通过拉伸过程中的原位结构研究了解碳纳米管纤维中的协同载荷
Understanding cooperative loading in carbon nanotube fibres through in-situ structural studies during stretching
摘要：
碳纳米管（CNT）纤维被牢固地确立为一种新的高性能纤维，但它们的拉伸机械性能仍然是构成CNT的那些的相对较小的部分。明确的结构-性能关系和精确的力学模型是弥合这一差距的迫切要求。在这项工作中，我们分析了在拉伸变形过程中，通过进行原位同步辐射宽角和小角X射线散射和拉曼光谱的碳纳米管纤维的结构演变和分子应力转移。结果表明，碳纳米管纤维可以准确地描述为网络的束，根据材料的初始取向分布函数的Weibull分布逐步滑动。该模型解释了CNT排列和协同加载程度的影响，如在不同拉伸比下生产的纤维所示。它还有助于解释直接纺丝法生产的CNT纤维具有异常高的韧性（断裂能），这是结构材料抗冲击性的关键特性。
英文摘要：
Carbon nanotube (CNT) fibres are firmly established as a new high-performance fibre, but their tensile mechanical properties remain a relatively small fraction of those of the constituent CNTs. Clear structure-property relations and accurate mechanical models are pressing requirements to bridge this gap. In this work we analyse the structural evolution and molecular stress transfer in CNT fibres by performing in-situ synchrotron wide- and small-angle X-ray scattering and Raman spectroscopy during tensile deformation. The results show that CNT fibres can be accurately described as network of bundles that slide progressively according to the initial orientation distribution function of the material following a Weibull distribution. This model decouples the effects of CNT alignment and degree of cooperative loading, as demonstrated for fibres produced at different draw ratios. It also helps explain the unusually high toughness (fracture energy) of CNT fibres produced by the direct spinning method, a key property for impact resistance in structural materials, for example.
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