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Cellulose

Erschienen in:

01.10.2008

Upgrading of paper grade pulps to dissolving pulps by nitren extraction: yields, molecular and supramolecular structures of nitren extracted pulps

verfasst von: Ron Janzon, Jürgen Puls, Andreas Bohn, Antje Potthast, Bodo Saake

Erschienen in: Cellulose | Ausgabe 5/2008

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Abstract

Different paper grade pulps were extracted with nitren in order to produce dissolving pulps and polymeric xylan. The yield and molecular structure of the extracted pulps were investigated by carbohydrate analysis and HPSEC combined with fluorescence labelling in order to additionally monitor the carbonyl and carboxyl group profiles of the pulps. The supramolecular structure of selected pulps were further studied by solid state ¹³C-CP/MAS-NMR and wide-angle X-ray scattering (WAXS). These supramolecular data of nitren extracted pulps were compared to samples extracted with NaOH and a conventional dissolving pulp in order to classify the properties of nitren extracted pulps. Nitren extraction results in selective xylan removal without noticeable degradation or oxidation of the cellulose fraction. The resulting dissolving pulps have high molar masses, a narrow molar mass distribution and the typical contents of carbonyl and carboxyl groups. The supramolecular structure of cellulose is less affected by nitren compared to strong NaOH, and the resultant dissolving pulps still have the cellulose I structure.

Vorheriger Artikel Self-extinguishing cotton fabric with minimal phosphorus deposition

Nächster Artikel Inhibition of aluminium and mild steel corrosion in acidic medium using Gum Arabic

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Titel: Upgrading of paper grade pulps to dissolving pulps by nitren extraction: yields, molecular and supramolecular structures of nitren extracted pulps
verfasst von: Ron Janzon
Jürgen Puls
Andreas Bohn
Antje Potthast
Bodo Saake
Publikationsdatum: 01.10.2008
Verlag: Springer Netherlands
Erschienen in: Cellulose / Ausgabe 5/2008
Print ISSN: 0969-0239
Elektronische ISSN: 1572-882X
DOI: https://doi.org/10.1007/s10570-008-9224-6

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