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Interaction of toughening mechanisms in a hybrid epoxy system

Authors

  • Nam Ho Kim,

    1. Discipline of Mechanical Engineering, Faculty of Engineering and Built Environment, School of Engineering, University of Newcastle, Callaghan, New South Wales 2308, Australia
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  • Ho Sung Kim

    Corresponding author
    1. Discipline of Mechanical Engineering, Faculty of Engineering and Built Environment, School of Engineering, University of Newcastle, Callaghan, New South Wales 2308, Australia
    • Discipline of Mechanical Engineering, Faculty of Engineering and Built Environment, School of Engineering, University of Newcastle, Callaghan, New South Wales 2308, Australia
    Search for more papers by this author

Abstract

Interaction between different toughening mechanisms is studied using a heat treated hybrid system, consisting of carboxyl-terminated butadiene acrylonitrile (CTBN) rubber and EXPANCEL (expandable hollow microspheres) as modifiers for an epoxy resin. It was found that the fracture toughness of the hybrid system is higher than that of either individually EXPANCEL- or CTBN-modified system for a given content of modifier, although the maximum toughness was not substantially high compared with maxima of single modifier systems. Microscopic examination revealed that damage zone due to CTBN particles ahead of the crack reduces due to the presence of EXPANCEL particles and nevertheless its fracture toughness increased. A possibility was deduced that the cavitation due to CTBN assists with promoting compressive stresses around EXPANCEL particles ahead of the crack tip, resulting in increase in fracture toughness. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 4470–4475, 2006

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