Microstructure of poly(lactide). Phase-sensitive HETCOR spectra of poly(meso-lactide), poly(rac-lactide), and atactic poly(lactide)

Malcolm H. Chisholm, Suri S. Iyer, David G. McCollum, Martin Pagel, Ulrike Werner-Zwanziger

Research output: Contribution to journalArticle

61 Scopus citations

Abstract

We report the synthesis and 1H, 13C{1H}, and phase-sensitive HETCOR NMR spectra of atactic poly(lactide), poly(meso-lactide) and poly(rac-lactide). The new and existing spectroscopic data are discussed in terms of four alternative explanations: (i) Kricheldorfs tetrad assignments with the presumption that the adjacent chiral units exert an asymmetric influence on chemical shifts which is propagated in opposite directions along the polymer chain for 1H and 13C nuclei, respectively, (ii) alternative tetrad assignments we have recently proposed, (iii) assignments based on pentad stereosequences, and (iv) assignments based on the observation of triad and pentad stereosequences rather than tetrads. We show that the available data are insufficient to unequivocally distinguish between explanations i or iv.

Original languageEnglish (US)
Pages (from-to)963-973
Number of pages11
JournalMacromolecules
Volume32
Issue number4
DOIs
StatePublished - Jan 1 1999

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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