Kap Seung Yang1

1, Chonnam National University, Gwangju, , Korea (the Republic of)

The lyotropic liquid crystal formation of GO was first reported by Kim et al [1], but the concentration of the liquid crystal was relatively lower (<1 wt. %) and also the reported fiber spinning rate from the solution was lower (2m/min).
The ultimate goal of this study is to prepare highly ordered GO-mesophase carbon fiber through melt spinning process at higher spinning rate and also to achieve homogeneous dispersion of high concentration of GO in aromatic hydrocarbon through introduction of π-π’ interactions among aromatic hydrocarbons and GO.
In this study we have successfully prepared highly ordered GO- mesophase carbon fiber with GO 10wt% at a high spinning rate of 350 m/min. GO was first physically mixed in meso-phase pitch by using mortar and later the fiber was produced using melt spinning process. The spinning rate of the GO- mesophase pitch based carbon fiber is sensitive of the oxygen content present in GO. In order to achieve superior spinnability, the GO used in our experiment was tuned by microwave treatment at certain time and power.
The structure of the melt spun fiber etched by quinoline and THF solution were investigated by SEM analysis. Etching was done in order to confirm the dispersion of GO inside the fiber.

[1] Sang Ouk Kim et al, Graphene Oxide Liquid Crystals, Angew. Chem. Int. Ed. 2011, 50, 3043 –3047.