Abstract
Graphene oxide was prepared by the Hummers’ method and then functionalized with 4-substituted benzoic acid via “direct Friedel–Crafts” acylation in a mild reaction medium of polyphosphoric acid/phosphorous pentoxide (P2O5). Raman spectroscopy, differential scanning calorimetry, thermo-gravimetric analysis, and transmission electron microscopy were used to characterize the resultant structure. The results show that 4-substituted benzoic acid functionalized graphene (FG) sheets were achieved without pretreatment of oxidation. Polycaprolactam (PA6)-FG composites were prepared by in situ polymerization of ε-caprolactam in the presence of FG. Nanocomposite fiber with 0.01–0.5 wt% content of FG was prepared with a piston spinning machine and hot-roller drawing machine. A significant enhancement of mechanical properties of the PA6-FG composites’ fiber is obtained at low graphene loading; that is, a 29 % improvement of tensile strength and a three times increase of Young’s modulus are achieved at a graphene loading of only 0.1 wt%. The “graft-from” methodologies pave the way to prepare graphene-based nanocomposites of condensation polymers with promising performance and functionality.
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Acknowledgements
This study was financially supported by the Science and Technology Development Plan of Tianjin Municipal (09JCZDJC22300) and the Special Program for Key Basic Research of the Ministry of Science and Technology (2010CB334711).
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Liu, H., Hou, L., Peng, W. et al. Fabrication and characterization of polyamide 6-functionalized graphene nanocomposite fiber. J Mater Sci 47, 8052–8060 (2012). https://doi.org/10.1007/s10853-012-6695-5
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DOI: https://doi.org/10.1007/s10853-012-6695-5