Hybrid Cellulose Nanocrystal-Bonded Carbon Nanotubes/Carbon Fiber Polymer Composites for Structural Applications
Hybrid Cellulose Nanocrystal-Bonded Carbon Nanotubes/Carbon Fiber Polymer Composites for Structural Applications
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DOI：
10.1021/acsanm.0c00785
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发表时间：
2020-06-26
影响因子：
5.9
通讯作者：
Asadi, Amir
中科院分区：
文献类型：
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作者：
Shariatnia, Shadi;Kumar, Annuatha, V;Asadi, Amir
将碳纳米管（CNT）集成到碳纤维增强聚合物（CFRP）复合材料中可以增强结构和功能特性;然而，它通常涉及化学官能化或导致CNT不均匀分散和不均匀分布的过程，这会损害最终性能并阻碍制造可扩展性。在此，我们提出了一种新的和可扩展的处理技术，将原始的碳纳米管（pCNTs）到CFRP复合材料，而不需要化学官能化或添加表面活性剂。我们使用纤维素纳米晶体（CNCs）作为辅助纳米材料，以均匀分散和稳定的pCNT在水中，然后我们涂敷碳纤维（CF）与CNC-pCNT之前，树脂灌注。使用两种涂层方法：简单浸渍（I-涂层）和同时浸渍和超声处理（IS-涂层）。涂覆的CF的表面化学表明，与IS-涂覆相比，I-涂覆在含有CNC-pCNT的涂覆的CF中提供更高量的极性氧基团。我们表明，通过将0.2重量%的CNC-0.2重量%的pCNT在CFRP复合材料中使用这种简单的技术制造混合CFRP增强了33%的弯曲强度和35%的层间剪切强度（ILSS）相比，那些纯CFRP。值得注意的是，与具有单独官能化CNT（fCNT）或CNC的复合材料中的最大增强相比，0. 2CNC-0. 2 pCNT-CFRP显示出类似于25%的更高的弯曲强度和ILSS，证明了CNC-pCNT在增强性能方面的协同效应。此外，我们的研究结果表明，纳入CNC-pCNT增加的CF的热稳定性相比，那些的fCNT。这些在结构应用中使用的复合材料中特别重要。这些结果突出表明，引入的CNC使能加工技术是制造混合复合材料的潜在可扩展路径，其可以增强高于单个CNT或CNC的性能，避免昂贵和/或时间效率低下的功能化过程。
Integrating carbon nanotubes (CNTs) in carbon-fiber-reinforced-polymer (CFRP) composites enhances structural and functional properties; however, it often involves chemical functionalization or processes that lead to inhomogeneous dispersion and nonuniform distribution of CNTs that impair the final properties and hinder manufacturing scalability. Herein, we present a novel and scalable processing technique to integrate pristine CNTs (pCNTs) into CFRP composites without the need for chemical functionalization or addition of surfactants. We use cellulose nanocrystals (CNCs) as assisting nanomaterials to uniformly disperse and stabilize pCNTs in water, and then we coat carbon fibers (CFs) with CNC-pCNT prior to resin infusion. Two coating methods are used: simple immersion (I-coating) and simultaneous immersion and sonication (IS-coating). The surface chemistry of coated CFs reveals that I-coating provides a higher quantity of polar oxygen groups in coated CFs containing CNC-pCNT compared to IS-coating. We show that fabricating hybrid CFRPs by incorporating 0.2 wt % CNC-0.2 wt % pCNT in CFRP composites using this simple technique enhances the flexural strength by 33% and the interlaminar shear strength (ILSS) by 35% compared to those of neat CFRPs. Significantly, 0.2CNC-0.2pCNT-CFRPs show similar to 25% higher flexural strength and ILSS compared to the largest enhancement in composites with individual functionalized CNTs (fCNTs) or CNCs, demonstrating a synergistic effect of CNC-pCNT in enhancing properties. Moreover, our results indicate that incorporating CNC-pCNT increases the thermal stability of CFs compared to those of fCNTs. These are specifically crucial in composites used in structural applications. These results highlight that the introduced CNC-enabled processing technique is a potential scalable path toward the fabrication of hybrid composites that can enhance properties higher than individual CNTs or CNCs, avoiding costly and/or time-inefficient functionalization processes.