ETHYLENE/1-OCTENE COPOLYMERIZATION OVER GA-MODIFIED SIO2-SUPPORTED ZIRCONOCENE/MMAO CATALYST USING IN SITU AND EX SITU IMPREGNATION METHODS
作者： Bunjerd Jongsomjit , Mingkwan Wannaborworn
DOI:
关键词: Copolymer 、 In situ 、 Materials science 、 Ethylene 、 1-Octene 、 Adsorption 、 Lewis acids and bases 、 Polymer chemistry 、 Nuclear chemistry 、 Polymerization 、 Catalysis
摘要: Ethylene/1-octene copolymerization over the SiO 2 -supported zirconocene/MMAO catalysts was investigated. The silica support modified by different batches of 1.0 and 0.2 wt% Ga. It found that Ga well-dispersed all granules which cannot be detected XRD. Based on EDX measurement, it revealed Ga-modification increased adsorption ability MMAO after impregnation. Thus, showed a promising way to enhance rate ethylene/1-octene copolymerization. TGA study, lower interactions between caused another reason for increase in catalytic activity. Moreover, Lewis acid centres or active species system. In addition, comparative study polymerization also conducted with situ ex impregnation methods. method onto exhibited remarkable (almost 3 times) activity compared is attributed deactivation effect catalyst. 13C NMR analysis, however, indicated only random copolymers were produced systems. These results could related high degree 1-octene insertion thus amorphous
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