Stereochemical Pseudohexad 13C NMR Resonances and Regioregular Propylene/Ethylene-1-13C Copolymers

✍ Scribed by Irene Sessa; Dino Romano Ferro; Fabia Grisi; Dario Liguori; Giuseppe Milano; Adolfo Zambelli

• Book ID: 102485557
• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 218 KB
• Volume: 203
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200290044

✦ Synopsis

Abstract

This paper reports the assignment of the ^13^C NMR resonances of the S~ββ~ and S~αγ~ methylenes observed in the spectra of copolymers of propylene with trace amounts of enriched ethylene‐1‐^13^C. The assignment is achieved by comparing the chemical shifts calculated by an empirical method (at the CH~2~ stereochemical pseudohexad level), with the experimental spectra of regioregular copolymers with different stereochemical structure. The implications of the observed S~ββ~ and S~αγ~ resonances on the stereochemical polymerization mechanisms are also discussed.
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