Bending-Spinning Produces Silkworm and Spider Silk with Enhanced Mechanical Properties
Bending-Spinning Produces Silkworm and Spider Silk with Enhanced Mechanical Properties
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DOI：
10.1021/acs.macromol.2c00868
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发表时间：
2023-02-01
期刊：
影响因子：
5.5
通讯作者：
Xia, Qingyou
中科院分区：
文献类型：
--
作者：
Peng, Zhangchuan;Hu, Wenbo;Xia, Qingyou
天然的吐丝行为赋予新鲜分泌（FS）丝弯曲角。这种现象在蚕和蜘蛛中很普遍，但仍然无法解释。结果表明，家蚕新鲜分泌丝（FS-S）的角为70.23 ° ~ 87.93 °，蜘蛛新鲜分泌丝（FS-MA）的角为0 ° ~ 50 °。此外，FS-S丝和FS-MA丝在弯曲后的力学性能发生变化，随着弯曲角度的增大（0 ° ~ 360 °），力学性能先增大后减小。力学性能最好的FS-S丝对应的角度为67.5度~ 90度，FS-MA丝对应的角度为45度。结构分析表明，β-折叠，结晶度和晶体尺寸增加与弯曲角度和取向度下降与弯曲角度。微观结构的规律性变化解释了力学性能随弯曲角度变化的趋势。这些发现表明，弯曲纺纱生产的蚕丝和蜘蛛丝具有增强的机械性能。
Natural silk-spinning behavior endows freshly secreted (FS) silk with a bending angle. This phenomenon is universal among silkworms and spiders but remains unexplained. In this study, the angle of freshly secreted silkworm (FS-S) silk was revealed to be 70.23 degrees-87.93 degrees and that of freshly secreted spider major ampullate (FS-MA) silk to be 0 degrees-50 degrees. Furthermore, the mechanical properties of FS-S silk and FS-MA silk changed after bending, first increasing and then decreasing as the bending angle was increased (0 degrees-360 degrees). The angle corresponding to FS-S silk with the best mechanical properties is 67.5 degrees-90 degrees, and for FS-MA silk, it is 45 degrees. Structural analysis showed that the beta-sheet, crystallinity, and crystal size increased with bending angle and the orientation decreased with bending angle. Regular change of microstructure explains the trend for the mechanical property change with bending angle. These findings suggest that bending- spinning produces silkworm and spider silk with enhanced mechanical properties.