Regenerated protein fibers. II. Viscoelastic behavior of silk fibroin solutions

✍ Scribed by Kiyoichi Matsumoto; Hiroyuki Uejima; Yoshiyuki Sano; Hiroshi Sumino

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 138 KB
• Volume: 35
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19970730)35:10<1955::aid-pola10>3.0.co;2-g

✦ Synopsis

The dynamic viscoelastic behavior of a concentrated solution of silk fibroin dissolved in the ''MU'' solvent is measured. The dynamic viscosity h and dynamic elasticity G increase with increasing concentration of silk fibroin at constant frequency; however, the increasing frequency decreases h and G at a constant concentration of silk fibroin. When the mixing ratio of C 2 H 5 OH/H 2 O in the ''MU'' solvent is increased at a constant concentration of LiBr rH 2 O, h and G sharply increase at constant frequency. If the LiBrrH 2 O concentration is varied in the ''MU'' solvents whose ratio of C 2 H 5 OH/H 2 O is kept constant at 100 : 0, both h and G are greater for LiBr rH 2 O concentrations of 50% by weight compared to concentrations of 40% by weight. The dependence of h on the temperature of the solution can be predicted by Andrade's viscosity equation. Spinnability improves when the SF concentration is increased.