Role of humidity on the structures and properties of regenerated silk fibers

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• 作者：Qingfa Peng ; Huili Shao ; Xuechao Hu ; Yaopeng Zhang ; ^{zyp@dhu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Dry spinning ; Relative humidity ; Biomimetic ; Regenerated silk fibroin ; Wide angle X-ray diffraction
• 刊名：Progress in Natural Science
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：25
• 期：5
• 页码：430-436
• 全文大小：5380 K

文摘

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 β-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.