caa a22 4500 463247493 CHVBK 20180405153330.0 cr unu---uuuuu 170326e20070601xx s 000 0 eng 10.1007/s10086-006-0847-7 doi (NATIONALLICENCE)springer-10.1007/s10086-006-0847-7 Contribution of lignin to the reactivity of wood in chemical modifications I: influence of delignification on acetylation [Elektronische Daten] [Kazuya Minato, Rieka Shimizu, Shingo Kawaguchi] In order to examine the contribution of wood components to the acetylation of wood, we acetylated wood meal that had been partially delignified. The results were analyzed in terms of the reaction kinetics. The first-order rate equation was successfully adjusted to the weight gain data. The rate constant for acetylation initially increased with progress of lignin elimination and then turned to decrease; the apparent activation energy showed the reverse tendency and ranged from about 90 to 130 kJ/mol. These results suggest that lignin elimination brings not only separation of lignin but also drastic change of the chemical and/or physical structure in the residual lignin, and this affects the reactivity of wood meal as a whole. The ultimate weight gain estimated by the regression of the rate equation showed a minimum when lignin was moderately eliminated, which was explained in terms of enhanced reactivity of lignin and lower accessibility for holocellulose than predicted. The equilibrium moisture content had a maximum when lignin was moderately eliminated. This tendency is the opposite of that observed for the ultimate weight gain, and suggests that the sites for acetylation do not always correspond to those for moisture adsorption. The Japan Wood Research Society, 2007 Chemical modification nationallicence Acetylation nationallicence Lignin content nationallicence Reactivity nationallicence Reaction parameter nationallicence Minato Kazuya Graduate School of Agriculture, Kyoto Prefectural University, Shimogamo Hangi-cho, Sakyo-ku, 606-8522, Kyoto, Japan aut Shimizu Rieka Faculty of Agriculture, Kyoto Prefectural University, 606-8522, Kyoto, Japan aut Kawaguchi Shingo Graduate School of Agriculture, Kyoto Prefectural University, Shimogamo Hangi-cho, Sakyo-ku, 606-8522, Kyoto, Japan aut Journal of Wood Science Springer-Verlag 53/3(2007-06-01), 218-222 1435-0211 53:3<218 2007 53 10086 https://doi.org/10.1007/s10086-006-0847-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10086-006-0847-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Minato Kazuya Graduate School of Agriculture, Kyoto Prefectural University, Shimogamo Hangi-cho, Sakyo-ku, 606-8522, Kyoto, Japan aut NATIONALLICENCE 700 1- Shimizu Rieka Faculty of Agriculture, Kyoto Prefectural University, 606-8522, Kyoto, Japan aut NATIONALLICENCE 700 1- Kawaguchi Shingo Graduate School of Agriculture, Kyoto Prefectural University, Shimogamo Hangi-cho, Sakyo-ku, 606-8522, Kyoto, Japan aut NATIONALLICENCE 773 0- Journal of Wood Science Springer-Verlag 53/3(2007-06-01), 218-222 1435-0211 53:3<218 2007 53 10086 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 463247493 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer