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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 29284

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Functionalization and Characterization of Carbon Nanotubes/ Polypropylene Nanocomposite
Chemical and physical functionalization of multiwalled carbon nanotubes (MWCNT) has been commonly practiced to achieve better dispersion of carbon nanotubes (CNTs) in polymer matrix. This work describes various functionalization methods (acidtreatment, non-ionic surfactant treatment with TritonX-100), fabrication of MWCNT/PP nanocomposites via melt blending and characterization of mechanical properties. Microscopy analysis (FESEM, TEM, XPS) showed effective purification of MWCNTs under acid treatment, and better dispersion under both chemical and physical functionalization techniques combined, in their respective order. Tensile tests showed increase in tensile strength for the nanocomposites that contain MWCNTs up to 2 wt%. A decrease in tensile strength was seen in samples that contain 4 wt% of MWCNTs for both raw and Triton X-100 functionalized, signifying MWCNT degradation/rebundling at composition with higher content of MWCNTs. For the acid-treated MWCNTs, however, the tensile results showed slight improvement even at 4wt%, indicating effective dispersion of MWCNTs.
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[3] Jian Zhao, "A Literature Review on Dispersion of Carbon Nanotubes and Their PolymerComposites", Department of Materials Science and Engineering, University of Cincinnati, October 2001
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[8] D. Bikiaris, A. Vassilou, K. Chrissafis, K.M. Paraskevopoulos, A. Jannakoudakis, A. Docoslis, "Effect of Acid Treated Multi-Walled Carbon Nanotubes on the Mechanical, Permeability, Thermal Properties and Thermo-oxidative Stability of Isotactic Polypropylene", Polymer Degradation and Stability 93, 2008, 952-967
[9] SP Bao, SC Tjong. "Mechanical Behaviours of Polypropylene/Carbon Nanotube Nanocomposites: The effects of loading rate and temperature", Material Science and Engineering A, 2007
[10] Bing-Xing Yang, Jia-Hua Shi, KP Promoda, Suat Hong Goh, "Enhancement of the Mechanical Properties of Polypropylene using Polypropylene Grafted Multiwalled Carbon Nanotubes", Composite Science and Technology 68, 2008
[11] J Rausch, RC Zhuang, E Mader, "Surfactant Assisted Dispersion of Functionalized Multi-walled Carbon Nanotubes in Acqueous Media", Composites: Part A 41, 1038-1046, 2010.
[12] Islam MF, Rojas E, Bergey DM, Johnson AT, Yodh AG, "High Weight Fraction Surfactant Solubilization of single-wall carbon nanotubes in water", Nano Lett, 3:269-73, 2003
[13] Y Bai, D Lin, F Wu, Z Wang, B Xing, "Adsorption of Triton X-series surfactants and its role in stabilizing multi-walled carbon nanotube suspensions" Chemosphere 79, 362-367, 2010
[14] M Bystrzejweski, A Huczko, H Lange, T Gemming, B Buchner, MH Rummeli, "Dispersion and diameter separation of multi-wall carbon nanotubes in aqueous solutions", Journal of Colloid and Interface Science 345, 138-142, 2010
[15] D Bikiaris, "Microstructure and Properties of Polpropylene/Carbon Nanotube Nanocomposites", Materials, 3, 2884-2946, 2010
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