Polymerization of ethylene and ethylene/1-hexene over Ziegler–Natta/metallocene hybrid catalysts supported on MgCl2 prepared by a recrystallization method

✍ Scribed by Han Seock Cho; Jin Suk Chung; Jae Hyuck Han; Young Gwan Ko; Wha Young Lee

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 216 KB
• Volume: 70
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19981128)70:9<1707::aid-app8>3.0.co;2-#

✦ Synopsis

MgCl 2 for use as a catalyst support was prepared by dissolution in methanol and recrystallization in n-decane, followed by vacuum-drying at 2,000 rpm. The prepared support was modified by treatment with alkylaluminum compounds. The activity profile of ethylene over the supported catalysts persisted for periods up to 1 h during the polymerization. The prepared Ziegler-Natta/metallocene hybrid catalysts exhibited the characteristics of both metallocene and Ziegler-Natta catalysts. The polymer produced by the hybrid catalysts gave bimodal peaks in differential scanning calorimetry analysis for ethylene and ethylene/1-hexene polymerization, suggesting that the polymer was composed of two different lamellar structures that were polymerized by each catalyst.