High-temperature cross-linking of carbon nanotube multi-yarn using polyvinylpyrrolidone as a binding agent
Misak, Heath Edward
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Misak, Heath Edward; Asmatulu, Ramazan; Whitman, J.; Mall, S. 2015. High-temperature cross-linking of carbon nanotube multi-yarn using polyvinylpyrrolidone as a binding agent. Journal of Nanoscience and Nanotechnology, vol. 15:no. 3:pp. 2283-2288
Carbon nanotube (CNT) multi-yarn was cross-linked together at elevated temperatures using a polymer, with the intent of improving their strength and electrical conductivity. They were functionalized using an acid treatment and immersed in a bath of different concentrations (0.5%, 0.1%, and 0.2%) of polyvinylpyrrolidone (PVP). Then they were placed in an oven at various temperatures (180 degrees C, 200 degrees C, and 220 degrees C) in order to cause cross-linking among the carbon nanotube yarns. The physical, chemical, electrical, and mechanical properties of the cross-linked yarns were investigated. The yarns cross-linked at higher temperatures and greater concentrations of PVP had a greater increase in linear mass density, indicating that the cross-linking process had worked as expected. Yarns that were cross-linked at lower temperatures had greater tensile strength and better specific electrical conductivity. Those that were treated with a greater concentration of polymer had a greater ultimate tensile strength. All these results are encouraging first step, but still need further development if CNT yarn is to replace copper wire.
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