Copolymerization of ethylene and 1-dodecene catalyzed by novel low-Ti-loading Ziegler–Natta catalysts and their microstructures

✍ Scribed by Zhenrong Zhao; Li Wang; Jianfeng Wang; Xiaochen Dong; Haojie Yu

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 280 KB
• Volume: 104
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.25756

✦ Synopsis

Abstract

Ethylene–1‐dodecene copolymers were synthesized with novel low‐Ti‐loading (0.8 wt %) Ziegler–Natta catalysts prepared by a one‐pot balling method. ^13^C‐NMR was applied for the quantitative determination of the composites and microstructures of the resultant ethylene–1‐dodecene copolymers. The results showed that (1) the ethylene–1‐dodecene copolymers obtained from both the MgCl~2~‐supported low‐Ti‐loading Ziegler–Natta catalyst and the MgCl~2~/SiO~2~‐bisupported low‐Ti‐loading Ziegler–Natta catalyst at a 0.6__M__ 1‐dodecene concentration had high levels of 1‐dodecene and (2) most of the 1‐dodecene units were separated by ethylene units in the copolymer chains obtained from the MgCl~2~‐supported low‐Ti‐loading Ziegler–Natta catalyst, whereas there were some continuous 1‐dodecene repeat units in the copolymer chain obtained from the MgCl~2~/SiO~2~‐bisupported low‐Ti‐loading Ziegler–Natta catalyst. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 1200–1204, 2007