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Characteristics of pre-extracted hemicelluloses from Korean mixed wood by hot water and alkali solution and its effect on handsheet properties  

Seo, Dong-Il (Dept. of Forest Sciences, Seoul National University)
Lee, Sang-Hoon (Dept. of Forest Sciences, Seoul National University)
Sim, Kyu-Jeong (Dept. of Forest Sciences, Seoul National University)
Lee, Hak-Lae (Dept. of Forest Sciences, Seoul National University)
Youn, Hye-Jung (Dept. of Forest Sciences, Seoul National University)
Publication Information
Journal of Korea Technical Association of The Pulp and Paper Industry / v.43, no.5, 2011 , pp. 60-67 More about this Journal
Abstract
Hemicelluloses pre-extracted from Korean mixed wood chip were investigated as a wet-end additive. Hemicelluloses dissolved in hot water and alkali solution were isolated by ethyl alcohol precipitation from pre-extractives. They showed molecular weight of 9,000 ~ 27,000 g/mol as revealed by size exclusion chromatography. The reduction of molecular weight through hot water extraction was caused by autohydrolysis. Chemical composition of the hemicelluloses were analyzed with high-performance liquid chromatography and UV-Vis spectroscopy. As the surface charge of isolated hemicelluloses were negative, the adsorption of hemicelluloses onto softwood unbleached kraft pulp fiber was promoted by poly-DADMAC. The physical properties of handsheets increased as the molecular weight of hemicellulose increased. On the other hands, the optical property decreased with hemicellulose adsorption.
Keywords
hemicellulose; pre-extraction; isolation; SEC; molecular weight; strength additive;
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Times Cited By KSCI : 4  (Citation Analysis)
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