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

The catalyst system Nd(octanoate)3/Al2Et3Cl3/Al(iBu)3 (Et: ethyl, iBu: isobutyl) in heptane for the polymerization of butadiene and isoprene was examined. The concentration of Al2Et3Cl3, Al(iBu)3 and the order of addition of the components were varied. The results of the determination of conversion,...

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Veröffentlicht in:	Macromolecular chemistry and physics 1994-12, Vol.195 (12), p.3773-3781
Hauptverfasser:	Oehme, Annekatrin, Gebauer, Ulrich, Gehrke, Klaus, Beyer, Peter, Hartmann, Brigitte, Lechner, M. Dieter
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Copolymerization Exact sciences and technology Organic polymers Physicochemistry of polymers Preparation, kinetics, thermodynamics, mechanism and catalysts
Online-Zugang:	Volltext
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Zusammenfassung:	The catalyst system Nd(octanoate)3/Al2Et3Cl3/Al(iBu)3 (Et: ethyl, iBu: isobutyl) in heptane for the polymerization of butadiene and isoprene was examined. The concentration of Al2Et3Cl3, 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/Al2Et3Cl3/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 1H, 13C NMR spectroscopy, gel‐permeation chromatography (GPC), and differential scanning calorimetry (DSC) investigations.
ISSN:	1022-1352 1521-3935
DOI:	10.1002/macp.1994.021951203