Improved Peak Assignments for the ¹³C NMR Spectra of Poly(ethylene-<i>co</i>-1-octene)s

Abstract

High field NMR instruments and multidimensional NMR spectra have substantially improved our ability to assign 13C NMR chemical shifts of the microstructures of polyolefins including poly(ethylene-co-1-octene). However, simple principles of quantitative NMR still need to be obeyed, such as three α methylene carbons for each methine in the EOE triad. We applied these principles to the-state-of-art peak assignments for poly(ethylene-co-1-octene). A couple of errors were identified as well as some ambiguous assignments. These findings were incorporated into a rigorous and systematic new assignment for the resonances of the polymer.