Origin of the variability of the mechanical properties of silk fibers: 4. Order/crystallinity along silkworm and spider fibers - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Journal of Raman Spectroscopy Year : 2014

Origin of the variability of the mechanical properties of silk fibers: 4. Order/crystallinity along silkworm and spider fibers

Abstract

The poor crystallinity of proteic fibers has fuelled an ongoing debate over their exact organization. We present a full-range Raman comparison of Nephila madagascariensis spider and Bombyx mori silkworm silks that sheds some new light on that matter. On the one hand, a large variability is observed along the fibers in the -200 to 200cm(-1) spectral window, which is sensitive to the long-range order signature of polyamide chains. This questions the validity of previous literature data considering silk fiber as a homogeneous material. On the other hand, the amide I' band is almost independent of the targeted point, which sets a limit to this widely used structure probe. In-line mapping of the fibers showed that the extension of the ordered zones ranges between 1 and 3 mu m. The correlation between the macromechanical behavior (the stress-strain curves) and the nanomechanics (Raman low wavenumber signatures) under controlled tensile strain demonstrates a Prevorsek's type microstructure: the macromolecular chains belong to both ordered and amorphous regions.

Dates and versions

hal-02639507 , version 1 (28-05-2020)

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Marine Wojcieszak, Aline Percot, Sylvie Noinville, Gwenaël Gouadec, Bernard Mauchamp, et al.. Origin of the variability of the mechanical properties of silk fibers: 4. Order/crystallinity along silkworm and spider fibers. Journal of Raman Spectroscopy, 2014, 45 (10), pp.895-902. ⟨10.1002/jrs.4579⟩. ⟨hal-02639507⟩
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