C-13 solid-state NMR analysis has been performed on microporous superabsorbing networks based on hydroxyethylcellulose and sodium salt of carboxymethylcellulose in order to determine the chemically effective cross-linking degree. Microporous samples characterized by two different degrees of cross-link have been analyzed by performing C-13 cross-polarization magic angle spinning (CP-MAS) solid-state spectra and single-pulse excitation (SPE) experiments. Cross-linking degrees, expressed as number of cross-links per monomer, have been evaluated from the area of resonance due to methylene carbon atoms present on reacted cross-linker molecule (divinyl sulfone) and area of resonances due to anomeric carbon atoms C-l of the polysaccharide rings. Optimization procedures for both CP-MAS and SPE experiments are also reported.

13C Solid State NMR determination of crosslinking degree in super-absorbing cellulose based networks

D Capitani;
2000

Abstract

C-13 solid-state NMR analysis has been performed on microporous superabsorbing networks based on hydroxyethylcellulose and sodium salt of carboxymethylcellulose in order to determine the chemically effective cross-linking degree. Microporous samples characterized by two different degrees of cross-link have been analyzed by performing C-13 cross-polarization magic angle spinning (CP-MAS) solid-state spectra and single-pulse excitation (SPE) experiments. Cross-linking degrees, expressed as number of cross-links per monomer, have been evaluated from the area of resonance due to methylene carbon atoms present on reacted cross-linker molecule (divinyl sulfone) and area of resonances due to anomeric carbon atoms C-l of the polysaccharide rings. Optimization procedures for both CP-MAS and SPE experiments are also reported.
2000
Istituto per i Sistemi Biologici - ISB (ex IMC)
HYDROGELS
POLYMERS
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/127257
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