Abstract
The chemical shifts of the methyl, methylene, and methine protons were calculated with respect to the 31 helix, and the (–(tt)–) and (–(tt)(g′g′)(tt)–) conformations of isotactic and syndiotactic polypropylenes, respectively, on the assumption that the chemical shifts are mainly due to the contribution from the C-C bond aniso-tropies of the main and side chains. The latter is taken as the function of the number of successive monomer units and the deviation of the bond rotation angle ΔΨ from the typical trans and gauche positions. It was found that the calculated chemical shifts for each group appear in the same order as the ones observed with increasing field.
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Ando, I., Nishioka, A. Magnetic Anisotropy Effect on the Chemical Shift of Polypropylene. Polym J 2, 161–172 (1971). https://doi.org/10.1295/polymj.2.161
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DOI: https://doi.org/10.1295/polymj.2.161
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