天然セルロース繊維の微細構造について
第1報 アルカリ浸漬による木材パルプの微細構造の変化
1958 年 14 巻 10 号 p. 684-688
詳細
1958 年 14 巻 10 号 p. 684-688
In order to investigate changes in fine structure of cellulose fibers in caustic treatment, a series of samples were prepared from a commercial dissolving sulfite pulp by steeping in 4_??_18% sodium hydroxide solutions at 20°C, washing and drying. These samples were subjected to acid hydrolysis, and their crystallinity, leveling off degree of polymerization and moisture regain of the hydrocellulose were determined, as values relating to weight, length and width of micells (highly ordered regions) respectively.
The length and width of micells decreased with increase in concentration of steeping solution from 0% to 10_??_12% (Fig. 3. 5). This fact shows that transitional area exists in these both directions of micells. The crystallinity also decreased in that concentration range, but it increased again at higher concentrations, while the size of micells remained constant (Fig. 2). Therefore it seems that the re-increase of crystallinity is not due to the increase of size of micells, but the increase in number of micells, though there remain problems in the methods used here to estimate size of micells.
