@article{oai:kpu.repo.nii.ac.jp:00004654,
 author = {佐道, 健 and SADOH, TAKESI},
 journal = {京都府立大學學術報告. 農學, The scientific reports of Kyoto Prefectural University. Agriculture},
 month = {Sep},
 note = {木材からリグニンを除去すると吸湿性の高まることはリグニンが木材に比較して吸湿性に乏しいことより当然期待されるのであるが, ClO_2でリグニンを除去する場合にはその過程において試料の吸湿性が急激に増加する現象が認められた。また木材とホロセルロースの角質化の難易について検討した結果, 木材を脱リグニンすると著しく角質化を起し易くなることを認めた。I, IIにおいそれぞれの実験結果を考察したが, それらを総括すると : 木材中ではこれを構成する各成分は相互にある程度結合している。そして相互に吸湿性に影響を及ぼし合つている。とくにリグニンはそれ自体吸湿性に乏しい物質であるが, 木材中ではさらにヘミセルロースと結合して, ヘミセルロースの高い吸湿性を抑制しているらしい。またヘミセルロースが吸湿性の高い物質であることは最初にのべたが, これは木材より単離した場合, または, ホロセルロース中に存在する場合であつて, 木材中では恐らくリグニンと結合しているので, その親水基はリグニンで覆われており, 自由に吸湿性を発揮することができず, リグニンを除くことによつてはじめて自由に吸湿性(親水性)を発揮しうるようになるものと推定される。, Lignin is hygrophobic material, so that it is expected that moisture sorption of delignified wood may be higher than original wood. In this report moisture regain of delignified wood which are obtained by stepwise treatments with ClO_2 or NaClO_2 solution are measured to confirm above inference, and some effects of delignaification on hygroscopicity of wood are discussed. I. On the variation of moisture regain during delignification process. Alcohol-benzene extracted wood meal (40-60 mesh) of Buna (Fagus crenata Blume) was used as starting material. The wood meal was delignified by aqueous solution of NaClO_2 with a few acetic acid at 75℃, or by 0.3% ClO_2 aqueous solution at 20℃ with various time intervals. Lignin content of treated wood given by 72% H_2SO_4 method are less than the value expected from weight loss (Fig. 2). Delignified wood was dried after replacing water with methanol and next benzene. The moisture regain of prepared samples was measured at 75.5% RH and 25℃. The results of experiment are shown in Fig. 3 for weight loss vs. moisture regain and Fig. 4 for lignin content (as Klason-lignin) vs. moisture regain. These figures show that even a few weight loss bring to steeply increase of sorption, and that the ratio of sorption of holocellulose to wood approaches to 1.2. In Fig. 5 moisture regain based on original wood was plotted against weight loss comparing with the content of components contained in sample. And moisture content owing to each component, which calculated with the values of their sorptive capacity and their content, was given in same figure. The calculated value of original wood is higher than measured value. This suggests that some components combine with others and have influence on hygroscopicity of other component in wood. And increase of moisture regain in first stage of treatment suggests that hygroscopicity of components in wood may be liberated for reason of cutting off of a certain linkage between them, in addition hygrophilic degraded-lignin is formed. II. Effect of drying processes on the hygroscopicity of delignified wood. Samples which receive different grades of lignification were used (Table 3), and following two drying processes were applied : i) oven drying for 8 hrs. at 105℃ from swollen state directly and ii) air drying after replacing water with methanol and secondary with benzene at room temperature. Untreated wood which was used as control sample was dried from swollen state through above two processes. Moisture regain of samples obtained was measured at 75.5% RH and 25℃. The results of experiment are shown in Fig. 6. In all case M_<or> is higher than M_<aq>. Q, which indicates a facility of cornification, is the least on wood and increases on delignified wood. The fact suggests that the behaviours against water of amorphous part of cellulose or hemicellulose in wood are dffferent from that in holocellulose. III. Conclusions. From these results and previous works investigated by others in related fields, especially on the role of hemicellulose for colloidal properties of pulp and paper and on the possibility of ligninhemicellulose linkage, the following conclusions may be drawn : 1) Each components have influence upon hygroscopicity of others by mean of a certain linkage, when they exist in wood. 2) Lignin is hygrophobic material and in addition may restrict the hygroscopicity of hemicellulose existing in wood. 3) Hemicellulose is high hygrophilic material, but the hygroscopicity may be restricted by lignin existing in wood.},
 pages = {114--119},
 title = {木材の物理的性質とその化学成分との関連性に関する研究 : 脱リグニン木材の吸湿性について},
 volume = {11},
 year = {1959},
 yomi = {サドウ, タケシ}
}