TEMPERATURE PROGRAMMED DECOMPOSITION OF SILLICA - SUPPORTED MgCl2/THF/TiCl4 CATALYST AND EFFECT OF THERMAL TREATMENT ON ETHYLENE POLYMERIZATION RATE

다국어 초록 (Multilingual Abstract)

Silica supported MgCl₂/THF/TiCl₄catalyst (SiO₂/MgCl₂/THF/TiCl₄) was prepared, and then decomposed thermally. The amount of produced gas [tetrahydrofuran (THF) and 1,4-dichlorobutane (DCB)] was measured with gas chromatography (GC) and mass spectrometer. SiO₂/MgCl₂/THF/TiCl₄catalyst started to decompose around 85℃, and further decomposed at 113, 150 and 213℃. THF was mainly produced, but very small amount of DCB evolved during temperature programmed decomposition (TPD), while unsupported MgCl₂/THF/TiCl₄produced DCB significantly. Polymerization rate of ethylene with SiO₂/MgCl₂/THF/TiCl₄decreased when it was preheated at 85 and 110℃ for 5 and 60 min, respectively, while that of unsupported MgCl₂/THF/TiCl₄increased after same pretreatment condition. It can be suggested that Mg/Ti bimetallic complex anchored on the surface of silica through OH group of it has weak interaction between Mg and Ti species.