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Self-aligned Graphene Sheets-Polyurethane Nanocomposites

Published online by Cambridge University Press:  30 August 2011

Mohsen Moazzami Gudarzi ,
Seyed Hamed Aboutalebi ,
Nariman Yousefi ,
Qing Bin Zheng ,
Farhad Sharif ,
Jie Cao ,
Yayun Liu ,
Allison Xiao  and
Jang-Kyo Kim
Mohsen Moazzami Gudarzi
Affiliation:
Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong Department of Polymer Engineering, Amirkabir University of Technology, 424 Hafez Ave, Tehran, Iran
Seyed Hamed Aboutalebi
Affiliation:
Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
Nariman Yousefi
Affiliation:
Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
Qing Bin Zheng
Affiliation:
Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
Farhad Sharif
Affiliation:
Department of Polymer Engineering, Amirkabir University of Technology, 424 Hafez Ave, Tehran, Iran
Jie Cao
Affiliation:
Advanced Technologies, Henkel Corporation, 10 Finderne Ave. Bridgewater, NJ 08807, USA
Yayun Liu
Affiliation:
Advanced Technologies, Henkel Corporation, 10 Finderne Ave. Bridgewater, NJ 08807, USA
Allison Xiao
Affiliation:
Advanced Technologies, Henkel Corporation, 10 Finderne Ave. Bridgewater, NJ 08807, USA
Jang-Kyo Kim*
Affiliation:
Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
*
*Corresponding author: mejkkim@ust.hk
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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.

Keywords

compositenanostructurepolymer
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1344: Symposium Y – Functional Two-Dimensional Layered Materials—From Graphene to Topological Insulators , 2011 , mrss11-1344-y02-06
Copyright
Copyright © Materials Research Society 2011

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