| 초록 |
Graphene oxide (GO) is a water-soluble nanomaterial prepared through extensive chemical attack of graphite crystals to introduce oxygen containing defects in the graphite stack, followed by complete exfoliation of the solid into sheets of atomic thickness by either thermal or mechanical treatments. In this experiment, we made GO in high yield by Hummers’ method, in which a very long oxidation period was combined with a high quality purification process. Also, isocyanate-treated GO (iGO) was prepared by treatment of GO with allyl isocyanate. Modifications were confirmed by XPS, FT-IR and XRD. A series of waterborne polyurethane (WPU)-GO and iGO nanocomposites were synthesized by solvent blending method. The content of graphitic derivates was 0.5 wt%. The mechanical and thermal properties of WPU-iGO were higher than WPU-GO because iGO was bonded with urethane chain chemically. |
