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Cellulose

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01.02.2014 | Original Paper

NMR spectroscopic studies on dissolution of softwood pulp with enhanced reactivity

verfasst von: Tommi Virtanen, Sirkka Liisa Maunu

Erschienen in: Cellulose | Ausgabe 1/2014

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Abstract

N-methylmorpholine N-oxide (NMMO) is a known cellulose solvent used in industrial scale (LyoCel process). We have studied interactions between pretreated softwood pulp fibers and aqueous NMMO using nuclear magnetic resonance (NMR) spectroscopic methods, including solid state cross polarisation magic angle spinning (CP-MAS) ¹³C and ¹⁵N spectroscopies, and ¹H high resolution MAS NMR spectroscopy. Changes in both cellulose morphology and in accessibility of solvents were observed after the pulp samples that were exposed to solvent species were treated at elevated temperature. Evidence about interactions between cellulose and solvent components was observed already after a heat treatment of 15 min. The crystalline structure of cellulose was seen to remain intact for the first 30 min of heat treatment, at the same time there was a re-distribution of solvent species taking place. After a 90 min heat treatment the crystalline structure of cellulose had experienced major changes, and potential signs of regeneration into cellulose II were observed.

Vorheriger Artikel A morphological interpretation of water chemical exchange and mobility in cellulose materials derived from proton NMR T2 relaxation

Nächster Artikel SEC-MALLS analysis of TEMPO-oxidized celluloses using methylation of carboxyl groups

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Titel: NMR spectroscopic studies on dissolution of softwood pulp with enhanced reactivity
verfasst von: Tommi Virtanen
Sirkka Liisa Maunu
Publikationsdatum: 01.02.2014
Verlag: Springer Netherlands
Erschienen in: Cellulose / Ausgabe 1/2014
Print ISSN: 0969-0239
Elektronische ISSN: 1572-882X
DOI: https://doi.org/10.1007/s10570-013-0144-8

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