Effects of Combining Graphene Nanoplatelet and Phosphorous Flame Retardant as Additives on Mechanical Properties and Flame Retardancy of Epoxy Nanocomposite oleh Woranan Netkueakul, Beatrice Fischer, Christian Walder, Frank Nüesch, Marcel Rees, Milijana Jovic, Sabyasachi Gaan, Peter Jacob, Jing Wang