Citation: Huan Zhou, Zheng-zhong Shao, Xin Chen. Wet-spinning of Regenerated Silk Fiber from Aqueous Silk Fibroin Solutions：Influence of Calcium Ion Addition in Spinning Dope on the Performance of Regenerated Silk Fiber[J]. Chinese Journal of Polymer Science, ;2014, 32(1): 29-34. doi: 10.1007/s10118-014-1368-2 shu

Wet-spinning of Regenerated Silk Fiber from Aqueous Silk Fibroin Solutions：Influence of Calcium Ion Addition in Spinning Dope on the Performance of Regenerated Silk Fiber

1.
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China

Received Date: 29 January 2013
Revised Date: 11 April 2013

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 10979022, 20974025 and 21034003) and the National High Technology Research and Development Program of China (863 Program) (No. 2012AA030309).

Ca(Ⅱ) ions are added in the spinning dope to adjust the solidification rate of regenerated silk fibroin (RSF) solution during the wet-spinning process since Ca(Ⅱ) ions are proved to be favorable to maintain the stable silk fibroin network in our previous work. The results show that when Ca(Ⅱ)/RSF ratios are 1/50 and 1/20, the resulted RSF fibers exhibit good performance with the breaking energy more than 70 kJ/kg. However, higher Ca(Ⅱ)/RSF ratio (for example, 1/10) hinders the solidification of spinning dope and results in poor RSF fibers. These observations together with earlier papers from this laboratory confirm that to produce tough silk fibers the spinning conditions must allow sufficient time for the adjustment of silk fibroin molecular chains.
- Silk fiber,
- Natural polymer,
- Wet-spinning,
- Protein,
- Calcium
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