Abstract
13C NMR chemical shifts were determined for the methyl carbons in the various stereoisomers of polypropylene, taking into account the so called γ effect and Suter–Flory’s rotational isomeric state model. We assumed a polypropylene chain generated by two independent processes with the bi-catalytic sites model. Various NMR data on polypropylene were examined and all of which could be reasonably interpreted by this model, i.e. a part of the system is generated by selection between d and l configurations, and the remaining part, done by selection between meso (m) and racemo (r) additions. The controversial assignment of two resonances mmrm and rmrr in the literature is also discussed and clarified.
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Zhu, SN., Yang, XZ. & Chûjô, R. 13C NMR Chemical Shifts in Polypropylene and the Bi-Catalytic Propagation Mechanism in Polymerization. Polym J 15, 859–868 (1983). https://doi.org/10.1295/polymj.15.859
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DOI: https://doi.org/10.1295/polymj.15.859