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木材の収縮膨脹に関する異方性の原因について(第 15 報) : 誘電性と異方的収縮 (2)
https://kpu.repo.nii.ac.jp/records/5747
https://kpu.repo.nii.ac.jp/records/5747056c1c4a-d6da-47ff-9e77-86ad2391cd3a
| 名前 / ファイル | ライセンス | アクション |
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KJ00000101076.pdf (864.7 kB)
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| Item type | [ELS]紀要論文 / Departmental Bulletin Paper(1) | |||||||||||||
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| 公開日 | 2017-02-20 | |||||||||||||
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| タイトル | 木材の収縮膨脹に関する異方性の原因について(第 15 報) : 誘電性と異方的収縮 (2) | |||||||||||||
| 言語 | ja | |||||||||||||
| その他（別言語等） | ||||||||||||||
| その他のタイトル | On the cause of the anisotropic shrinkage and swelling of wood. XV : On the relationships between the dielectric properties and the anisotropic shrinkage. (2) | |||||||||||||
| 言語 | en | |||||||||||||
| 言語 | ||||||||||||||
| 言語 | jpn | |||||||||||||
| 資源タイプ | ||||||||||||||
| 資源タイプ | departmental bulletin paper | |||||||||||||
| 著者 |
中戸, 莞二
× 中戸, 莞二
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| 抄録(日) | ||||||||||||||
| 内容記述タイプ | Other | |||||||||||||
| 内容記述 | (1) スギ-A, -B, モミ, カラマツの4供試材について, 春材および分離しない春秋材のマツチ軸木状の試験体(カラマツはほかに秋材試験体, Fig. 1参照)多数宛をもつ同一試料に関して, 電極板(Fig. 5)間において試料の占める容積割合に対する誘電率および誘電損失の関係(Fig. 2,3)にもとづいて, 春材, 春秋材の切線および半径誘電率(誘電損失)を測定し(測定装置についてFig. 4,6参照), これらの結果を用い秋材のそれらを(1)式によつて決定した。(2) 前報で予期したように, 春材と秋材はともに夫々の横断面において異方的誘電性を示し, 春材はその半径誘電率(誘電損失)が切線誘電率(誘電損失)よりも大きく(異方度 : 1.3∿1.5), 秋材はその逆(異方度 : 0.7∿0.9_5)である(Table 2)。しかも誘電率と誘電損失はTable 4に示すように横断面における異方度において略等しい。なお, 前報における春材, 秋材の誘電性に関する考察の根拠の妥当性が立証された。(3) 既報の春材, 秋材仮導管の大きさ, 膜厚さ, 切線および半径膜の横断面における収縮等の実験値を用い, (2)式に従つて求めた春材, 秋材の細胞膜の収縮積分値はTable 3の通りである。(4) 春材, 秋材の横断面における誘電性に関する値と収縮積分値とは, Fig. 8∿10に示すように対応する絶対値と異方度について, かなり高度な関連性を示す。これは春材, 秋材の異方的収縮に関して, 細胞膜にある活性水酸基の分布, 材の径切両方向における細胞膜の厚さの積分値の相異等が重要な要因であることを示すものと思われる。また, 誘電性に関する値に対する収縮の関係(Fig. 11∿13)とFig. 8∿10に示した関係との夫々の相異によつて, 異方的収縮の要因に細胞膜の厚さの積分値以外の顕微鏡的構造における二, 三のものが附加されると考える。 | |||||||||||||
| 言語 | ja | |||||||||||||
| 抄録(英) | ||||||||||||||
| 内容記述タイプ | Other | |||||||||||||
| 内容記述 | 1. As for the isolated springwood and gross wood (springwood-summerwood) of Sugi (Cryptomeria japonica D. DON) -A, -B, and Momi (Abies filma SIEB. et ZUCC.), and the isolated springwood, summerwood and gross wood of Karamatsu (Laix Kaempferi SARG.), the dielectric constant and dielectric loss across the grain in tangential and radial direction (the direction of electric current are respectively radial and tangential, radial : ε_r and tan δ_r, tangential : ε_t and tan δ_t) are determined according to the relations between the dielectric values and the volumetric proportion of sample in the space between capacitor plats in the oven dried condition as shown in Fig. 2 and 3. The specimens number of a sample are from 100 to 300 and the size of a specimen are 2.5×2.5×30 (longitudinal direction) mm as for springwood and gross wood, 2.5×0.3∿1.0 (radial)×30mm as for summerwood as shown in Fig. 1. And the dielectric