Synthesis of reactor blend of linear and branched polyethylene using metallocene/Ni-diimine binary catalyst system in a single reactor

摘要: This work reports the synthesis of a series reactor blends linear and branched polyethylene materials using combination [1,4-bis(2,6-diisopropylphenyl) acenaphthene diimine nickel(II) dibromide] (1)/MMAO, known as an active catalyst for production polyethylene, [rac-ethylenebis(indenyl) zirconium dichloride] (2)/MMAO, which is polyethylene. The polymerization runs were performed at various levels temperature, pressure, 2 molar fractions. At 5°C, there was very low influence fraction on overall activity. However, 30°C 50°C, activity increased linearly with fraction. same dependency also found reactions carried out 60°C 100°C. temperature ethylene higher melting crystallinity observed increase in 100 psig, DSC thermograms polymers produced 1/2/MMAO exhibited two distinct peaks temperatures closely corresponding to individual catalysts, 1/MMAO 2/MMAO. GPCV analysis all samples showed monomodal molecular weight distributions polydispersities. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 2212–2217,