Determination of the extent of reaction of amine cross-linked epoxy resins by solid-state 13C and 15N NMR

Matthew E. Merritt, Laurent Heux, Jean Louis Halary, Jacob Schaefer

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Abstract

The chemical substitution of amine nitrogens in cured, 15N-labeled epoxy resins has been determined by a combination of rotational-echo double-resonance 13C NMR and dipolar rotational spin-echo 15N NMR. Amine-nitrogen substitution is at least 90% (that is, no more than 10% of all nitrogens have a directly bonded hydrogen) for resins formed from stoichiometric amounts of epoxide and either hexamethylenediamine or a 1:3 molar mixture of hexamethylenediamine and hexylamine. This direct measure of curing and cross-linking is consistent with indirect Fourier-transform infrared estimates of curing based on the disappearance of the deformation band of the epoxide ring.

Original languageEnglish (US)
Pages (from-to)6760-6763
Number of pages4
JournalMacromolecules
Volume30
Issue number22
StatePublished - Nov 3 1997

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ASJC Scopus subject areas

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

Cite this

Merritt, M. E., Heux, L., Halary, J. L., & Schaefer, J. (1997). Determination of the extent of reaction of amine cross-linked epoxy resins by solid-state 13C and 15N NMR. Macromolecules, 30(22), 6760-6763.