High-resolution 13C and 1H solution NMR study of poly(lactide)

Khalid A.M. Thakur, Robert T. Kean, Eric S. Hall, Jeffrey J. Kolstad, Tim A. Lindgren, Matthew A. Doscotch, J. Ilja Siepmann, Eric J. Munson

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227 Scopus citations

Abstract

High-resolution 500 MHz solution-state 1H and 13C NMR spectra of various poly(lactides) indicate at least hexad stereosequence sensitivity. The poly(lactides) were prepared in vials by melt polymerization of various combinations of L-lactide, D-lactide, and meso-lactide at 180°C for 3 h using tin(II) bis(2-ethylhexanoate) (tin(II) octoate) as the catalyst in a 1:10 000 ratio. The intensity distribution of the various stereosequence resonances in the NMR spectra indicates a preference for syndiotactic addition during the polymerization process. Minimal evidence of transesterification was observed for these polymerization conditions.

Original languageEnglish (US)
Pages (from-to)2422-2428
Number of pages7
JournalMacromolecules
Volume30
Issue number8
StatePublished - Apr 21 1997

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