We report on the dispersion state of partially reduced graphene oxide (PRGO) in organic solvents, namely methyl ethyl ketone, ethyl acetate, methylene chloride, toluene, and xylene, by controlling the carbon to oxygen (C/O) atomic ratio of the PRGOs. A two-phase solvent exchange method is also proposed to transfer PRGO from water to an aprotic solvent, such as methyl ethyl ketone. We achieve relatively good dispersion in aprotic and non-polar solvents by controlling the C/O atomic ratio of the PRGOs and applying the two-phase solvent exchange method. There is an increase in the glass transition temperatures with the dispersion of PRGOs into amorphous polymers, in particular a 4.4°C increase for poly(methyl methacrylate) and 3.0°C increase for polycarbonate. Good dispersion of PRGO in a nonpolar polymer, such as linear low density polyethylene, is also obtained.

• Hye Min Kim(Department of Chemical Engineering, Donga-A University, Busan 49315, Korea. Sangbo Co., Ltd., Suwon 16229, Korea)
• Seo Gyun Kim(Department of Chemical Engineering, Donga-A University, Busan 49315, Korea)
• Heon Sang Lee(Department of Chemical Engineering, Donga-A University, Busan 49315, Korea) Corresponding Author