Characterization of polyalkylvinyl ether phases by solid-state and suspended-state nuclear magnetic resonance investigations

using different ratios and compositions of n-butylvinyl ether (C2VE) and n-octadecylvinyl ether (C18VE) with triethylene glycol divinyl ether or divinylbenzene as crosslinkers, respectively. These phases were investigated by means of solid-state C-13 cross-polarization magic angle spinning nuclear magnetic resonance (NMR) spectroscopy and H-1 high-resolution magic angle spinning (HR MAS) NMR spectroscopy in suspended-state. A comparison of these two methods showed the substantial advantages of 1H HR MAS NMR measurements. Structure elucidation was achieved using a 2D H,H-COSY NMR experiment performed under MAS conditions enabling full peak assignment of the]H NMR spectra of these phases. The dynamic behavior of the polyalkylvinyl ether phases was determined by employing temperature-dependent measurements of spin-lattice relaxation times (T-1) as well as accumulation of a 2D wide line separation NMR spectrum. (C) 2000 Academic Press.