Silanized MXene/Carbon Nanotube Composites as a Shielding Layer of Polyurethane Coatings for Anticorrosion

作者：Yuzhou Wang, Wenjing Chang, Zhuo Wang, Junpeng Ma, Xiang Yu, Yue Li, Lianzhong Zhang · 发表于：ACS Applied Nano Materials · 年份：2022 · DOI：10.1021/acsanm.1c03953 · 被引用次数：43 · 研究领域：MXene and MAX Phase Materials、Advanced Sensor and Energy Harvesting Materials、Fuel Cells and Related Materials

Two-dimensional Ti 3 C 2 T x flakes have been studied as nanofillers in anticorrosive coatings, but their poor dispersion and interfacial interaction in coatings limit their application. In this study, we report silanized Ti 3 C 2 T x /carbon nanotube (CNT) nanocomposite as a shielding layer for waterborne polyurethane (WPU) coatings, which makes the WPU coatings have enhanced anticorrosion properties. [3-(2-Aminoethylamino)-propyl] trimethoxysilane (AEAPTMS) is used to make the Ti 3 C 2 T x surface electropositive, and sodium dodecylbenzene sulfonate (SDBS)-functionalized CNTs (S-CNTs) with negative charges on the surface are used to form highly dispersed composite nanofillers with Ti 3 C 2 T x through electrostatic interaction. The functionalized surfaces of Ti 3 C 2 T x and S-CNTs form an effective shielding layer in the coating, which effectively prevents the penetration of corrosive electrolytes. The results reveal that the AEAPTMS-functionalized Ti 3 C 2 T x (A-Ti 3 C 2 T x ) and S-CNTs synergistically enhanced the anticorrosion performance of the WPU coatings. After 120 days of immersion, the impedance of the A-Ti 3 C 2 T x /S-CNTs/WPU composite coating at 0.01 Hz is still 4.2568 × 10 7 Ω cm 2 . This improved performance depends on the good dispersibility and interface compatibility of the surface-functionalized Ti 3 C 2 T x and S-CNTs in the coating layer. The prepared coating described in this study presents a great potential for practical protective coating applicat...