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Preparation and Characterization of Xylan Derivatives and Their Blends.
In: Journal of Polymers & the Environment, Jg. 26 (2018-10-01), Heft 10, S. 4114-4123
Online
academicJournal
Zugriff:
Although hemicellulose is found widely in nature, it is currently under-utilized as a raw material for commercial applications. It would be desirable to find new uses for hemicellulose in order to add value to this agro-based material. A common type of hemicellulose is xylan, which is found in a number of wood species and in cotton. In this work we prepared cationic and anionic xylan derivatives and characterized them by 13C NMR, FT-IR, size exclusion chromatography (SEC), thermal analysis, and rheology. In particular, the 13C NMR spectra of carboxymethyl xylan (CMX) and quaternary ammonium-adducted xylan (QAX) were fully assigned with the help of samples with different degrees of substitution. SEC indicated that the beechwood xylan showed a bimodal molecular weight distribution, but with derivatization the distribution tended to become unimodal. Thermal analysis and rheology studies did not uncover any surprises; the solution of xylan and its derivatives exhibited mostly Newtonian behavior. The blends of CMX and QAX produced a precipitate at almost all ratios, indicating the formation of a polyelectrolyte complex. When cationic and anionic xylan samples were added together to paper, the paper dry strength increased. Thus, the combination of cationic/anionic xylan may be of interest in selected applications. [ABSTRACT FROM AUTHOR]
Titel: |
Preparation and Characterization of Xylan Derivatives and Their Blends.
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Autor/in / Beteiligte Person: | Cheng, H. N. ; Ford, Catrina ; Kolpak, Francis J. ; Wu, Qinglin |
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Zeitschrift: | Journal of Polymers & the Environment, Jg. 26 (2018-10-01), Heft 10, S. 4114-4123 |
Veröffentlichung: | 2018 |
Medientyp: | academicJournal |
ISSN: | 1566-2543 (print) |
DOI: | 10.1007/s10924-018-1279-3 |
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