丝素在NMMO·H_2O中的溶解及溶液流变性能的研究

Dissolution and rheological behaviors of silk fibroin (Bombyx mori) in N-methyl morpholine N-oxide

探讨了丝素在N-甲基吗啉-N-氧化物一水合物(NMMO.H2O)中的溶解行为,结果发现:天然蚕丝纤维脱胶后得到的丝纤维可以直接溶解在NMMO.H2O中,但是很难得到高于10%浓度的溶液,因而无法用于纺丝.而由再生丝素水溶液制得的再生丝素膜则易于溶解在NMMO.H2O中,并可以得到浓度高达25%的再生丝素/NMMO.H2O溶液,在上述研究的基础上,本文还对再生丝素/NMMO.H2O的流变行为进行了初步研究.

As an important direct solvent for cellulose, N-methyl morpholine N-oxide (NMMO) is environmental friendly, which can be completely recovered and recycled, and potentially very economical. Silk fibroin (Bombyx mori) can also be dissolved directly in NMMO·H_2O. However, it is unexpectedly difficult to obtain silk solution with concentration higher than 10%(wt), and extensive degradation of silk fibroin is found to be occurred at the temperature of dissolving higher than 100℃. On the other hand we found the regenerated silk fibroin film is much more easier to be dissolved in NMMO·H_2O. The concentration of silk fibroin in NMMO·H_2O can be easily concentrated to the range of 10%(wt) to 25%(wt). The structure difference between the degummed silk fibre and the regenerated silk fibroin film leads to the resultant different dissolving fact in NMMO·H_2O. The rheological behaviors of concentrated silk fibroin/ NMMO·H_2O solution was also investigated.