Fine Dispersion and Property Differentiation of Nanoscale Silicate Platelets and Spheres in Epoxy Nanocomposites

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  • Chu Chien-Chia
    Department of Chemical Engineering, National Chung Hsing University
  • Lin Jiang-Jen
    Department of Chemical Engineering, National Chung Hsing University
  • Shiu Chang-Ru
    Department of Chemical Engineering, National Chung Hsing University
  • Kwan Chang-Chin
    Department of Applied Chemistry, Providence University

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Abstract

Silica spheres (with an averaged diameter of 10 nm) and silicate platelets (approximately 100×100×1 nm3 in dimension) were allowed to disperse in polyoxypropylene-triamine (400 g/mol molecular weight), then cured with the epoxy resin diglycidyl ether of bisphenol-A (DGEBA). With 1–5 wt % loading of these inorganic silicates, the cured epoxies exhibited high hardness, transparency, and a low thermal expansion coefficient. These silicate platelets also enhance the epoxy hardness from the pristine 2H to 4H while adding only 0.5 wt %. By comparison, if the spherical silica is used, a similar hardness can only be achieved by loading as high as 5 wt % of the silica. The high aspect-ratio and fine dispersion of the platelet silicates were found to be important factors in influencing the cured epoxy’s properties. In addition, a TEM micrograph shows that the silicate platelets are well-dispersed and have a unique self-arranged lamellar orientation.

Journal

  • Polymer Journal

    Polymer Journal 37 (4), 239-245, 2005

    The Society of Polymer Science, Japan

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