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Graphene Oxide (GO) was prepared and dispersed in DER 332 epoxy. Preliminary work using Broadband Dielectric Spectroscopy (BDS) has shown that the epoxy and its composite could start to degrade at temperature as low as 120°C. Thermogravimetric analysis measurement indicated a slight mass loss difference at 150°C between samples with and without GO. Both samples as produced were initially post-treated...
This work is concerned with hybrid nanocomposite materials that contain both clay and graphite oxide incorporated in an epoxy matrix. In order to assess the challenge of improving the thermal conductivity while not changing or even improving the electrical properties, a new composite system was designed by applying an additional thermal conductive phase represented by the graphite oxide. In this paper,...
In the recent years, graphene studies have increased rapidly. Graphene oxide (GO), which is an intermediate product to form graphene, is insulating and it should be thermally reduced to be electrically conductive. In this work, we have described an attempt to change the insulating properties of GO by changing their pH. GO powder has been synthesized and modified to maintain pH=3 by wash process. Microstructure...
Thermoset polymers are frequently used as matrices for nanocomposite materials because nanofillers, such as clay, can be easily incorporated into liquid polymer precursors. Since in the crystal structure of clay such as Montmorillonite the layers are physically linked by cations, replacing these cations with larger organophilic molecules changes the clay surface into hydrophobic and increases the...
The purpose of this work is to demonstrate the post-treatment importance using dielectric measurements on nanocomposites. During this post-treatment which is the application of heat over time, crosslinking completes and ageing sets in. Both effects usually take place in the same time. Besides the expected differences between the filled and unfilled epoxy samples, the influence of silane coupling agents...
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