Copolymerization of ethylene–1-Hexene over a thermally pretreated MgCl2/THF/TiCl4 bimetallic catalyst

✍ Scribed by Young Soo Ko; Taek Kyu Han; Je Woo Park; Seong Ihl Woo

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 294 KB
• Volume: 35
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19970930)35:13<2769::aid-pola22>3.0.co;2-8

✦ Synopsis

MgCl 2 /THF/TiCl 4 (TT-0) were thermally pretreated at 80ЊC for 5 min (TT-1) and 60 min (TT-2), and at 108ЊC for 5 min (TT-3) and 60 min (TT-4). These thermally pretreated catalysts showed comonomer enhancement effects in the ethylene-1-hexene copolymerization, while TT-0 catalyst did not. Comonomer enhancement effect of thermally pretreated catalysts could come from the generation of new active sites and change of its nature after heat treatment. 1-Hexene content in copolymer obtained with TT-1 was higher than those of TT-4 and TT-0. The morphology of homopolyethylene (PE) obtained with TT-1, 2, 3, and 4 was more regular and homogeneous than that of TT-0. This result could be due to the generation of active sites and change of its nature after thermal treatment of bimetallic catalyst.