Journal ArticleDOI
Highly aligned, ultralarge-size reduced graphene oxide/polyurethane nanocomposites: Mechanical properties and moisture permeability
Nariman Yousefi,Mohsen Moazzami Gudarzi,Mohsen Moazzami Gudarzi,Qingbin Zheng,Xiuyi Lin,Xi Shen,Jingjing Jia,Farhad Sharif,Jang Kyo Kim +8 more
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TLDR
In this article, a polyurethane (PU) nanocomposite with highly aligned graphene oxide (GO) is produced, and the agreement between the experiments and theoretical predictions for tensile modulus proves that the graphene sheets are indeed dispersed individually on the molecular scale and oriented in the polymer matrix to form a layered structure.Abstract:
Polyurethane (PU) nanocomposite films containing highly-aligned graphene sheets are produced. Aqueous dispersion of ultralarge-size graphene oxide (GO) is in situ reduced in waterborne polyurethane, resulting in fine dispersion and high degree of orientation of graphene sheets, especially at high graphene contents. The PU/reduced GO nanocomposites present remarkable 21- and 9-fold increases in tensile modulus and strength, respectively, with 3 wt.% graphene content. The agreement between the experiments and theoretical predictions for tensile modulus proves that the graphene sheets are indeed dispersed individually on the molecular scale and oriented in the polymer matrix to form a layered structure. The moisture permeability of the nanocomposites presents a systematic decrease with increasing graphene content, clearly indicating the impermeable graphene sheets acting as moisture barrier. The synergy arising from the very high aspect ratio and horizontal alignment of the graphene sheets is responsible for this finding.read more
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Mechanical properties of graphene and graphene-based nanocomposites
TL;DR: In this paper, the current status of the intrinsic mechanical properties of the graphene-family of materials along with the preparation and properties of bulk graphene-based nanocomposites is thoroughly examined.
Journal ArticleDOI
Enhancement of barrier and corrosion protection performance of an epoxy coating through wet transfer of amino functionalized graphene oxide
TL;DR: An amino functionalized graphene oxide (FGO) was synthesized and characterized by Fourier transform infrared spectroscopy (FTIR) and X-Ray diffraction analysis (XRD) as mentioned in this paper.
Journal ArticleDOI
Electrically conductive thermoplastic elastomer nanocomposites at ultralow graphene loading levels for strain sensor applications
Hu Liu,Yilong Li,Kun Dai,Guoqiang Zheng,Chuntai Liu,Changyu Shen,Xingru Yan,Jiang Guo,Zhanhu Guo +8 more
TL;DR: In this paper, an electrically conductive ultralow percolation threshold of 0.1 wt% graphene was observed in the thermoplastic polyurethane (TPU) nanocomposites.
Journal ArticleDOI
A review of the mechanical and thermal properties of graphene and its hybrid polymer nanocomposites for structural applications
TL;DR: In this paper, a review of the recent progress in describing the intricacies of mechanical and thermal properties of all types of graphene and modified graphene-based polymer nanocomposites has been comprehensively examined.
Journal ArticleDOI
Nanoindentation in polymer nanocomposites
TL;DR: In this article, the authors present a review of the state-of-the-art in the field of instrumented indentation of polymer nanocomposite materials and present challenges and future perspectives in the application of depth-sensing instrumentation to characterize mechanical properties.
References
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Electric Field Effect in Atomically Thin Carbon Films
Kostya S. Novoselov,Andre K. Geim,Sergey V. Morozov,Da Jiang,Y. Zhang,S. V. Dubonos,Irina V. Grigorieva,A. A. Firsov +7 more
TL;DR: Monocrystalline graphitic films are found to be a two-dimensional semimetal with a tiny overlap between valence and conductance bands and they exhibit a strong ambipolar electric field effect.
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Measurement of the Elastic Properties and Intrinsic Strength of Monolayer Graphene
TL;DR: Graphene is established as the strongest material ever measured, and atomically perfect nanoscale materials can be mechanically tested to deformations well beyond the linear regime.
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Graphene: Status and Prospects
TL;DR: This review analyzes recent trends in graphene research and applications, and attempts to identify future directions in which the field is likely to develop.
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Graphene-based composite materials
Sasha Stankovich,Dmitriy A. Dikin,Geoffrey Dommett,K. Kohlhaas,Eric Zimney,Eric A. Stach,Richard D. Piner,SonBinh T. Nguyen,Rodney S. Ruoff +8 more
TL;DR: The bottom-up chemical approach of tuning the graphene sheet properties provides a path to a broad new class of graphene-based materials and their use in a variety of applications.