The variability of mechanical properties and molecular conformation among different spider dragline fibers

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• 作者：Lei Zhang (1) (2)
  Leng Han (1)
  Yujun Wang (3)
  Tianfu Zhao (3)
  Xianxun Bao (2)
  Masao Nakagaki (1)
  
• 关键词：Spider dragline fiber ; Mechanical properties ; Molecular conformation ; Variability
• 刊名：Fibers and Polymers
• 出版年：2013
• 出版时间：July 2013
• 年：2013
• 卷：14
• 期：7
• 页码：1190-1195
• 全文大小：400KB
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• 作者单位：Lei Zhang (1) (2)
  Leng Han (1)
  Yujun Wang (3)
  Tianfu Zhao (3)
  Xianxun Bao (2)
  Masao Nakagaki (1)
  
  1. Division of Applied Biology, Faculty of Textile Science and Technology, Shinshu University, Nagano, 386-8567, Japan
  2. Sericultural Reseach Institute, Anhui Academy of Agricultural Sciences, Anhui, 230061, China
  3. R&D Division, Okamoto Corporation, Nara, 635-8550, Japan
  

文摘

Spider dragline fiber is a high-performance biomaterial that has received much attention. To screen the outstanding spider dragline fibers, the mechanical properties and microstructures of dragline fibers collected from Nephia clavata, Nephia pilipes, Argiope bruennichi and Argiope amoena were investigated. It was found that the mechanical properties of spider dragline fiber were variable. Among the four different species, the larger spiders did not always extrude thicker dragline fibers and produce fibers with the maximum breaking force. The dragline fibers could sustain one to three times the body weight of the spider at a reeling speed of 20 mm/s. N. clavata dragline fiber showed a stronger breaking stress and initial modulus than that of N. pilipes, A. bruennichi and A. amoena. With an increasing reeling speed, the breaking strain decreased; the initial modulus increased in N. clavata, N. pilipes and A. bruennichi, but the breaking stress exhibited a different tendency. The results also revealed that dragline fiber of N. clavata contained the most β-sheet polypeptides and an excellent orientation of β-sheet molecular chains.