Valentini Luca, Bittolo Bon Silvia, Pugno Nicola M
Dipartimento di Ingegneria Civile e Ambientale, Università di Perugia, UdR INSTM Strada di Pentima 4 05100 Terni Italy
Laboratory of Bio-Inspired and Graphene Nanomechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento Via Mesiano 77 Trento Italy
RSC Adv. 2018 Feb 28;8(17):9063-9069. doi: 10.1039/c7ra13708g.
In this study, we present a simple method to prepare and control the structure of regenerated hybrid silkworm silk films through icing. A regenerated hybrid silk (RHS) film consisting of a micro-fibrillar structure was obtained by partially dissolving amino-functionalized polyhedral oligomeric silsesquioxanes (POSS) and silk fibers in a CaCl-formic acid solution. After immersion in water and icing, the obtained films of RHS showed polymorphic and strain-stiffening behaviors with mechanical properties that were better than those observed in dry or wet-regenerated silk. It was also found that POSS endowed the burning regenerated silk film with anti-dripping properties. The higher β-sheet content observed in the ice-regenerated hybrid micro-fibrils indicates a useful route to fabricate regenerated silk with physical and functional properties, strain-stiffening, similar to those observed to date in natural spider silk counterpart and synthetic rubbers, and anti-dripping of the flaming melt. Related carbon nanotube composites are considered for comparison.
在本研究中，我们提出了一种通过结冰来制备和控制再生杂化蚕丝膜结构的简单方法。通过将氨基官能化的多面体低聚倍半硅氧烷（POSS）和丝纤维部分溶解在氯化钙-甲酸溶液中，获得了具有微纤维结构的再生杂化丝（RHS）膜。将所得的RHS膜浸入水中并结冰后，其表现出多晶型和应变硬化行为，其机械性能优于在干态或湿态再生丝中观察到的性能。还发现POSS赋予燃烧的再生丝膜抗滴落性能。在冰再生杂化微纤维中观察到的较高β-片层含量表明了一种制备具有物理和功能特性（应变硬化，类似于迄今为止在天然蜘蛛丝对应物和合成橡胶中观察到的特性）以及燃烧熔体抗滴落性能的再生丝的有效途径。考虑了相关的碳纳米管复合材料用于比较。
