Kinetik der Wachstumsreaktionen der Copolymerisation von Butadien und Styrol mit Lithiumorganylen

The rate constants of the propagation reactions of the lithiumalkyl catalyzed copolymerization of butadiene and styrene in toluene were measured and their rate constants and activation energies and the association constants of the initiators were determined. It turned out, that the cross reaction of styryllithium with butadiene is faster by a factor of 100 as hitherto assumed. The problems in determining rate constants from copolymerization reactivity ratios are discussed.