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Molecular Interactions and Toughening Mechanisms in Silk Fibroin-Epoxy Resin Blend Films.
Biomacromolecules ( IF 5.5 ) Pub Date : 2019-05-23 , DOI: 10.1021/acs.biomac.9b00260
Kang Yang 1, 2 , Kenjiro Yazawa 2 , Kousuke Tsuchiya 2 , Keiji Numata 2 , Juan Guan 1, 3
Affiliation  

Natural silkworm silks have been applied to reinforce epoxy resin to achieve sub-ambient and impact toughness in the composite. However, the molecular interactions at the silk fiber-matrix interface of the composite are poorly understood. In this work, silk fibroin extracted from Bombyx mori silk is blended with an epoxy resin polymer system to study the molecular interactions between silk fibroin, epoxy compounds, and hardeners. The effects of chemical crosslinks between epoxy groups and hardeners or silk fibroin, as well as physical crosslinks in the β-sheet structure of silk fibroin, were discussed on the thermal stability, glass transition behavior, and mechanical properties of the blend films. A relationship between the crosslinking structure and mechanical properties for the films is proposed to enlighten on the toughening mechanisms. The findings would provide insights into forming strong and tough silk fibroin material as well as understanding the interface interactions of silk-epoxy composites.

中文翻译:

丝素蛋白-环氧树脂共混薄膜中的分子相互作用和增韧机理。

天然蚕丝已被用于增强环氧树脂,以在复合物中实现低于环境的强度和冲击韧性。然而,对复合材料的丝纤维-基质界面处的分子相互作用了解得很少。在这项工作中,将从家蚕丝中提取的丝素蛋白与环氧树脂聚合物体系混合,以研究丝素蛋白,环氧化合物和硬化剂之间的分子相互作用。讨论了环氧基与固化剂或丝素蛋白之间的化学交联以及丝素蛋白β-片层结构中的物理交联对共混膜的热稳定性,玻璃化转变行为和机械性能的影响。提出了膜的交联结构与机械性能之间的关系,以期对增韧机理有所启发。
更新日期:2019-05-09
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