Synthesis of α,ω-dialkenyl isotactic poly(propylene) using bis(4-methyl-3-pentenyl)zinc as a chain transfer reagent

✍ Scribed by Hiroki Kurosawa; Takeshi Shiono; Kazuo Soga

• Book ID: 102483523
• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 283 KB
• Volume: 195
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1994.021951002

✦ Synopsis

Abstract

Propene polymerization was conducted with the catalyst system composed of TiCl~3~ and bis(4‐methyl‐3‐pentenyl)zinc (BMPZ) in the absence or presence of Al(C~2~H~5~)~2~Cl. The catalyst system with or without Al(C~2~H~5~)~2~Cl gave isotactic poly(propylene) (PP) with a lower molecular weight as compared to the TiCl~3~/Al(C~2~H~5~)~2~Cl system. From the ^1^H and ^13^C NMR analyses, it was found that the polymer produced with the TiCl~3~/BMPZ catalyst possesses a 2,6‐dimethyl‐5‐heptenyl group and a Zn‐PP bond at the initial and terminal ends, respectively. The Zn‐terminated end was then converted to a vinyl group by coupling with allyl bromide in the presence of N‐methylimidazole to obtain isotactic PP having CC double bonds at both chain ends.