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.
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Chu, CC., Lin, JJ., Shiu, CR. et al. Fine Dispersion and Property Differentiation of Nanoscale Silicate Platelets and Spheres in Epoxy Nanocomposites. Polym J 37, 239–245 (2005). https://doi.org/10.1295/polymj.37.239
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DOI: https://doi.org/10.1295/polymj.37.239