A Study of Copolymerization of 1-Hexene with 2,5-Norbornadiene Using Metallocene Catalysts

✍ Scribed by Mallinamadugu J. Yanjarappa; Swaminathan Sivaram

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 135 KB
• Volume: 205
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200400209

✦ Synopsis

Abstract

Summary: Copolymerization of 1‐hexene with a symmetrical diene, namely 2,5‐norbornadiene was studied using four different metallocene catalysts. Copolymerization was found to occur exclusively through one of the two equally reactive endocyclic double bonds with all the four catalysts. Copolymerization results in low molecular weight oligomers with the number average molecular weight ($\overline M _{\rm n}$) varying from 1 000–3 000. End group analysis of the co‐oligomers revealed that the β‐hydrogen transfer after 2,1 insertion also occurs in the presence of highly regiospecific catalysts. The regio errors were also found to depend on various reaction parameters such as polymerization time, Al/Zr mol ratio, metallocene concentration and polymerization temperature.

Plots of variation in end groups and NBD incorporation with time.

magnified imagePlots of variation in end groups and NBD incorporation with time.