Abstract
The catalyst system Nd(acac)3·2 H2O/Bu2Mg/CHCl3 shows a fairly high activity in both the homo- and copolymerization of isoprene (IP) and styrene (St) in toluene at 60°C. Copolymers obtained from various comonomer feed ratios were characterized by means of NMR spectroscopy and gel-permeation chromatography. The polyisoprene and poly(IP-co-St) obtained predominantly consist of cis-1,4 IP units. Monomer reactivity ratios were evaluated to be rIP = 5.4 and rSt = 0.38 in the copolymerization.
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