Melt rheological properties of branched polyethylenes produced with Pd/Ni diimine catalysts
writer：Z. Ye, S. Zhu*
keywords：Branched polyethylene, Chain topology, Chain walking polymerization, Hyperbranched, Rheology
source：期刊
specific source：Macromolecular Chemistry and Physics
Issue time：2004年
A tandem catalytic system, composed of (η5‐C5H4CMe2C6H5)TiCl3 (1)/MMAO (modified methyl aluminoxane) and [(η5‐C5Me4)SiMe2(tBuN)]TiCl2 (2)/MMAO, was applied for the synthesis of ethylene–hex‐1‐ene copolymers with ethylene as the only monomer stock. During the reaction, 1/MMAO trimerized ethylene to hex‐1‐ene, while 2/MMAO copolymerized ethylene with the in situ produced hex‐1‐ene to poly(ethylene–hex‐1‐ene). By changing the catalyst ratio and reaction conditions, a series of copolymer grades with different hex‐1‐ene fractions at high purity were effectively produced.