values in tangential and radial direction are measured for the same sample. The dielectric values of summerwood of Sugi -A, -B and Momi are calculated by substitutions in Eq. (1) useing that of springwood and gross wood. 2. As shown in Table 2,ε_r (tan δ_r) are larger than ε_t (tan δ_t) as for springwoods, on the other hand ε_t (tan δ_t) are larger than ε_r (tan δ_r) as for the summerwoods. And the anisotropy-degree of dielectric constant (ε_r-1)/(ε_t-1) are nearly equal to the one of dielectric loss tan δ_r/tan δ_t as for the foregoing coniferous woods as shown in Table 4. Furthermore, the good agreement obtained between the calculated values by substitution in Eq. (1) and the observed values about Karamatsu as shown in Fig. 2 and Table 2 seems to rationalise the adoptions of the bases on theoretical considerations as shown in Fig. 5 of previous report. 3. The integral shrinkage of cell-wall (Σβ") about the isolated spring- and summerwood of foregoing coniferous woods are shown in Table 3. The values in radial (Σβ_r") and tangential direction (Σβ_t") are calculated by substitutions in Eq. (2) useing the shrinkage in thickness and width of tangential wall (β_<r1>", β_<t1>" in the Table 3) and radial wall (β_<t2>", β_<r2>"), the volumetric proportion of tangential and radial wall in tracheid (F_1', F_2). 4. About the isolated spring- and summerwood of foregoing coniferous woods, the following relations are plotted in the Fig. 8∿10 : (a) relations of Σβ_r" vs. ε_t and Σβ_t" vs. ε_r (Fig. 8) (b) relations of Σβ_r" vs. tan δ_t and Σβ_t" vs. tan δ_r (Fig. 9) (c) relations of Σβ_t"/Σβ_r" vs. (ε_r-1)/(ε_t-1) and tan δ_r/tan δ_t (Fig. 10) These linear relations seem to indicate that the principal cause of anisotropic shrinkage in transeverse section of the spring- and summerwood of coniferous woods are based on the cell-wall structure, above all the distribution and spinaxis direction of active hydroxyl groups. And it should seem that the fibril angle in tangential and radial wall, the volumetric proportion of tangential and radial wall in tracheid transverse section has been closely connected with the distribution of active hydroxyl groups. On the otherhand, the relations of the shrinkage (radial : β_r, tangential : β_t, degree of anisotropic shrinkage : β_t/β_r) to the dielectric values are plotted in Fig. 11∿13. The respective difference between integral shrinkage vs. dielectric values (Fig, 8∿10) and shrinkage vs. dielectric values (Fig. 11∿13) seems to indicate that the other cause of anisotropic shrinkage in tanseverse section is present in the microscopic structure of spring- and summerwood. | |||||||||||||
| 言語 | en | |||||||||||||
| 書誌情報 |
ja : 西京大学学術報告. 農学 en : The scientific reports of the Saikyo University. Agriculture 巻 10, p. 45-54, 発行日 1958-08-01 |
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| 収録物識別子タイプ | NCID | |||||||||||||
| 収録物識別子 | AN00094635 | |||||||||||||
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| 収録物識別子タイプ | PISSN | |||||||||||||
| 収録物識別子 | 03709329 | |||||||||||||
