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Characterization of Polyalkylvinyl Ether Phases by Solid-State and Suspended-State Nuclear Magnetic Resonance Investigations

✍ Scribed by Stefan Bachmann; Christine Hellriegel; Jürgen Wegmann; Heidi Händel; Klaus Albert

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
157 KB
Volume
17
Category
Article
ISSN
0926-2040

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✦ Synopsis

Pure organic polyalkylvinyl ether phases were synthesized by suspension polymerization using different ratios and compositions of n-butylvinyl ether (C 4 VE) and n-octadecylvinyl ether (C 18 VE) with triethylene glycol divinyl ether or divinylbenzene as crosslinkers, respectively. These phases were investigated by means of solid-state 13 C cross-polarization magic angle spinning nuclear magnetic resonance (NMR) spectroscopy and 1 H high-resolution magic angle spinning (HR MAS) NMR spectroscopy in suspended-state. A comparison of these two methods showed the substantial advantages of 1 H 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 1 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.

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