| Summary: | 碩士 === 中原大學 === 化學研究所 === 91 === In this study, poly(methyl methacrylate)(PMMA) / clay are prepared by in situ polymerization. We use the metallocene / MAO catalyst to prepare the PMMA/clay via coordinated polymerization to make silicate layer dispersing in the polymer. There are many polar groups in the silicate layer so we have to use the co-catalyst, MAO, support on the interlayer of clay to protect the functional groups and to avoid the catalyst be poisoned. Polymerization is processed with the catalyst, which is on the interlayer of clay, to be sure that polymeric chains grow between the layers of clay.Five catalysts were used in this study,discuss the condition of clay catain,reaction temp.,concentration of cocatalysts and the aging time.Molecular weight and Molecular weight distribution were measured by gel-permeation chromatography(GPC). The structure of the covalent bonds was Identified by Fourier-transform infared (FT-IR).The clay dispersion was measured by both X-ray diffraction And the thermal stability of nanocomposites were studied by differential scanning calorimetry(DSC) and thermogravimetric analysis (TGA).SEM micrograph of fractured surface of PMMA nanocomposites.
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