Structural Impact of Graphene Nanoribbon on Mechanical Properties and Anti-corrosion Performance of Polyurethane Nanocomposites
Structural Impact of Graphene Nanoribbon on Mechanical Properties and Anti-corrosion Performance of Polyurethane Nanocomposites
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DOI：
10.1016/j.cej.2020.126858
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发表时间：
2021-02-01
影响因子：
15.1
通讯作者：
Yu, Aiping
中科院分区：
文献类型：
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作者：
Habibpour, Saeed;Um, Jun Geun;Yu, Aiping
在这项研究中，石墨烯纳米管（GNR）是通过氧化解链的多壁碳纳米管（MWCNT）集成高纵横比的功能与平面结构的石墨烯。然后，利用单轴拉伸测试和电化学阻抗谱（EIS）研究了聚氨酯（PU）纳米复合材料的结构（形状和长径比）对其力学性能和耐腐蚀性能的影响。将结果与具有管状高纵横比的MWCNT和具有平面低纵横比结构的石墨烯纳米片（GNP）进行比较。PU-填料纳米复合材料与不同的纳米粒子负载产生和施加到冷轧钢基板的机械和抗腐蚀测量。作为纳米复合填料，MWCNT在力学性能方面表现良好，GNP表现出更高的耐腐蚀性能。然而，PU-GNR在机械性能和耐腐蚀性方面都很突出。0.5 wt% PU-GNR纳米复合材料的杨氏模量达到3.52 MPa，分别是PU-GNP（2.19 MPa）和PU-MWCNT（2.52 MPa）的约1.6和1.4倍。此外，与具有5.14 x 10（5）Ω. cm（2）的PU-GNP和具有4.09 x 10（5）Ω. cm（2）的PU-MWCNT相比，PU-GNR表现出8.45 x 10（5）www.example.com（2）的最高耐腐蚀性。Omega.cm PU-GNR纳米复合材料的优异性能归因于其平面结构、高长径比、均匀分散和良好的聚合物-填料相互作用。它们不仅有助于提高纳米复合材料的承载性能，而且还有助于建立一个曲折的通道，抑制腐蚀剂向PU基体的扩散。
In this study, graphene nanoribbon (GNR) was produced through oxidative unzipping of multiwalled carbon nanotube (MWCNT) to integrate high aspect ratio features of MWCNT with a planar structure of the graphene. Afterward, its structural effect (shape and aspect ratio) on mechanical and anti-corrosion performance of polyurethane (PU) nanocomposites was thoroughly investigated utilizing uniaxial tensile measurement and electrochemical impedance spectroscopy (EIS). The results were compared to MWCNT with tubular high aspect ratio and graphene nanoplatelet (GnP) with a planar low aspect ratio structure. PU-filler nanocomposites were produced with different nanoparticle loadings and applied to a cold rolled steel substrate for mechanical and anti-corrosion measurements. As a nanocomposite filler, MWCNT performs well in terms of mechanical properties, and GnP shows higher anti-corrosion performance. However, PU-GNR pronounces in both mechanical properties and corrosion resistance. Young's modulus of 0.5 wt% PU-GNR nanocomposite reaches 3.52 MPa, which is around 1.6 and 1.4 times higher than the PU-GnP (2.19 MPa) and PU-MWCNT (2.52 MPa), respectively. Furthermore, PU-GNR exhibits the highest corrosion resistance of 8.45 x 10(5) Omega.cm(2) compared to PU-GnP with 5.14 x 10(5) Omega.cm(2) and PU-MWCNT with 4.09 x 10(5) Omega.cm(2). The better performance of the PU-GNR nanocomposites is attributed to the planar structure, high aspect ratio, uniform dispersion and better polymer-filler interactions. They contribute to not only improve load-bearing properties of the nanocomposite but also build a tortuous pathway suppressing corrosive agents' diffusion to the PU matrix.