Influence of Nano-alumina Particles on Glass Transition Temperature of High-performance Epoxy Resin
ZHANG Zong-hua1, LIU Gang2, ZHANG Hui3, ZHANG Zhong3, WANG Xiao-qun1
1. Materials Science & Engineering School, Beihang University, Beijing 100191, China;
2. Science and Technology on Advanced Composites Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China;
3. National Center for Nanoscience and Technology, Beijing 100190, China
Abstract：Alumina/epoxy composites were prepared by mechanical mixing technique. The effect of filler content and surface modification of the nano-alumina on the glass transition temperature (Tg) of epoxy composites was investigated. The result shows that the addition of micron-sized alumina particles does not change the Tg of epoxy polymer, but the unmodified nano-alumina affects the Tg of epoxy composites. There is a significant drop in Tg of the epoxy samples when the filler content is above 10% (mass fraction). At the filler content of 18%, the Tg of the nanocomposite sample declines by as much as 25℃ in comparison with that of the neat epoxy sample. Comparatively, the surface-modified nanoparticles have better compatibility with epoxy resin than the un-modified ones, and thus showing minor thickening effect.
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2014, Vol. 0 
