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fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Languages: English
Types: Unknown
Subjects: J400, H300, F200
Carbon nanotubes, because of their exceptional mechanical properties, are one of the potential reinforcements for polymers in near future. Before substituting these nanocomposites in commercial applications, there are many problems, like dispersion, agglomeration, cost effectiveness etc., which need to be sorted. Processing such nanocomposites for longer durations is quite frequently observed these days. Apart from the other major obstacles, re-agglomeration, because of strong van der walls forces between carbon nanotubes, is one of the latest problems that has been always underestimated and ignored. In this study, different carbon nanotubes (Single-wall nanotubes (SWNT), Double wall nanotubes (DWNT), Amino-modified double wall nanotubes (DWNT-NH2), Thin Multi wall nanotubes (MWNT) and COOH-modified thin multi wall nanotubes (MWNT-COOH)) at different concentrations (0.025, 0.05 and 0.1 %wt) in two-part epoxy system (Liquid Epoxy, Liquid hardener and Liquid epoxy-hardener mixture) were studied involving nano-particle size analyzer. After a study of 3 hours, it was observed that there is a strong dependence of re-aggregation profile on the employed homogenizing technique, i.e. high-power bath ultrasonication in this study. Apart from nanotubes/epoxy mixture, higher concentrations yielded higher aggregates profile and vice versa. Re-agglomeration, with the passage of time, in liquid epoxy was found to be least as compared to liquid hardener and liquid epoxy-hardener mixture. Hardener in liquid-epoxy mixture was the main culprit responsible for re-aggregation. Results were further verified by scanning electron microscopy, which revealed significant differences in the microstructures of the cured and fractured samples. Suggestions for altering processing parameters in order to avoid this major obstacle are discussed.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • S. Iijima, “Helical microtubules of graphitic carbon” Nature, vol. 354, pp. 56-58, 1991
    • J.D. Fidelus, E. Wiesel, F.H. Gojny, K. Schulte and H.D. Wagner, “Thermo-mechanical properties of randomly oriented carbon/epoxy nanocomposites” Composites Part A, vol. 36, pp. 1555-1561, 2005 R. Khare and S. Bose, “Carbon nanotube based composites- A review” J Miner Mater Charac Eng, vol. 4, pp. 31-46, 2005
    • P.M. Ajayan, L.S. Schadler, and P.V. Braun, Nanocomposite Science and Technology, Wiley-VCH, 2003
    • O. Breuer and U. Sundararaj, “Big Returns from Small Fibers: A Review of Polymer/ Carbon Nanotube Composites”, Polym Compos, vol. 25, pp. 630-645, 2004
    • L. Liu and H.D. Wagner, “Rubbery and glassy epoxy resins reinforced with carbon nanotubes”, Compos Sci Technol, vol. 65, pp. 1861-1868, 2005 J. Njuguna and K. Pielichowsky, “Polymer Nanocomposites for Aerospace Applications: Properties”, Adv Eng Mater, vol. 5, pp. 769-768, 2003 R. Andrews and M.C. Weisenberger, “Carbon nanotube polymer composites” Curr Opin Solid State Mater Sci, vol. 8, pp. 31-37, 2004
    • F.H. Gojny, M.H.G. Wichmann, U. Kopke, B. Fiedler, K. Schulte, “Carbon nanotube-reinforced epoxycomposites: enhanced stiffness and fracture toughness at low nanotube content” Compos Sci Technol, vol. 64, pp. 2363-2371, 2004
    • [10] B. Fiedler, F.H. Gojny, M.H.G. Wichmann, M.C.M. Nolte and K. Schulte, “Fundamental aspects of nanoreinforced composites” Compos Sci Technol, vol. 66, pp. 3115-3125, 2006
    • [11] R.H. Baughman, A.A Zakhidov and W.A.D Heer. “Carbon nanotubes-the route toward applications” Science, vol. 297, pp. 787-92, 2002
    • [12] X.L. Xie, Y.W. Mai and X.P. Zhou, “Dispersion and alignment of carbon nanotubes in polymer matrix: A review” Mater Sci Eng, R, vol. 49, pp. 89-112, 2005
    • [13] J.N. Coleman, U. Khan, W.J. Blau, Y.K. Gun'ko, “Small but strong: A review of the mechanical properties of carbon nanotube-polymer composites” Carbon, vol. 44, pp. 1624-1652, 2006
    • [14] J. Gou, Z. Liang, C. Zhang and B. Wang, “Computational analysis of effect of single-walled carbon nanotube rope on molecular interaction and load transfer of nanocomposites” Composites Part B, vol. 36, pp. 524-533, 2005
    • [15] K.T. Lau and D. Hui, “The revolutionary creation of new advanced materials--carbon nanotube composites” Composites Part B, vol. 33, pp. 263-277, 2002
    • [16] L. Jiang, L. Gao and J. Sun, “Production of aqueous colloidal dispersions of carbon nanotubes” J Colloid Interface Sci, vol. 260, pp. 89-94, 2003
