Effect of Carboxymethyl Cellulose (CMC) Functionalization on Dispersion, Mechanical, and Corrosion Properties of CNT/Epoxy Nanocomposites
Effect of Carboxymethyl Cellulose (CMC) Functionalization on Dispersion, Mechanical, and Corrosion Properties of CNT/Epoxy Nanocomposites
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DOI：
10.1007/s10118-023-2928-0
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发表时间：
2023-01
影响因子：
4.3
通讯作者：
Dawei Zhang;Leonard Chia;Ying Huang
中科院分区：
文献类型：
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作者：
Dawei Zhang;Leonard Chia;Ying Huang
碳纳米管/环氧纳米复合材料具有许多先进的性能，具有很大的发展潜力。然而，碳纳米管分散体的均匀化仍然是纳米复合材料研究领域的一大挑战。本研究采用一种新型分散剂羧甲基纤维素（CMC）对碳纳米管进行功能化，提高碳纳米管在环氧树脂中的分散性能。通过机械混合和常用表面活性剂十二烷基苯磺酸钠（NaDDBS）对CNT/环氧纳米复合材料在三种不同CNT浓度（0.1%、0.3%和0.5%）下的分散性能、机械性能和腐蚀性能的影响，比较了CMC功能化的效果。拉曼光谱、粒径分析和透射电镜实验结果表明，CMC功能化CNTs比NaDDBS功能化和机械混合的CNTs更有效地减小了碳纳米管簇大小，表明碳纳米管的分散性更好。与机械混合和NaDDBS功能化CNTs相比，CMC功能化CNTs的峰值粒径分别减少了54% （0.1% CNT浓度）和16% （0.3% CNT浓度）。压缩试验发现，由于分散性较好，CMC功能化的CNT/环氧纳米复合材料的抗压强度和弹性模量分别比机械混合和NaDDBS功能化（0.1% CNT浓度）的CNT/环氧纳米复合材料提高了189%和66%，弹性模量分别提高了224%和50%。电化学腐蚀试验也表明，经CMC功能化的CNT/环氧纳米复合材料具有最低的腐蚀速率（0.214 mpy）、最高的耐蚀性（201.031 Ω·cm2）和最低的孔隙密度（0.011%）。
Carbon nanotube (CNT)/epoxy nanocomposites have a great potential of possessing many advanced properties. However, the homogenization of CNT dispersion is still a great challenge in the research field of nanocomposites. This study applied a novel dispersion agent, carboxymethyl cellulose (CMC), to functionalize CNTs and improve CNT dispersion in epoxy. The effectiveness of the CMC functionalization was compared with mechanical mixing and a commonly used surfactant, sodium dodecylbenzene sulfonate (NaDDBS), regarding dispersion, mechanical and corrosion properties of CNT/epoxy nanocomposites with three different CNT concentrations (0.1%, 0.3% and 0.5%). The experimental results of Raman spectroscopy, particle size analysis and transmission electron microscopy showed that CMC functionalized CNTs reduced CNT cluster sizes more efficiently than NaDDBS functionalized and mechanically mixed CNTs, indicating a better CNT dispersion. The peak particle size of CMC functionalized CNTs reduced as much as 54% (0.1% CNT concentration) and 16% (0.3% CNT concentration), compared to mechanical mixed and NaDDBS functionalized CNTs. Because of the better dispersion, it was found by compressive tests that CNT/epoxy nanocomposites with CMC functionalization resulted in 189% and 66% higher compressive strength, 224% and 50% higher modulus of elasticity than those with mechanical mixing and NaDDBS functionalization respectively (0.1% CNT cencentration). In addition, electrochemical corrosion tests also showed that CNT/epoxy nanocomposites with CMC functionalization achieved lowest corrosion rate (0.214 mpy), the highest corrosion resistance (201.031 Ω·cm2), and the lowest porosity density (0.011%).