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Assignment of finely resolved13C NMR spectra of poly(vinyl alcohol)

Authors
Journal
Polymer
0032-3861
Publisher
Elsevier
Publication Date
Volume
42
Issue
24
Identifiers
DOI: 10.1016/s0032-3861(01)00536-5
Keywords
  • Poly(Vinyl Alcohol)
  • 13C Nmr Assignment
  • Polymerization Statistics

Abstract

Abstract 13C NMR spectra of three poly(vinyl alcohol)s differing in the stereoregularity (atactic, syndiotactic-rich and isotactic-rich) were determined in DMSO- d 6 and D 2O. The methylene and methine carbon absorptions including so far unassigned ones (mmmr heptad signals in mm-centered region and all heptad signals in mr-centered region) were completely assigned with hexads and heptads, respectively, and the assignments were quantitatively confirmed for atactic and syndiotactic-rich poly(vinyl alcohol)s. The isotactic-rich polymer showed a discrepancy between the observed and the calculated intensities, assuming the first-order Markov statistics, due to difficulty in determining its polymerization mechanism.

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