    • [17] T. Ramanathan, H. Liu and L.C. Brinson, “Functionalized SWCNT/polymer nanocomposites for dramatic property improvement” J Polym Sci, Part B: Polym Phys, vol. 43, pp. 2269-79, 2005
    • [18] N. Grossiord, O. Regev, J. Loos, J. Meuldijk and C.E. Koning, “Time-dependent study of the exfoliation process of carbon nanotubes in aqueous dispersions by using UV-visible spectroscopy” Anal Chem, vol. 77, pp. 5135-5139, 2005
    • [19] S. Wang, Z. Liang, T. Liu, B. Wang and C. Zhang, “Effective amino-functionalization of carbon nanotubes for reinforcing epoxy polymer composites” Nanotechnology, vol. 17, pp. 1551-1557, 2006
    • [20] J.P. Salvetat, J.M. Bonard, N.H. Thomson, A.J. Kulik, L. Forr´o, W. Benoit et al., “Mechanical properties of carbon nanotubes” Appl Phys A, vol. 69, pp. 255-60, 1999
    • [21] J. Robertson, “Realistic applications of CNTs” Materialstoday, vol. 7, pp. 46-52, 2004
    • [22] P. Gröning, “Nanotechnology: An approach to mimic natural architectures and concepts” Adv Eng Mater, vol. 7, pp. 279-291, 2005
    • [23] J.K.W. Sandler, J.E. Kirk, I.A. Kinloch, M.S.P. Shaffer and A.H. Windle, “Ultra-low electrical percolation threshold in carbon-nanotube-epoxy composites” Polymer, vol. 44, pp.5893-5899, 2003
    • [24] M.B. Bryning, M.F. Islam, J.M. Kikkawa and A.G. Yodh, “Very low conductivity threshold in bulk isotropic single-walled carbon nanotube-epoxy composites” Adv Mater, vol. 17, pp. 1186-1191, 2005
    • [25] H. Dai, “Carbon nanotubes: opportunities and challenges” Surf Sci, vol. 500, pp. 218-41, 2002
    • [26] L.R. Xu, V. Bhamidipati, W.H. Zhong, J. Li, C.M. Lukehart, E.L. Curzio et al., “Mechanical property characterization of a polymeric nanocomposite reinforced by graphitic nanofibers with reactive linkers” J Compos Mater, vol. 38, pp. 1563-1582, 2004
    • [27] M.F. Yu, O. Lourie, M.J. Dyer, K. Moloni, T.F. Kelly, R.S. Ruoff, “Strength and breaking mechanism of multiwalled carbon nanotubes under tensile load” Science, vol. 287, pp. 637-40, 2000
    • [28] R.A.Graff, J.P. Swanson, P.W. Barone, S. Baik, D.A. Heller, M.S. Strano, “Achieving individual-nanotube dispersion at high loading in single-walled carbon nanotube composites” Adv Mater, vol. 17, pp. 980-984, 2005
    • [29] A. Yasmin and I.M. Daniel, “Mechanical and thermal properties of graphite platelet/epoxy composites” Polymer, vol. 45, pp. 8211-8219, 2004
    • [30] R.F. Service, “Superstrong nanotubes show they are smart, too” Science, vol. 281, pp. 940-942, 1998
    • [31] E.T. Thostenson, C. Li and T.W. Chou, “Nanocomposites in context” Compos Sci Technol, vol. 65, pp. 491-516, 2005
    • [32] H. Miyagawa, M.J. Rich and L.T. Drzal, “Thermophysical properties of epoxy nanocomposites reinforced by carbon nanotubes and vapor grown carbon fibers” Thermochim Acta, vol. 442, pp. 67-73, 2006
    • [33] J.K. Borchardt, “Research News, Purity counts when it comes to carbon nanotubes” Materialstoday, vol. 7, p. 15, 2005
    • [34] F. Inam and T. Peijs, “Re-aggregation of Carbon Nanotubes in two-part epoxy system” Carbon, in press.
    • [35] CYCOM® 823 RTM Liquid epoxy resin, Technical datasheet, Cytec engineered materials USA, 2003
    • [36] Zetasizer nano series user manual, Man 0317, Malvern instruments ltd UK, 2004
    • [37] J. Bae, J. Jang and S.H. Yoon, “Cure Behavior of the Liquid-Crystalline Epoxy/Carbon Nanotube System and the Effect of Surface Treatment of Carbon Fillers on Cure Reaction” Macromol Chem Phys, vol. 203, pp. 2196-2204, 2002
    • [38] F. Inam and T. Peijs, “Transmission light microscopy of carbon nanotubes-epoxy nanocomposites involving different dispersion methods” Adv Compos Lett, vol. 15, pp. 7-13, 2006
    • [39] J.N. Coleman, M. Cadek, R. Blake, V. Nicolosi, K.P. Ryan, C. Belton et al., “High-Performance NanotubeReinforced Plastics: Understanding the Mechanism of Strength Increase” Adv Funct Mater, vol. 14, pp. 791- 798, 2004
    • [40] C.A. Dyke and J.M. Tour, “Covalent Functionalization of Single-Walled Carbon Nanotubes for Materials Applications” J Phys Chem A, vol. 108, pp. 11151- 11159, 2004
    • [41] X. Gong, J. Liu, S. Baskaran, R.D. Voise and J.S. Young, “Surfactant-assisted processing of carbon nanotube/polymer composites” Chem Mater, vol. 12, pp. 1049-1052, 2000
    • [42] Z. Shen, M. Johnsson, Z. Zhao and M. Nygren, “Spark Plasma Sintering of Alumina”, J Am Ceram Soc, vol. 85, pp. 1921-1927, 2002
    • M. Omori, “Sintering, consolidation, reaction and crystal growth by the spark plasma system (SPS)” Mater Sci Eng, A, vol. 287, pp. 183-188, 2000
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