Liquid crystalline solutions of cellulose in phosphoric acid

被引：106
作者：
Boerstoel, H [1 ]
Maatman, H [1 ]
Westerink, JB [1 ]
Koenders, BM [1 ]
机构：
[1] Acordis Res, NL-6800 TC Arnhem, Netherlands
来源：
POLYMER | 2001年 / 42卷 / 17期
关键词：
cellulose; liquid crystalline solutions; yarns;
D O I：
10.1016/S0032-3861(01)00210-5
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
It was found that anhydrous phosphoric acid is an excellent direct solvent for cellulose. Dissolution is very fast, and liquid crystalline solutions are formed above a cellulose concentration of 7.5% (w/w) at room temperature; even solutions containing 38% (w/w) cellulose can be prepared. The composition of the solvent is expressed in a P2O5 concentration. Anhydrous conditions are obtained above a P2O5 concentration of 74% (w/w) (superphosphoric acid). The solutions were characterised by determining the clearing temperature, which was found to increase with decreasing water content in the phosphoric acid solvent and to level off under anhydrous conditions. Cellulose yarns with high moduli and high tenacities were wet spun from the anisotropic solutions, Superphosphoric acid is also capable of dissolving inter aliacellulose acetate, ethyl cellulose and chitin, with formation of anisotropic solutions. (C) 2001 Elsevier Science Ltd. All rights reserved.
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收藏
页码：7371 / 7379
页数：9
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