Abstract
The conformational probabilities for highly isotactic polypropylene involving various types of stereodefects were calculated. They are effected not only by the dyad in which the defects are present but also by that in neighboring sites. By taking the γ effect and conformational probabilities into account, chemical shift differences were calculated for methyl and methine carbons. From the chemical shift calculations, assignments due to stereodefects were performed for all peaks observed in both methyl and methine carbon resonance regions of the polypropylene spectrum.
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Zhu, SN., Asakura, T. & Chûjô, R. Carbon-13 NMR Analysis of Stereodefects in Highly Isotactic Polypropylene by Calculation of Chemical Shifts. Polym J 16, 895–899 (1984). https://doi.org/10.1295/polymj.16.895
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DOI: https://doi.org/10.1295/polymj.16.895