Alternating copolymer of butadiene and ethylene. I. Copolymerization by TiCl4–R3Al catalyst systems

✍ Scribed by Furukawa, Junji ;Hirai, Ryuichi

• Publisher: Wiley (John Wiley & Sons)
• Year: 1972
• Tongue: English
• Weight: 451 KB
• Volume: 10
• Category: Article
• ISSN: 0449-296X
• DOI: 10.1002/pol.1972.170101020

✦ Synopsis

Abstract

Alternating copolymerization of butadiene and ethylene was investigated by the TiCl~4~−R~3~Al system as catalyst with the use of toluene solutions of monomers of various compositions or by introducing a 1:1 gaseous mixture of both monomers into the reaction system. It was found that the copolymer composition is much influenced by the monomer composition or by the flow rate of monomer. Copolymers containing sequences of alternating monomer arrangement are formed by the polymerization of a monomer mixture having a butadiene: ethylene ratio of 4:1. A suitable catalyst for the alternating copolymerization was found to consist of R~3~Al−TiCl~4~ at a ratio of 2. The addition of amine was found to modify the catalyst to favor the alternating copolymerization but was accompanied by a decrease in catalyst activity.