Structure of initial, ultimate and inner chain units of polybutadiene obtained with a rare-earth catalyst as revealed by C nuclear magnetic resonance spectroscopy |
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Authors: | K.D. Skuratov M.I. Lobach A.N. Shibaeva L.A. Churlyaeva T.V. Erokhina L.V. Osetrova V.A. Kormer |
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Affiliation: | S.V. Lebedev All-Union Synthetic Rubber Research Institute (VNIISK), 198035, St Petersburg, Russia |
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Abstract: | The structure of initial, ultimate and inner chain units in polybutadiene produced with NdCl3. 3(i-PrOH)---HAl(i-Bu)2was studied by means of 13C nuclear magnetic resonance spectroscopy. Initial units are shown to be predominantly of trans-CH3CH=CHCH2--- structure. Conversely, 90% of inner units have cis configuration. Ultimate units obtained by quenching with H2O (D2O) are predominantly of 1,2 structure. On the basis of the data obtained, the polymerization mechanism was discussed. |
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Keywords: | structure chain units polybutadiene rare-earth catalysis 13C nuclear magnetic resonance spectroscopy |
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