Role of urea in alkaline dissolution of cellulose

被引：86

作者：

Isobe, Noriyuki ^{[1
]}

Noguchi, Keiichi ^{[3
]}

Nishiyama, Yoshiharu ^{[4
]}

Kimura, Satoshi ^{[1
,2
]}

Wada, Masahisa ^{[1
,2
]}

Kuga, Shigenori ^{[1
]}

机构：

[1] Univ Tokyo, Dept Biomat Sci, Grad Sch Agr & Life Sci, Bunkyo Ku, Tokyo 1138657, Japan

[2] Kyung Hee Univ, Dept Plant & Environm New Resources, Coll Life Sci, Yongin 446701, Gyeonggi Do, South Korea

[3] Tokyo Univ Agr & Technol, Inst Symbiot Sci & Technol, Koganei, Tokyo 1848588, Japan

[4] Univ Grenoble 1, Ctr Rech Macromol Vegetales, F-38401 Grenoble 9, France

来源：

CELLULOSE | 2013年 / 20卷 / 01期

关键词：

Alkali/urea solvent; Dissolution; DSC; X-ray diffractometry; Solubility; AQUEOUS NAOH SOLUTIONS; SODIUM-HYDROXIDE; C-13; NMR; MOLECULAR-STRUCTURE; INCLUSION COMPLEX; LIGHT-SCATTERING; LOW-TEMPERATURE; X-RAY; SOLUBILITY; SYSTEM;

D O I：

10.1007/s10570-012-9800-7

中图分类号：

TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];

学科分类号：

0805 ; 080502 ; 0822 ;

摘要：

To elucidate the role of urea in dissolution of cellulose in aqueous alkali-urea solvent, the dissolution process was monitored by differential scanning calorimetry and X-ray diffractometry. Urea had no direct interaction with cellulose in dissolution process, but promoted the decrease of crystallinity. Moreover, the addition of urea increased the dissolved fraction of cellulose in the solvent by 1.5-2.5 times and improved the thermal stability of the solution. Urea might help alkali hydrate to penetrate into crystalline region of cellulose by stabilizing the alkali-swollen cellulose molecules, leading to an increase in dissolved fraction of cellulose. This stabilization may be due to the local accumulation of urea on the hydrophobic surface, preventing the hydrophobic association of dissolved cellulose molecules.

引用

页码：97 / 103

页数：7

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