Epoxy composites reinforced by different size silica nanoparticles |
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Authors: | Cheng‐Fang Ou Ming‐Chin Shiu |
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Affiliation: | Department of Chemical and Materials Engineering, National Chin‐Yi University of Technology, Taichung County 411, Taiwan, Republic of China |
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Abstract: | Three series of epoxy/SiO2 composites, containing 0.3–7 wt % nanosized SiO2 with different specific surface area, were prepared by solution blending. The resulting composites exhibit the higher glass transition temperature (Tg) than that of pure epoxy. The Tg of composite showed a maximum increment of 35.3°C by the addition of 7 wt % A300. The trade name of A300 is Aerosil 300. It is one of the fumed silica nanoparticles products of Degussa. The decomposition temperatures (Td) of composites were always higher than that of pure epoxy and showed a maximum increment of 20.8°C by the addition of 5 wt % A300. The light transmittance of composites was as a function of the SiO2 content and size. The water permeability of composites decreased with increasing SiO2 content and the 7 wt % A300 composite exhibits a maximum decrement percentage of 35.6%. The Tg, Td, storage modulus, and water‐vapor barrier property are as a function of the SiO2 content and size. These properties increased as the content of SiO2 increased. The finer SiO2 are more effective in increasing the Tg, Td, and water‐vapor barrier property. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 |
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Keywords: | epoxy composites morphology transmittance water permeability |
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