Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (10): 41-46.doi: 10.13475/j.fzxb.20201207506

• Fiber Materials • Previous Articles     Next Articles

Structure and properties of four different kinds of domestic cocoon varieties

XUE Rujing1, MO Xiaoxuan1, LIU Fujuan1,2,3()   

  1. 1. College of Textile and Clothing Engineering, Soochow University, Suzhou, Jiangsu 215021, China
    2. National Engineering Laboratory of Modern Silk, Soochow University, Suzhou, Jiangsu 215123, China
    3. Nantong Textile & Silk Industrial Technology Research Institute, Nantong, Jiangsu 226300, China
  • Received:2020-12-28 Revised:2021-06-17 Online:2021-10-15 Published:2021-10-29
  • Contact: LIU Fujuan E-mail:liufujuan@suda.edu.cn

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Abstract:

In order to develop and design new functional textiles, multilayer morphology, chemical structure, crystalline structure, mechanical properties and thermal conductivity of four varieties of different silkworm cocoons walls were characterized by scanning electron microscope, Fourier transform infrared spectroscopy, X-ray diffractometer, universal material testing machine and temperature and humidity tester, respectively. Theoretical analysis on the multilayer structure was conducted and the design principle of thermal protection products was studied and established. Research results show that all the four varieties of cocoon walls have unique multilayer porous structure, and the diameter of the fibers first increase and then decrease from the outer layer to the inner layer. Although the thickness and size are different, the four varieties of silkworm cocoon walls have good thermal buffering properties. In general, the tiger head cocoon wall has the best heat resistance, and the zebra cocoon wall (green) has the best thermal conductivity. When designing the multilayer structure of thermal protection products, the thermal insulation effect will be greatly improved by appropriately increasing the number of layers of thermal protection products under cost permission.

Key words: cocoon wall, thermal conductivity, multilayer structure, porous media

CLC Number: 

  • TS141

Fig.1

Schematic diagram of cocoon sampling"

Fig.2

Appearance of four kinds cocoons and its SEM images of inner layers(×150).(a)Tiger head cocoon; (b)White cocoon;(c)Zebra cocoon(green); (d) Zebra cocoon(yellow)"

Fig.3

Fiber average diameters from outer to inner layer of four varieties of silkworm cocoons"

Fig.4

FT-IR spectra of four varieties of silkworm cocoons outermost(a)and innermost(b)layer"

Fig.5

X-ray diffraction spectra of four varieties of silkworm cocoon outermost and innermost layers.(a)Tiger head cocoon; (b)White cocoon;(c)Zebra cocoon(green);(d) Zebra cocoon(yellow)"

Fig.6

Stress-strain curves for four varieties of silkworm cocoons along radial direction(a) and axial direction(b)"

Tab.1

Breaking stress and breaking strain of four varieties of silkworm cocoons along radial direction and axial direction"

蚕茧种类 径向 轴向
断裂应力/MPa 断裂应变/% 断裂应力/MPa 断裂应变/%
虎头蚕茧壳 15.71 ± 6.29 12.45 ± 2.16 5.02 ± 1.18 14.04 ± 1.85
白色茧壳 23.90 ± 4.64 12.03 ± 1.02 8.18 ± 2.81 9.15 ± 1.23
斑马蚕茧壳(绿色) 22.27 ± 1.77 12.60 ± 0.71 1.81 ± 0.81 8.28 ± 7.12
斑马蚕茧壳(黄色) 32.45 ± 5.19 16.18 ± 1.52 10.56 ± 2.35 14.85 ± 2.10

Fig.7

Temperature profiles for inside of four varieties of silkworm cocoons as the ambient temperature increases(a)and decreases(b)"

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