| Summary: | 碩士 === 萬能科技大學 === 工程科技研究所 === 95 === We use POSS and AGE to synthesize the octakis dimethylsilyloxy propyl glycidyl ether silsesquioxane (OG). The structure of OG has been confirmed through the analyses of 1H-NMR, 13C-NMR, FT-IR, and Raman spectroscopy. In addition, the nanocomposites from both DGEBA/OG/DDS and DGEBA/OG/UV series have been prepared. Based on the DSC and DMA results, the Tg of the DGEBA/OG/UV nanocomposite increases with increasing OG content in the nanocomposites. This is due to the presence of the POSS cages that is able to effectively hinder the motion of the network junctions. At T>Tg, the storage modulus of the OG/Epoxy nanocomposite is higher than that of the pure Epoxy due to the higher crosslink in the nanocomposite. According to the TGA results, the 5% weight loss temperature, T5, increases with increasing OG content in the nanocomposites, whereas the T5 decreases when the OG content is above 5%. This is due to the aggregation phenomenon for the nanocomposites with higher OG content. Furthermore, the ash content at 800℃ increases with increasing OG content in the nanocomposites. From the SEM and AFM analyses, the domain size of the OG is about 10-30 nm for the nanocomposite with lower OG content (2 phr). On the contrary, the domain size of the POSS becomes larger (20-60 nm) for the higher POSS content (10 phr). Additionally, a rough surface is fomnd in the higher OG content system
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