| Summary: | 碩士 === 東海大學 === 化學工程學系 === 92 === This research adopts the technique of in-situ solution polymerization to synthesize the PBMA/organo-clay and PS/organo-clay nanocomposite. The thermal properties of the obtained nanocomposites are characterized by TGA、DSC and DMA. The nanostructore was observed by XRD and TEM. Their melt rheological properties are measured and analyzed using a rheometer of rotational type（RDA II）and a capillary rheometer. All the material properties could be interpreted by the nanostructure revealed by XRD patterns and TEM micrographs.
The results of this study are summeried as follows. The thermal decomposition temperature of this two systems are increased obviously by the addition of montmorillonite. The glass transition temperatures of both systems were rised with the amount of organo-clay in DSC analysis, and we found the same trend in DMA analysis. The XRD profiles showed, the peaks of nanostructure shifted to lower angles, and annealing temperature affected the dispersion of PBMMT as shown in TEM micrographs. In the rheological behavior, we found that shear viscosity increased with the concerntration of filler. Moreover, the higher is the cencerntration of the filler, the more obvious is the shear-thinning behavior. In the dynamic rheological tests, level-off storage modulus appears in low frequencies for nanocomposites. Finally, we found that the annealing temperature changed the nanostructure, and further affected the dynamic rheological behavior in low frequencies for nanocomposites.
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