Nano-Halloysite Concentration Effects on Fracture Toughness of Diverse Epoxy Nanocomposites

    (Received 23 August 2013; accepted 25 November 2013)

    Published Online: 2014

    CODEN: MPCOAD

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    Abstract

    We experimentally report material design of halloysite nanotube (HNT)/epoxy composites, focusing on the effects of HNT concentration on thermal and mechanical properties, especially fracture toughness, of diverse epoxy composites with as-received and phenylphosphonic-acid (PPA)-treated HNTs prepared by mechanical mixing or ball-milling homogenization. It is demonstrated that, with HNT added in the region of 0.0–10.0 wt. %, significantly reinforced fracture toughness of the epoxy composites can be achieved. The epoxy composites prepared by ball-milling homogenization have much more uniform HNT size and dispersion than those prepared by simple mechanical mixing, enhancing their fracture toughness. The morphology of treated HNTs changes from nanotubes to nanoplatelets; as a result, with a substantial increase in the total contact area between HNT and epoxy and enhancing the fracture toughness of epoxy composites. This higher HNT concentration and the higher fracture toughness are achieved for various epoxy composites. However, the optimal concentration of HNT is 5.0 wt. % in this study. The addition of further HNT achieves only marginal fracture toughness enhancement and more negative effects appear, such as HNT concentration gradient in cured epoxy composites, high potential decrease in glass transition temperature (Tg), and potential immature tensile failure.


    Author Information:

    Han, Wei
    Centre for Nanoscale Science and Technology; and Centre for Maritime Engineering, Control and Imaging, School of Computer Science, Engineering and Mathematics,

    Yu, Yang
    Centre for Nanoscale Science and Technology, School of Computer Science, Engineering and Mathematics; and Centre for Nanoscale Science and Technology, School of Chemical and Physical Sciences,

    Tang, Youhong
    Centre for Nanoscale Science and Technology; and Centre for Maritime Engineering, Control and Imaging, School of Computer Science, Engineering and Mathematics,

    Sammut, Karl
    Centre for Maritime Engineering, Control and Imaging, School of Computer Science, Engineering and Mathematics,


    Stock #: MPC20130032

    ISSN: 2165-3992

    DOI: 10.1520/MPC20130032

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    Author
    Title Nano-Halloysite Concentration Effects on Fracture Toughness of Diverse Epoxy Nanocomposites
    Symposium , 0000-00-00
    Committee E08