The structure of initial and ultimate chain units in polybutadiene and polyisoprene was studied by means of 2H nuclear magnetic resonance spectroscopy. Polydienes were prepared with a neodymium catalyst; quenching was performed with deuteromethanol. The enrichment of quenched ultimate units by trans-l,4 structures at the expense of cis-l,4 structures at high polymer yields was observed. When using diisobutylaluminium deuteride DAI(i-Bu)2, as chain transfer agent, it was shown that the principal site of chain transfer reaction was the A1 D bond. The initial unit of polybutadiene was predominantly of trans-l,4 structure.
Посилання на статтю:
Structure of initial and ultimate chain units of polydienes obtained with rare-earth catalysts as revealed by 2H nuclear magnetic resonance spectroscopy / K. D. Skuratov, M. I. Lobach*, A. N. Shibaeva, L. A. Churlyaeva,T. V. Erokhina, L. V. Osetrova and V. A. Kormer // Polymer. – 1992. – Vol 33. – P. 5197-5201.