Journal
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
Volume 25, Issue 5, Pages 430-436Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pnsc.2015.09.006
Keywords
Dry spinning; Relative humidity; Biomimetic; Regenerated silk fibroin; Wide angle X-ray diffraction
Funding
- National Natural Science Foundation of China [21274018]
- DHU Distinguished Young Professor Program [A201302]
- Fundamental Research Funds for the Central Universities [2232013A3-11]
- Programme of Introducing Talents of Discipline to Universities [111-2-04]
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Silk fiber was processed from highly concentrated spinning dope to solid fibers along with water removal. To understand the mechanism of water removal during silk fiber spinning process, a microfluidic chip was designed and applied to investigate the structures and mechanical properties of two kinds of regenerated silk fibroin fibers dry-spun at different relative humidity. The experimental results showed that the diameters of the fibers spun at 40% RH are always larger than the fibers spun at 50% RH due to different removal rates of water. The fibers spun at low humidity contain more beta-sheet structure and lower degree of chain orientation and crystalline orientation. These results indicate that the fast phase transition of silk fibroin from sol gel to silk fiber undergoes with rapid water removal and higher fiber orientation relates to more residue water and drawing force. (C) 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of Chinese Materials Research Society.
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