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Functionalization and Reduction of Graphene Oxide with p-Phenylene Diamine for Electrically Conductive and Thermally Stable Polystyrene Composites
- Ma, Hui-Ling, Zhang, Hao-Bin, Hu, Qi-Hui, Li, Wen-Juan, Jiang, Zhi-Guo, Yu, Zhong-Zhen, Dasari, Aravind
- ACS Applied Materials & Interfaces 2012 v.4 no.4 pp. 1948-1953
- ammonia, electrical conductivity, graphene oxide, polystyrenes, thermal stability
- A facile and efficient approach was developed to simultaneously functionalize and reduce graphene oxide (GO) with p-phenylene diamine (PPD) by simple refluxing. This was possible by the nucleophilic substitution reaction of epoxide groups of GO with amine groups of PPD aided by NH₃ solution. As a consequence, electrical conductivity of GO-PPD increased to 2.1 × 10² S/m, which was nearly 9 orders of magnitude higher than that of GO. Additionally, after the incorporation of GO-PPD in polystyrene (PS), the composites exhibited a sharp transition from electrically insulating to conducting behavior with a low percolation threshold of ∼0.34 vol %, which was attributed to the improved dispersion and the reduction of GO-PPD. Thermal stability of the PS/GO-PPD composite was also ∼8 °C higher than that of PS.