| Summary: | 碩士 === 國立高雄應用科技大學 === 化學工程系碩士班 === 92 === The organic-inorganic hybrid nanocomposites of cyanate ester/silica were successfully prepared by two approaches in this study. One approach was the sol-gel process with cyanate ester (Part I). Another was the melting intercalation process (Part II).
In Part I, the silica were prepared by the hydrolysis and condensation of methyltrimethoxysilane(TMOS),3-Glycidoxypropyltrimethoxysilane(GPOS) and 2-(3,4-Epoxycyclohexyl)ethyltrimethoxysilane (ECOS) as precursors. Meanwhile, ECOS and GPOS were also used as coupling agents in systems. The results show that when silica content was lower than 4 wt% in the hybrid, the particles sizes of silica was lower than 100 nm. Nevertheless, the particles sizes of silica can be controlled by adding coupling agent in system. The thermal and dielectric properties of cyanate ester were obviously improved with silica embedded. Photoluminescence studies of those nanocomopsites demonstrated that the blue shift phenomena were observed with the incorporation of the coupling agents.
In Part II, montmorillonite clays modified with the cetylpyridinium chloride (CPC) and glycidyltrimethyl ammonium chloride (GTAC) were used to prepare the cyanate ester/clay hybrid nanocomposites. The results showed that CPC treated montmorillonite is exfoliated by the cyanate ester, even up to 10 phr loading of the clay. The thermal properties of cyanate ester/clay hybrid nanocomposites in the GTAC treated montmorillonite systems were better than those in the CPC treated montmorillonite system, because that the chemical bonding arises between the GTAC and cyanate ester. In this paper, we are also successfully to control the morphology (exfoliated or intercalated structure) of cyanate ester/clay hybrid nanocomposites via the different melt viscosity by varying the different levels of conversions of cyanate ester.
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