writer：Ying Xu, Yaopeng Zhang, Huili Shao, Xuechao Hu
keywords：silk fibroin,dissolution,N-methyl morpholine N-oxide (NMMO), rheological behavior,fiber spinning
source：期刊
specific source：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Issue time：2005年

As an important direct solvent for cellulose, N-methyl morpholine N-oxide (NMMO) is environmentally friendly, and potentially very economical. Silk fibroin (SF) (Bombyx mori) can also be dissolved directly in (NMMOH2O)-H-.. However, it is unexpectedly difficult to obtain a silk fibroin solution with a concentration higher than 10wt.% in this way, and extensive degradation of silk fibroin occurs if the dissolution I temperature is higher than 110 degrees C. On the other hand, it is found that regenerated silk fibroin (RSF) film is much easier to dissolve in (NMMOH2O)-H-. than ordinary SF. The RSF in (NMMOH2O)-H-. can be easily concentrated to a range from 10 to 25 wt.%. The structural differences between the degummed silk fiber and the RSF film lead to this different solubility in (NMMOH2O)-H-.. The rheological behavior of concentrated RSF/(NMMOH2O)-H-. solutions were also investigated. Regenerated silk fiber was spun from this type of solution, and its strength call reach up to 3.07 cN/dtex. (c) 2005 Elsevier B.V. All rights reserved.