Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (04): 9-14.doi: 10.13475/j.fzxb.20190500106

• Fiber Materials • Previous Articles     Next Articles

Effect of urea degumming on mechanical properties of silk fibroin aerogels

WANG Zongqian1, YANG Haiwei1, ZHOU Jian2, LI Changlong1()   

  1. 1. School of Textile and Garment, Anhui Polytechnic University, Wuhu, Anhui 241000, China
    2. School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou, Guangdong 510275, China
  • Received:2019-05-05 Revised:2020-01-13 Online:2020-04-15 Published:2020-04-27
  • Contact: LI Changlong E-mail:licl@ahpu.edu.cn

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Abstract:

Aiming at improving mechanical properties of silk fibroin aerogel, a urea degumming process applied on raw silk was reported, and the silk fibroin aerogel was prepared through fibroin dissolution, dilution and freeze-drying. Meanwhile, the morphology and structure of the aerogel were analyzed by scanning electron microscopy, X-ray diffraction spectroscopy, infrared spectrometer and universal material testing machine. The results of which were compared with the aerogel prepared from sodium carbonate degummed silk. The findings show that the non-alkali urea degumming process has a little damage on silk fibroin, and the prepared aerogel exhibits a complete morphology and a stable skeleton structure, with relative content of its β-sheet structure being 50.27% and its crystallinity 49.33%. The compressive strength and compressive modulus of the aerogel are found to be (32.36±2.35) and (119.31± 8.93) kPa at 70% the compression deformation respectively, which are much higher than those of fibroin aerogels prepared through sodium carbonate degumming process.

Key words: silk fibroin, aerogel, urea degumming, mechanical property, crystalline structure

CLC Number: 

  • S881.3

Fig.1

Compressive stress-strain curve of two different SF aerogels"

Fig.2

SEM images of SF-U (a) and SF-S (b) aerogel (×100)"

Fig.3

FT-IR spectra of SF-U and SF-S aerogels"

Fig.4

Gaussian peak fitting of SF-U (a) and SF-S (b) aerogel"

Tab.1

Fitting results of secondary structures in SF aerogel"

样品名称 拟合系数
(R2)		 二级结构
的类型		 波数/
cm-1		 相对含
量/%
SF-U
气凝胶		 0.999 7 无规则卷曲 1 681 37.43
1 670
1 649
α-螺旋 1 661 12.30
1 640 50.27
β-折叠 1 630
1 618
SF-S
气凝胶		 0.999 5 无规则卷曲 1 681 49.37
1 670
1 649
1 644
α-螺旋 1 660 6.88
β-折叠 1 635 43.75
1 620

Fig.5

XRD spectra of SF-U and SF-S aerogels"

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