Cellulose Nanocrystal-Enabled Tailoring of the Interface in Carbon Nanotube- and Graphene Nanoplatelet-Carbon Fiber Polymer Composites: Implications for Structural Applications
Cellulose Nanocrystal-Enabled Tailoring of the Interface in Carbon Nanotube- and Graphene Nanoplatelet-Carbon Fiber Polymer Composites: Implications for Structural Applications
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DOI：
10.1021/acsanm.1c03860
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发表时间：
2022-01
影响因子：
5.9
通讯作者：
Ozge Kaynan;L. M. Pérez;A. Asadi
中科院分区：
文献类型：
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作者：
Ozge Kaynan;L. M. Pérez;A. Asadi
纤维素纳米晶体（CNC）使得能够用原始碳纳米管（CNT）和石墨烯纳米片（GNP）有效地涂覆碳纤维（CF）。在这里，我们阐明的机制，形成界面的CNC键合的CNT和CNC键合的GnP-CF增强聚合物（CFRP）复合材料，适用于结构应用。我们发现，CNCs提供了一个合适的平台，工程混杂复合材料的接口。我们证明了杂化纳米材料，即，CNC和CNT/GNP改变了界面的化学组成及其特性，尽管CNT和GNP的元素组成相似，但所生产的复合材料的机械特性不同。我们的研究结果表明，CNC-CNT和CNC-GNP的存在下创建一个4 μm的界面区域，导致界面剪切强度增加200和145%，层间剪切强度分别增加46和28%。此外，密度泛函理论计算表明，CNC-CNT和CF施胶剂之间的结合能比CNC-GNP高14%，这强调了化学和物理相互作用对观察到的机械性能差异的影响。从这项研究中获得的理解强调了一条自下而上制造混合复合材料的道路，该复合材料具有从分子水平和纳米级到更高尺度的工程微结构和性能。
Cellulose nanocrystals (CNCs) enable the effective coating of carbon fibers (CFs) with pristine carbon nanotubes (CNTs) and graphene nanoplatelets (GnPs). Herein, we articulate the mechanisms that form the interface of CNC-bonded CNT and CNC-bonded GnP-CF reinforced polymer (CFRP) composites that are suitable for structural applications. We show that CNCs provide a suitable platform to engineer the interface of hybrid composites. We demonstrate that the hybrid nanomaterials, i.e., CNC and CNT/GnP, alter the chemical composition of the interface and its properties, and despite the similar elemental composition of the CNT and GnP, the mechanical properties of the produced composites differ. Our results show that the presence of CNC–CNT and CNC–GnP creates a 4 μm interfacial region that leads to a 200 and 145% increase in interfacial shear strength and a 46 and 28% enhancement in interlaminar shear strength, respectively. Furthermore, density functional theory calculations show that the binding energy between the CNC–CNT and CF sizing agent is 14% higher than that of CNC–GnP underlining the effect of chemical and physical interactions in the observed difference in mechanical properties. The understanding gained from this study highlights a path forward bottom-up manufacturing of hybrid composites with an engineered microstructure and properties from the molecular level and nanoscale to higher scales.