Chemical Engineering of the Single-Walled Carbon Nanotube-Nylon 6 Interface

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• 作者：Junbo Gao ; Bin Zhao ; Mikhail E. Itkis ; Elena Bekyarova ; Hui Hu ; Verina Kranak ; Aiping Yu ; and Robert C. Haddon
• 刊名：Journal of the American Chemical Society
• 出版年：2006
• 出版时间：June 14, 2006
• 年：2006
• 卷：128
• 期：23
• 页码：7492 - 7496
• 全文大小：235K
• 年卷期：v.128,no.23(June 14, 2006)
• ISSN：1520-5126

文摘

We report an approach to the chemical engineering of the single-walled carbon nanotube(SWNT)-polymer interfacial interaction in a nylon 6 graft copolymer composite which is based on thedegree of SWNT functionality. Continuous fibers are drawn from composites fabricated from the in situpolymerization of caprolactam with SWNTs possessing a range of carboxylic acid (SWNT-COOH) andamide (SWNT-CONH₂) functionalities. Mechanical performance evaluation of the composite fibers showsthat a high concentration of the carboxylic acid functional groups leads to a stronger SWNT-nylon interfacialinteraction, as reflected in greater values of the Young's modulus and mechanical strength. Replacementof the COOH group by CONH₂ in the SWNT starting material changes the grafting polymerization chemistry,thereby leading to the covalent attachment of longer graft copolymer chains to the SWNTs, and alters thecomposite morphology while increasing the composite flexibility and toughness.