Studies on ethylene/1-hexene copolymerization over the zirconocene catalyst supported on MAO-modified MgCl2(THF)2.
The effect of copolymerization conditions on catalyst activity and copolymer properties
Polimery 2002, No 1, 59
The activity of a MgC12(THF)2/MAO/Cp2ZrC12/MAO catalyst was studied in copolymerization of ethylene with 1-hexene in relation to Al:Zr mole ratio (1500—7000 at 50 °C), experimental temperature (20—70 °C), and time (20—90 min at 50 °C; 10—55 min at 65 °C). As the temperature and the Al:Zr ratio were increased, the activity of the catalyst rose. At the same time, the degree of incorporation of 1-hexene into the polymer chain increased and the M, melting point and crystallinity of the copolymer decreased. The catalyst was stable throughout the copolymerization. The process rate and copolymer properties were not affected by copolymerization time.
Keywords: copolymerization of ethylene with 1-hexene, supported zirconocene catalyst, catalyst activity, copolymerization conditions, copolymer properties