Abstract
13C NMR spectra of isolated ethylene units in [1,2-13C] enriched ethylene-propylene copolymer prepared with syndiotactic-specific catalyst were observed. The use of [1,2-13C] enriched ethylene units made it possible to determine the fractions of three kinds of the structures, mEm, mEr, rEr where m means meso propylene dyad, E isolated ethylene unit and r racemo propylene dyad in the copolymer. This is based on change in the NMR spectral pattern depending on the relative magnitude between 13C-13C coupling constant and chemical shift difference.
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Asakura, T., Nishiyama, Y., Doi, Y. et al. C-13 NMR Analysis of Isolated Ethylene Units in Ethylene-Propylene Copolymer. Polym J 19, 829–837 (1987). https://doi.org/10.1295/polymj.19.829
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DOI: https://doi.org/10.1295/polymj.19.829
