Propylene-ethylene copolymerization catalyzed by metallocene catalyst
Bridged metallocene catalyst was used as the main catalyst to explore the effects of process conditions such as cocatalysts,polymerization temperature,comonomer concentration,n(Al)∶n(Zr)and n(B)∶n(Zr)on propylene-ethylene copolymerization and polymer structure and properties.The process parameters of intermittent solution polymerization were optimized to prepare propylene-ethylene random copolymer with the highest activity of 2.05×107 g/(mol·h).The optimal process conditions of solution polymerization are as follows:the temperature is 70℃,n(Al)∶n(Zr)=150,n(B)∶n(Zr)=1.5.
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