Investigation of Coagulant Type Effect on Wet-Spinning Process of Regenerated Silk Fibroin

S Siadat, J Mokhtari
2017 Amirkabir Journal of Mechanical Engineering Amirkabir Journal of Mechanical Engineering   unpublished
Re-generated silk fibroin (RSF) with various concentrations including 8, 10, 12.5 and 13% (w/w), was dissolved in N-methyl morpholine N-oxide (NMMO) to prepare spinning solutions. The effect of several coagulants such as methanol, ethanol and 1-propanol, and temperatures of spinning including 95, 110 and 120 °C, on the wet spinnability of the silk fibroin solutions were investigated. Tenacity at break of undrawn fibers, which were produced by various concentrations and coagulants, were
more » ... Bead free fibers with high tenacity and elongation at break (1.6 cN/dtex and 34.25% respectively) were produced at concentration of 8% (w/w), temperature of 95 °C and by presenting of methanol coagulant. Also by increasing of concentrations from 8% to 10, 12.5 and 13%, the tenacity was decreased to 0.81, 0.70 and 0.20 cN/dtex, respectively. Tenacity of fibers were obtained in 1-propanol (0.6 cN/dtex) was lower than those in ethanol and methanol coagulation bath, 0.8 and 1.6 cN/dtex, respectively. These results were shown that chemical structure type of coagulant strongly influenced the wet spinnability of undrawn regenerated silk fibers.
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