X. Wang, W. Y. Xing, L. Song, H. Y. Yang, Y. Hu and G. H. Yeoh (2012) Fabrication and characterization of graphene-reinforced waterborne polyurethane nanocomposite coatings by the sol-gel method. Journal/Surface &, Coatings Technology 206 4778-4784. [In English]
Web link: http://dx.doi.org/10.1016/j.surfcoat.2012.03.077
Keywords: Waterborne polyurethane (WPU), Functionalized graphene (f-GNS), Mechanical properties, Sol-gel method, EXFOLIATED GRAPHITE OXIDE, SHEET NANOCOMPOSITES, PHYSICAL-PROPERTIES, POLYMERIZATION, COMPOSITES, NANOSHEETS
Abstract: Functionalized graphene-reinforced polyurethane nanocomposite coatings were prepared using the sol-gel method. This method not only provides a "green" strategy for fabricating the graphene-based nanocomposites, but also realizes the covalent functionalization of graphene nanosheets with polymer matrix. The functionalization of graphene with conjugated organosilanes is favorable for improving mechanical and thermal properties of the nanocomposite coatings, which is mainly attributed to the homogeneous dispersion of functionalized graphene in the polymer matrix and strong interfacial interactions between the two components. A 71% increase in tensile strength and a 86% improvement of Young's modulus are observed by the addition of 2.0 wt.% of functionalized graphene. The experimentally determined Young's modulus corresponds well with the theoretical simulation under the hypothesis that the graphene sheets are randomly dispersed in the polymer matrix. (C) 2012 Elsevier B.V. All rights reserved.