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Bioinspired Bouligand cellulose nanocrystal composites: a review of mechanical properties

机译:生物启发的Bouligand纤维素纳米晶体复合材料:力学性能的审查。

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摘要

The twisted plywood, or Bouligand, structure is the most commonly observed microstructural motif in natural materials that possess high mechanical strength and toughness, such as that found in bone and the mantis shrimp dactyl club. These materials are isotropically toughened by a low volume fraction of soft, energy-dissipating polymer and by the Bouligand structure itself, through shear wave filtering and crack twisting, deflection and arrest. Cellulose nanocrystals (CNCs) are excellent candidates for the bottom-up fabrication of these structures, as they naturally self-assemble into ‘chiral nematic’ films when cast from solutions and possess outstanding mechanical properties. In this article, we present a review of the fabrication techniques and the corresponding mechanical properties of Bouligand biomimetic CNC nanocomposites, while drawing comparison to the performance standards set by tough natural composite materials.This article is part of a discussion meeting issue ‘New horizons for cellulose nanotechnology’.
机译:扭曲的胶合板结构或Bouligand结构是天然材料中最常见的微观结构图案,这些材料具有很高的机械强度和韧性,例如骨骼和螳螂虾的dactyl club中所发现的。这些材料通过低体积分数的柔软的耗能聚合物和Bouligand结构本身,通过剪切波滤波和裂纹扭曲,偏转和阻止而各向同性地变硬。纤维素纳米晶体(CNC)是自下而上制造这些结构的极佳选择,因为当从溶液浇铸时,它们自然地自组装成“手性向列”膜,并具有出色的机械性能。在本文中,我们对Bouligand仿生CNC纳米复合材料的制造技术和相应的机械性能进行了综述,同时与硬质天然复合材料设定的性能标准进行了比较。纤维素纳米技术”。

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