TY - JOUR
T1 - Simultaneous in situ reduction, self-alignment and covalent bonding in graphene oxide/epoxy composites
AU - Yousefi, Nariman
AU - Lin, Xiuyi
AU - Zheng, Qingbin
AU - Shen, Xi
AU - Pothnis, Jayaram R.
AU - Jia, Jingjing
AU - Zussman, Eyal
AU - Kim, Jang Kyo
N1 - Funding Information: The project was supported by the Research Grants Council of Hong Kong SAR (Project codes: 614010 , 613811 ). The epoxy resin system was supplied by Kukdo Chemicals Co., Korea. N.Y. and X.S. were recipients of the Hong Kong PhD Fellowship. Technical assistance from the Materials Characterization and Preparation Facilities (MCPF) and Advanced Engineering Materials Facilities (AEMF) of HKUST is appreciated.
PY - 2013/8
Y1 - 2013/8
N2 - Graphene oxide (GO)/waterborne epoxy (EP) composites are prepared using an easy, all aqueous, in situ polymerization method. GO is reduced in situ using hydrazine to achieve highly stable reduced graphene oxide (rGO)/EP dispersions, leading to the formation of composites with a self-aligned layered structure and highly anisotropic properties between the direction of alignment and that perpendicular to it. The strong covalent bonding between the epoxy and rGO and the highly aligned, ultralarge rGO sheets give rise to a remarkable percolation threshold of 0.12 vol.%, as well as much improved mechanical, electrical and thermal properties of the composites in the alignment direction. They outperform those containing GO sheets that are bonded to the epoxy matrix through a weaker π-π stacking mechanism.
AB - Graphene oxide (GO)/waterborne epoxy (EP) composites are prepared using an easy, all aqueous, in situ polymerization method. GO is reduced in situ using hydrazine to achieve highly stable reduced graphene oxide (rGO)/EP dispersions, leading to the formation of composites with a self-aligned layered structure and highly anisotropic properties between the direction of alignment and that perpendicular to it. The strong covalent bonding between the epoxy and rGO and the highly aligned, ultralarge rGO sheets give rise to a remarkable percolation threshold of 0.12 vol.%, as well as much improved mechanical, electrical and thermal properties of the composites in the alignment direction. They outperform those containing GO sheets that are bonded to the epoxy matrix through a weaker π-π stacking mechanism.
UR - https://www.scopus.com/pages/publications/84877697667
U2 - 10.1016/j.carbon.2013.03.034
DO - 10.1016/j.carbon.2013.03.034
M3 - Article
SN - 0008-6223
VL - 59
SP - 406
EP - 417
JO - Carbon
JF - Carbon
ER -