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Self-aligned Graphene Sheets-Polyurethane Nanocomposites

  • Mohsen Moazzami Gudarzi (a1) (a2), Seyed Hamed Aboutalebi (a1), Nariman Yousefi (a1), Qing Bin Zheng (a1), Farhad Sharif (a2), Jie Cao (a3), Yayun Liu (a3), Allison Xiao (a3) and Jang-Kyo Kim (a1)...

Abstract

Processing graphene and graphene polymer nanocomposites in an aqueous medium has always been a big challenge due to the hydrophobic nature of graphene (or reduced graphene oxide) nanosheets. In this work, a waterborne latex of polyurethane has been used both as the matrix material for embedding the graphene nanosheets and as a unique stabilizer to help produce an up to 5 wt% graphene/PU nanocomposites. The graphene oxide/polyurethane latex aqueous suspension is reduced in-situ using hydrazine, without any trace of aggregation/agglomeration upon completion of the reduction process, which would otherwise have occurred severely were PU not present. A highly aligned nanostructure is produced when graphene content is increased beyond 2 wt%, resulting in a remarkable improvement in electrical and mechanical properties of the nanocomposite. The exceptionally low electrical percolation threshold of 0.078%, as well as 21-fold and 14 fold increases in tensile modulus and strength, respectively, have been attained thanks to the alignment of graphene nanosheets in the polymeric matrix.

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*Corresponding author: mejkkim@ust.hk

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Keywords

Self-aligned Graphene Sheets-Polyurethane Nanocomposites

  • Mohsen Moazzami Gudarzi (a1) (a2), Seyed Hamed Aboutalebi (a1), Nariman Yousefi (a1), Qing Bin Zheng (a1), Farhad Sharif (a2), Jie Cao (a3), Yayun Liu (a3), Allison Xiao (a3) and Jang-Kyo Kim (a1)...

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