chains degradation from 215 °C to 410 °C; and 14.2% further dehydrated of HA 410 °C to 526 °C. The stress-strain curve for the HA-GO-PVA nanocomposite showed that the tensile strength was 42.6 MPa and Young’s modulus was 207.8 MPa, and the fractured elongation was 130%. These results showed that this nanocomposite material is a promising coating material for the biomedical applications.