Ultrastructures and Mechanics of Annealed Nephila clavipes Major Ampullate Silk.,Biomacromolecules

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Ultrastructures and Mechanics of Annealed Nephila clavipes Major Ampullate Silk.
Biomacromolecules ( IF 5.5 ) Pub Date : 2020-01-31 , DOI: 10.1021/acs.biomac.9b01615
Thomas W Dugger ₁ , Sourangsu Sarkar ₂ , Sandra M Correa-Garhwal ₃ , Mikhail Zhernenkov ₄ , Yugang Zhang ₄ , Gitanjali Kolhatkar ₅ , Ramya Mohan ₁ , Luz Cruz ₁ , Aura D Lubio ₅ , Andreas Ruediger ₅ , Cheryl Y Hayashi _{1,

3,

6} , Kathryn E Uhrich _{1,

7} , David J Kisailus _{1,

2}

Affiliation

The semicrystalline protein structure and impressive mechanical properties of major ampullate (MA) spider silk make it a promising natural alternative to polyacrylonitrile (PAN) fibers for carbon fiber manufacture. However, when annealed using a similar procedure to carbon fiber production, the tensile strength and Young's modulus of MA silk decrease. Despite this, MA silk fibers annealed at 600 °C remain stronger and tougher than similarly annealed PAN but have a lower Young's modulus. Although MA silk and PAN graphitize to similar extents, annealing disrupts the hydrogen bonding that controls crystal alignment within MA silk. Consequently, unaligned graphite crystals form in annealed MA silk, causing it to weaken, while graphite crystals in PAN maintain alignment along the fiber axis, strengthening the fibers. These shortcomings of spider silk when annealed provide insights into the selection and design of future alternative carbon fiber precursors.

中文翻译：

退火Nephila锁骨主要有壶铃丝的超微结构和力学。

主要壶腹（MA）蜘蛛丝的半结晶蛋白质结构和令人印象深刻的机械性能使其成为用于碳纤维制造的聚丙烯腈（PAN）纤维的天然替代物。但是，当使用类似于碳纤维生产的程序进行退火时，MA丝的拉伸强度和杨氏模量降低。尽管如此，在600°C退火的MA丝纤维比同样退火的PAN保持更强韧，但杨氏模量更低。尽管MA丝和PAN的石墨化程度相似，但退火会破坏控制MA丝内晶体排列的氢键。因此，未取向的石墨晶体会在退火的MA丝中形成，使其变弱，而PAN中的石墨晶体会沿着纤维轴保持排列，从而增强纤维。

更新日期：2020-02-14

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