The influence of the catalyst preparation on the homo- and copolymerization of butadiene and isoprene

✍ Scribed by Annekatrin Oehme; Ulrich Gebauer; Klaus Gehrke; Peter Beyer; Brigitte Hartmann; M. Dieter Lechner

• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 381 KB
• Volume: 195
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1994.021951203

✦ Synopsis

Abstract

The catalyst system Nd(octanoate)~3~/Al~2~Et~3~Cl~3~/Al(iBu)~3~ (Et: ethyl, iBu: isobutyl) in heptane for the polymerization of butadiene and isoprene was examined. The concentration of Al~2~Et~3~Cl~3~, Al(iBu)~3~ and the order of addition of the components were varied. The results of the determination of conversion, microstructure, molar mass and molar mass distribution are illustrated. The optimum component concentration ratio (Nd(octanoate)~3~/Al~2~Et~3~Cl~3~/Al(iBu)~3~ = 1 : 1,5 : 25) at a catalyst concentration of 1,0 mmol Nd/L was fixed and used for the copolymerization of butadiene and isoprene. Copolymers obtained under various monomer feed ratios were characterized by ^1^H, ^13^C NMR spectroscopy, gel‐permeation chromatography (GPC), and differential scanning calorimetry (DSC) investigations.