Preparation of linear low-density polyethylene from ethylene by tandem catalysis of iron and titanium non-metallocene catalysts
作者： Guangyong Xie , Xiang Zhang , Tingcheng Li , Long Li , Gongyi Liu
DOI: 10.1016/J.MOLCATA.2013.11.024
关键词: Chemistry 、 Linear low-density polyethylene 、 Ethylene 、 Polymer chemistry 、 Catalysis 、 Differential scanning calorimetry 、 Polyethylene 、 Branching (polymer chemistry) 、 Polymer 、 Crystallinity
摘要: Abstract A non-metallocene titanium complex of β-carbonylenamine derived [O − NS]TiCl 3 ( 2 ), which can form a tandem catalytic system with difluoro-substituted 2,6-bis(imino)pyridyl iron 1 was firstly used as in situ copolymerization catalyst to prepare linear low-density polyethylene (LLDPE) ethylene the sole monomer stock and MMAO only cocatalyst. During reaction, /MMAO oligomerized α-olefins high activity selectivity, while copolymerized generated LLDPE (up 6 × 10 6 g/mol Ti h atm). The influences reaction conditions upon polymer structures properties have been researched. polymers were characterized by differential scanning calorimetry (DSC), temperature gel permeation chromatography (GPC) 13 C NMR spectroscopy proved be ethyl, butyl well longer branches. branching degrees tuned efficiently from 4.6 39.3/1000C different such temperature, Fe/Ti molar ratio Al/(Fe + Ti) ratio. melting points, degree crystallinity molecular weights also changed correspondingly conditions.
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