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Issue 27, 2016
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Glass transitions in native silk fibres studied by dynamic mechanical thermal analysis

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Abstract

Silks are a family of semi-crystalline structural materials, spun naturally by insects, spiders and even crustaceans. Compared to the characteristic β-sheet crystalline structure in silks, the non-crystalline structure and its composition deserves more attention as it is equally critical to the filaments' high toughness and strength. Here we further unravel the structure–property relationship in silks using Dynamic Mechanical Thermal Analysis (DMTA). This technique allows us to examine the most important structural relaxation event of the disordered structure the disordered structure, the glass transition (GT), in native silk fibres of the lepidopteran Bombyx mori and Antheraea pernyi and the spider Nephila edulis. The measured glass transition temperature Tg, loss tangent tan δ and dynamic storage modulus are quantitatively modelled based on Group Interaction Modelling (GIM). The “variability” issue in native silks can be conveniently explained by the different degrees of structural disorder as revealed by DMTA. The new insights will facilitate a more comprehensive understanding of the structure–property relations for a wide range of biopolymers.

Graphical abstract: Glass transitions in native silk fibres studied by dynamic mechanical thermal analysis

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Publication details

The article was received on 05 Jan 2016, accepted on 09 Jun 2016 and first published on 09 Jun 2016


Article type: Paper
DOI: 10.1039/C6SM00019C
Citation: Soft Matter, 2016,12, 5926-5936
  • Open access: Creative Commons BY license
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    Glass transitions in native silk fibres studied by dynamic mechanical thermal analysis

    J. Guan, Y. Wang, B. Mortimer, C. Holland, Z. Shao, D. Porter and F. Vollrath, Soft Matter, 2016, 12, 5926
    DOI: 10.1039/C6SM00019C

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