Highly aligned, ultralarge-size reduced graphene oxide/polyurethane nanocomposites: Mechanical properties and moisture permeability

被引:243
作者
Yousefi, Nariman [1 ]
Gudarzi, Mohsen Moazzami [1 ,2 ]
Zheng, Qingbin [1 ]
Lin, Xiuyi [1 ]
Shen, Xi [1 ]
Jia, Jingjing [1 ]
Sharif, Farhad [2 ]
Kim, Jang-Kyo [1 ]
机构
[1] Hong Kong Univ Sci & Technol, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China
[2] Amirkabir Univ Technol, Dept Polymer Engn & Color Technol, Tehran, Iran
关键词
Polymer-matrix composites (PMCs); Nano-structures; Mechanical properties; GRAPHITE NANOPLATELETS; EXFOLIATED GRAPHENE; PHYSICAL-PROPERTIES; ELASTIC PROPERTIES; CARBON NANOTUBES; POLYMER; COMPOSITES; MORPHOLOGY; BARRIER; PHASE;
D O I
10.1016/j.compositesa.2013.02.005
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:42 / 50
页数:9
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