Natural Abundance 15N CP/MAS NMR of Nylons. A Sensitive Technique for Evaluating Crystalline Composition and Conformation in Solid Polyamides

Abstract

Solid state nitrogen (nuclear magnetic resonance) NMR spectra (at nitrogen natural abundance) were obtained on several polyamides of previously- identified crystalline composition. Characteristic peaks wre seen for amide units in alpha-crystalline domains at 83 to 85 ppm in ppm downfield from glycine. Peaks for the gamma-form domains were seen at 88 to 90 ppm. Most interesting was the appearance of additional peaks between these two peaks which apparently correspond to amide conformations in intermediate crystalline forms and/or amorphous regions. Initial results are consistent with peak intensities correlating well with crystal composition, suggesting that this may be a quantitative as well as qualitative method for determining crystallinity in nylons.

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Document Details

Document Type
Technical Report
Publication Date
Jul 15, 1988
Accession Number
ADA197617

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  • Allison M. Sikes
  • Douglas G. Powell
  • Lon J. Mathias

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  • University of Southern Mississippi

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