Olivieri Federico, Scherillo Fabio, Castaldo Rachele, Cocca Mariacristina, Squillace Antonino, Gentile Gennaro, Lavorgna Marino
Institute of Polymers Composites and Biomaterials, National Research Council of Italy, Via Campi Flegrei, 34, 80078 Pozzuoli, NA, Italy.
Department of Chemical, Materials and Industrial Production Engineering, University of Naples Federico II, P.le Tecchio 80, 80125 Naples, Italy.
ACS Appl Polym Mater. 2023 Jul 12;5(8):5917-5925. doi: 10.1021/acsapm.3c00585. eCollection 2023 Aug 11.
Smart polymer coatings embedding stimuli-responsive corrosion inhibitor nanocarriers are commonly exploited, in the literature, for the development of high-performance active coatings. In this work, high-surface-area amino-functionalized mesoporous silica nanoparticles (MSN-NH) were developed with a one-step synthesis process and then functionalized with benzoyl chloride (MSN-BC) through a reaction with amino groups. MSN-BC are able to release benzoic acid (BA) in acid and alkaline conditions as a result of the hydrolysis of the pH-sensitive amide bond. MSN-BC were embedded in polymer coatings to exploit the pH-dependent release of corrosion-inhibiting BA. After an in-depth characterization of the developed functional nanoparticles and of their pH-dependent release kinetics of BA, MSN-BC were embedded in an acrylic matrix, realizing coatings for the corrosion protection of aluminum AA2024 alloys. Results demonstrate the effectiveness of the nanoparticles' porous structure for a high loading of the anticorrosive active agent BA and the long-lasting efficiency of the coating for the corrosion protection of aluminum alloys, as validated by morphological and electrochemical impedance spectroscopy (EIS) measurements. EIS experiments were carried out with up to 21 days of exposure to a corrosive environment, revealing the potentialities of the acrylic coatings embedding MSN-BC for the protection of aluminum alloys.
在文献中，嵌入刺激响应型缓蚀剂纳米载体的智能聚合物涂层常用于开发高性能活性涂层。在这项工作中，通过一步合成法制备了高比表面积的氨基功能化介孔二氧化硅纳米颗粒（MSN-NH），然后通过与氨基反应使其与苯甲酰氯（MSN-BC）功能化。由于pH敏感酰胺键的水解，MSN-BC能够在酸性和碱性条件下释放苯甲酸（BA）。将MSN-BC嵌入聚合物涂层中，以利用缓蚀性BA的pH依赖性释放。在对所开发的功能纳米颗粒及其BA的pH依赖性释放动力学进行深入表征之后，将MSN-BC嵌入丙烯酸基体中，制备出用于保护AA2024铝合金的涂层。形态学和电化学阻抗谱（EIS）测量结果验证了纳米颗粒多孔结构对高负载防腐活性剂BA的有效性以及涂层对铝合金防腐的长效效率。进行了长达21天暴露于腐蚀环境的EIS实验，揭示了嵌入MSN-BC的丙烯酸涂层对铝合金的保护潜力。
