On the State of Graphene Oxide Nanosheet in a Polyurethane Matrix

Thermally stable films were obtained from a water-based polyurethane (PU) dispersion with small (0.1-1.5 wt.%) additions of graphene oxide (GO). The films were studied through elemental analysis, X-ray photoelectron spectroscopy, differential thermogravimetry, and Raman spectroscopy. It was found that the introduction of GO into a PU matrix was accompanied by a partial reduction in graphene oxide nanosheet and an increase in the concentration of defects in GO structure. It has been also established that the [C/N](at) ratio in the near-surface layer of PU/GO composite films grows with an increase in the content of graphene oxide in the composite films.

Automated summary

Thermally stable films were successfully obtained by adding small amounts of graphene oxide (GO) to a water-based polyurethane (PU) dispersion. The films were characterized using elemental analysis, X-ray photoelectron spectroscopy, differential thermogravimetry, and Raman spectroscopy. It was observed that the introduction of GO into a PU matrix led to partial reduction in graphene oxide nanosheet and an increase in defects concentration in the GO structure. The [C/N] ratio in the near-surface layer of PU/GO composite films was found to increase with the increase in graphene oxide content.