| Summary: | 碩士 === 國立中興大學 === 材料工程學研究所 === 88 === Abstract
The preparation of styrene-acrylonitrile/MMT nanocomposite was done by quasi-emulsion polymerization in adsorbed cetyl trimethylammonium bromide (CTAB) micelles on MMT. Various amounts of MMT in SAN/MMT nanocomposites were prepared. The samples were analyzed by XRD、TGA to obtain d-spacing of MMT and content of MMT. The low MMT content SAN/MMT composites were prepared by two methods. One is by bulk polymerization, the other is done in a Brabender mixer. The measured E'、E'' and tanδ of SAN/MMT nanocomposites by Dynamic Mechanical Analyzer was compared with those of pure SAN copolymer. Then, XRD、TEM were employed to observe the d-spacing and dispersion of MMT in SAN matrix. Results show that the SAN/MMT nanocomposites can be prepared by bulk polymerization and melt blending. And, MMT was dispersed in SAN uniformly. The storage modulus (E') of SAN/MMT composites are higher than those of pure SAN with an increase percentage of 72 % and 61 % , respectively. Both the d-spacing of the SAN/MMT nanocomposites were measured to be greater than 200~300 nm from TEM. In this study, we have successfully prepared SAN/MMT nanocomposites with mechanical properties improved by MMT reinforcement.
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