Epoxy solid-state spectra

Figure 1, Solid state C-13 NMR spectra (obtained at 37.7 MHz) of the cured epoxy resins with BDMA, after 1 hour curing, after 8 hours of curing. At top is the spectrum of the 1-hour cured sample under solution spectrometer conditions.

Figure 9.3 shows a solid-state C-CP/MAS NMR spectrum for a silane-modified (1.4 GPTMS per nm silica surface) silica dispersion. The inset in the figure shows the molecular structure of the moiety covalently linked to the silica surface. A diol has been formed in the production process as indicated by the chemical shifts in the spectrum located at about 62 ppm and 68.4 ppm. The absence of chemical shifts in the C-NMR spectrum corresponding to carbon atoms in an epoxy ring further supports the view that... 

---