The role of functionalized graphene oxide on the mechanical and anti-corrosion properties of polyurethane coating
The role of functionalized graphene oxide on the mechanical and anti-corrosion properties of polyurethane coating
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DOI：
10.1016/j.jtice.2018.02.009
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发表时间：
2018-05-01
影响因子：
5.7
通讯作者：
Saeb, Mohammad Reza
中科院分区：
文献类型：
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作者：
Haghdadeh, Pooneh;Ghaffari, Mehdi;Saeb, Mohammad Reza
聚氨酯（PU）由于其高柔韧性和良好的抗紫外线性而被广泛应用。已经进行了广泛的尝试，以通过包含纳米材料来改善该涂层的耐腐蚀性和机械性能。在这项研究中，氧化石墨烯纳米片，共价官能化的（3-缩水甘油氧基丙基）三甲氧基硅烷，被引入到聚氨酯基体，以加强上述弱点。采用傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）、场发射扫描电镜（FE-SEM）、紫外可见光谱（UV-vis）和热重分析（TGA）对改性前后的氧化石墨烯纳米片（GO）进行了表征。通过动态力学热分析（DMTA）和拉伸试验对GO和fGO纳米片增强PU涂层的物理机械性能进行了表征。通过SEM分析研究了GO和fGO纳米片对拉伸试验后PU涂层断裂表面形貌的影响。此外，通过盐雾试验和电化学阻抗谱（EIS）对聚氨酯涂层的防腐蚀性能进行了表征。结果证实了在掺入fGO纳米片之后PU涂层的物理机械和抗腐蚀性能增强。拉伸应力、断裂能、损耗因子和储能模量值通过添加fGO纳米片而显著增加。用（3-缩水甘油氧基丙基）三甲氧基硅烷改性后，fGO在PU基体中的稳定性和分散性得到改善。聚氨酯涂层-fGO纳米片之间的界面键显着增强。除了实验，理论量子力学方法被用来研究三甲氧基硅烷与聚氨酯和GO表面的相互作用。(C)2018台湾化学工程师学会。Elsevier B. V.出版，保留所有权利。
Polyurethane (PU) has been commonly used in a wide range of applications due to its high flexibility and good UV resistance. Attempts have been extensively carried out to improve the corrosion resistance and mechanical properties of this coating through inclusion of nanomaterials. In this study the graphene oxide nanosheets, covalently functionalized by (3-glycidyloxypropyl) trimethoxysilane, were introduced into the PU matrix to enhance the mentioned weaknesses. The modified (fGO) and unmodified-graphene oxide nanosheets (GO) were characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD) analysis, field emission-scanning electron microscopy (FE-SEM), UV-vis and thermal gravimetric analysis (TGA). The physical-mechanical properties of the PU coatings reinforced with GO and fGO nanosheets were characterized by dynamic mechanical thermal analysis (DMTA) and tensile test. The influence of GO and fGO nanosheets on the fractured surface morphology of the PU coating after tensile test was studied by SEM analysis. In addition, the corrosion protection properties of the mild steel panels coated with PU coatings were characterized by salt spray test and electrochemical impedance spectroscopy (EIS). The results affirmed the physical-mechanical and anti-corrosion properties enhancement of the PU coating after incorporation of fGO nanosheets. The tensile stress, energy at break, loss factor and storage modulus values were significantly increased by addition of fGO nanosheets. The fGO stability and dispersion in the PU matrix was improved after modification with (3-glycidyloxypropyl) trimethoxysilane. The interfacial bonds between the polyurethane coating-fGO nanosheets were significantly enhanced. Besides the experiments, theoretical quantum mechanics approaches were utilized to examine the interactions of trimethoxysilane with polyurethane and GO surface. (C) 2018 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.