| Summary: | 碩士 === 東海大學 === 化學工程與材料工程學系 === 97 === The purpose of this thesis is to study ethylene polymerization and co-polymerization catalyzed by Me2Si(Ind)2ZrCl2/SiO2.The catalyst was prepared by impregnation method. The polymerization was carried out in a slurry reactor. We studied the effects of support types, reaction temperature and α-olefin types on polymer yield. We characterized the catalysts and the polymers with a variety of techniques, including DSC, GPC, FESEM, XRD, FTIR, OM, and ICP-AES.
We found that 60℃ was the best reaction temperature where HDPE and LLDPE had the best yield. For catalysts with micro-sized(surface area of 300m2/g)and nano-sized，the nano-sized catalyst had better performances. The increase of α-olefin concentration increased the LLDPE product yield. SEM showed that the silky structure of HDPE and LLDPE became more significant with the increase reaction temperature. XRD showed that the XRD intensity of HDPE increased with increasing reaction temperature. But XRD intensity of LLDPE decreased with increasing reaction temperature. HDPE product with the lowest temperature had the highest molecular weight. LLDPE produced with adding 1.8ml α-olefin had the best molecular weight. The catalyst with nanometer size had the best product yield and the best physical and chemical characteristics.
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