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Investigation of synthetic spider silk crystallinity and alignment via electrothermal pyroelectric literature XRD and tensile techniques

机译：通过电热热电文献XRD和拉伸技术研究合成蜘蛛丝的结晶度和排列

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摘要

The processes used to create synthetic spider silk greatly affect the properties of the produced fibers. This paper investigates the effect of process variations during artificial spinning on the thermal and mechanical properties of the produced silk. Property values are also compared to the ones of the natural dragline silk of the N. clavipes spider, and to unprocessed (as-spun) synthetic silk. Structural characterization by scanning pyroelectric microscopy is employed to provide insight into the axial orientation of the crystalline regions of the fiber and is supported by XRD data. The results show that stretching and passage through liquid baths induce crystal formation and axial alignment in synthetic fibers, but with different structural organization than natural silks. Furthermore, an increase in thermal diffusivity and elastic modulus is observed with decreasing fiber diameter, trending towards properties of natural fiber. This effect seems to be related to silk fibers being subjected to a radial gradient during production.
机译：用于制造合成蜘蛛丝的工艺极大地影响了所生产纤维的性能。本文研究了人工纺丝过程中工艺变化对生产的丝绸的热力学性能的影响。性能值也与猪笼草N. clavipes蜘蛛的天然拉丝蚕丝和未加工（初纺）合成丝进行了比较。通过扫描热电显微镜进行结构表征可提供对纤维晶体区域轴向取向的了解，并得到XRD数据的支持。结果表明，拉伸和通过液浴会诱导合成纤维中的晶体形成和轴向排列，但其结构组织与天然丝不同。此外，随着纤维直径的减小，观察到热扩散率和弹性模量的增加，趋向于天然纤维的性能。这种作用似乎与丝绸纤维在生产过程中受到径向梯度有关。

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