A difunctional 1,3-benzoxazine compound, 2,2′-(3-phenyl-4-dihydro-1,3,2-benzoxazine)propane (B-a), derived from bisphenol-A, 15N-enriched aniline, and formaldehyde was synthesized and characterized using 15N-NMR and 13C-NMR spectroscopies. The observed resonances in the solid-state 15N- and 13C-NMR spectra showed good agreement with the calculated chemical shifts which are based on the chemical structure. The B-a samples were cured at 150 and 200°C. The polymerization inspired peak intensity changes and line-width broadenings in the NMR spectra.
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Russell et al. (1998) studied this question.