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- W2023378166 abstract "The mechanism of stereospecific polymerization of propylene (catalysed by a modified Ziegler-Natta system, TiCl4/MgCl2/C6H5COOC2H5/Al(C2H5)3), has been analysed using the values of triad and pentad tacticity determined using 125 MHz 13C n.m.r. spectroscopy. The well-known single active-site models, such as the Bernoullian, first- and second-Markovian, and enantiomorphic models, were found to be inadequate to describe the observed tacticity. A two-sites model, in which at one site the stereospecific polymerization proceeds in obedience to the Bernoullian model and at the other proceeds under the control of enantiomorphic-site model, is proposed. It was found that the pentad tacticities of both soluble and insoluble (in boiling heptane) fractions of polypropylene agreed well with the two-sites model." @default.
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- W2023378166 date "1984-11-01" @default.
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- W2023378166 title "Studies of the stereospecific polymerization mechanism of propylene by a modified Ziegler-Natta catalyst based on 125 MHz 13C n.m.r. spectra" @default.
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- W2023378166 doi "https://doi.org/10.1016/0032-3861(84)90160-5" @default.
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