Insights into detailed hierarchical puncture-resistance for Bombyx mori silkworm cocoons

Author:

Wang Qian1,Zhang Yan1,Liang Chunling1,Liao Yinchang1,Wang Ping1ORCID,Hu Dongmei2

Affiliation:

1. National Engineering Laboratory for Modern Silk, Soochow University, China

2. Key Laboratory of Multifunctional and Smart Systems, Suzhou Institute of Nano-Tech and Nano-Bionics, China

Abstract

Silkworm cocoons illustrate excellent puncture-resistance performance after an insight into their layers while a clear understanding of the correlation between the excellent puncture property and the silk secondary structure is still lacking. Herein, we peeled silkworm cocoon into eight layers, and a combination of examination techniques including scanning electron microscopy, tensile mechanical test, Fourier transform infrared spectroscopy, Raman spectroscopy, and X-ray diffraction were applied to figure out the morphologies (surface and cross-section view), mechanical properties, secondary structure, the content of β-sheet, and crystallinity of each layer's fibroin after degumming. The results indicated that the fifth layer offers a higher level of puncture-resistance than the other layers except for the eighth layer. Additionally, a high content level of β-sheet structure and high crystallinity gives rise to the high puncture strength as for hierarchical silk fibers. In general, the new finding holds great potential inspiration for the design of puncture-resistant composites.

Funder

National Natural Science Foundation of China

Science and Technology Guiding Project of China National Textile and Apparel Council

Undergraduate Innovation and Entrepreneurship Training Program of Jiangsu Province

the Youth Innovation Promotion Association CAS

Publisher

SAGE Publications

Subject

Polymers and Plastics,Chemical Engineering (miscellaneous)

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