期刊
JOURNAL OF POLYMERS AND THE ENVIRONMENT
卷 26, 期 10, 页码 4114-4123出版社
SPRINGER
DOI: 10.1007/s10924-018-1279-3
关键词
Xylan; C-13 NMR; Anionic xylan; Cationic xylan; Polyelectrolyte complex; Dry paper strength
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 C-13 NMR, FT-IR, size exclusion chromatography (SEC), thermal analysis, and rheology. In particular, the C-13 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.
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