ON THE MANNAN ACETATE. I. A NEW METHOD OF PREPARATION OF MANNAN ACETATE AND SOME OF ITS PROPERTIES

R. Shinoda; C. Ashizawa

doi:10.2115/fiber1925.4.6

醋酸マンナンの新製造法及その性質等に關する研究

篠田鐐, 芦澤忠治

著者情報

ジャーナルフリー

1928 年 4 巻 1 号 p. 6-13

DOI https://doi.org/10.2115/fiber1925.4.6

詳細

発行日: 1928 年受付日: - J-STAGE公開日: 2008/11/27 受理日: 1927/12/13 早期公開日: - 改訂日: -
訂正情報
訂正日: 2008/11/27 訂正理由: - 訂正箇所: 論文受付日訂正内容: 訂正前 : 19271215

訂正日: 2008/11/27 訂正理由: - 訂正箇所: 論文抄録訂正内容: Wrong : The authors studied on the preparation of mannan acetate from raw “Japanese konjaku powder” (Amorphophallus Konjac) which is only produced in the oriental countries, especially in Japan, and investigated some properties of the mannan acetate, such as solubility in various solvents, viscosity of the solution in a suitable solvent, stability and the tensile strength of its film, for the purpose of obtaining a substitute of cellulose acetate.
From the results of the experiments, a new method of preparation of mannan acetate was discovered and some useful information in connection with the properties were obtained.
(1) Raw “Japanese konjaku powder” is first treated with aqueous solution of C1027 and the resulted product makes into threads in order to be easily treated afterwards; then it is subjected to coagulation with glacial acetic acid and warmed with hot air. The product thus treated is heated on a boiling water bath for about 20 hrs. with continuous stirring till the reaction is completed. According to this new method, the chemicals used for reaction, such as glacial acetic acid and acetic anhydride, can be saved considerably, and the duration of reaction becomes shorter and no decomposition of konjaku mannan takes place during reaction.
(2) The composition of the mannan acetate obtained is as follws:
From the number of acetyl group it seems that the mannan acetate is triacetate of mannan.
(3) The mannan acetate is very stable and soluble in various organic solvents, among which the mixture, tetrachlorethane 4, methyl acetate 4, and methyl alcohol 2, is the most suitable solvent; 1%, solution in such a solvent has a suitable viscosity, giving a strong film.
(4) Though there are many substances containing mannan, Japanese konjaku powder is most suitable as a raw material of mannan from economical point of view.
(5) The mannan acetate can be refined satisfactorily by washing it with water.

訂正日: 2008/11/27 訂正理由: - 訂正箇所: 所属機関情報訂正内容: 訂正前 :
1) 於陸軍科學研究所

訂正後 :
1) 陸軍科學研究所

訂正日: 2008/11/27 訂正理由: - 訂正箇所: PDFファイル訂正内容: -

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