| 徐思远,李静.pH控制释放型纳米容器的制备及其涂层[J].有色金属材料与工程,2025,46(2):76-81. |
| pH控制释放型纳米容器的制备及其涂层 |
| Preparation of pH controlled release nanocontainers and their coatings |
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| DOI：10.13258/j.cnki.nmme.20230426001 |
| 中文关键词: 介孔二氧化硅 苯并三唑 聚乙烯亚胺 pH控制释放 聚氨酯涂层 |
| 英文关键词:mesoporous silica benzotriazole polyethyleneimine pH-controlled release polyurethane coating |
| 基金项目:上海市科学技术委员会科研计划项目(17511101603) |
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| 中文摘要: |
| 制备了介孔二氧化硅纳米粒子（mesoporous silica nanoparticle, MSN）作为纳米容器。先将缓蚀剂苯并三唑（benzotriazole, BTA）装载到MSN中（记为MSN-BTA），再用聚乙烯亚胺（polyethyleneimine, PEI）包裹MSN-BTA，最终将装载BTA并完成PEI封装的MSN-BTA-PEI复合纳米容器添加到水性聚氨酯（waterborne polyurethane, WPU）涂层中。通过扫描电子显微镜（scanning electron microscope, SEM）、比表面积孔隙度分析仪（Brunauer-Emmett-Teller apparatus, BET）、傅里叶变换红外光谱仪（Fourier transform infrared spectrometer, FT-IR）、热重分析仪（thermal gravimetric analyzer, TGA）、紫外可见分光光度计（ultraviolet-visible spectrophotometer, UV-Vis）等测试设备，并结合电化学测试，对MSN-BTA-PEI复合纳米容器的形貌、结构、装载率、累积释放率及耐蚀性能进行了分析。结果表明：MSN纳米容器的比表面积为866.37 m2/g，孔容为0.57 cm3/g，这样的结构特点有利于对其进行改性以及装载BTA；改性后的MSN纳米容器含有羧基（―COOH），其―COOH可以与PEI分子链上的氨基（―NH2）结合；MSN-BTA-PEI复合纳米容器对BTA的装载率（质量分数）为10.3%；未封装PEI的MSN-BTA与MSN-BTA-PEI复合纳米容器在pH为7的条件下，6.5 h后BTA的累积释放率（质量分数）分别为56.3%和36.8%，体现了PEI的封装缓释作用。此外，在pH变化后，BTA的累积释放率在6.5 h时分别为56.2%和76.9%，体现了pH对BTA释放的控制作用；添加MSN-BTA-PEI复合纳米容器的WPU涂层的腐蚀电流密度比WPU涂层的减小了7.3%，表明其耐蚀性能得到增强。 |
| 英文摘要: |
| Mesoporous silica nanoparticles (MSN) were fabricated as nanocontainers. Initially, the corrosion inhibitor benzotriazole (BTA) was loaded into the MSN (denoted as MSN-BTA). Subsequently, polyethyleneimine (PEI) was used to encapsulate the MSN-BTA, and finally, the MSN-BTA-PEI composite nanocontainers, which had been loaded with BTA and encapsulated with PEI, were incorporated into the waterborne polyurethane (WPU) coating. The morphology, structure, loading rate, cumulative release rate, and corrosion resistance of the MSN-BTA-PEI composite nanocontainers were characterized by a series of techniques, including scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET) surface area analysis, Fourier-transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), ultraviolet-visible spectroscopy (UV-Vis), and electrochemical tests. The results indicate that the MSN nanocontainers show a specific surface area of 866.37 m2/g and a pore volume of 0.57 cm3/g, and this structural feature is beneficial for their modification and loading BTA. The modified MSN nanocontainers possess carboxyl groups (―COOH), and their ―COOH can bond with the amino groups (―NH2) on the PEI molecular chain. The loading rate (mass fraction) of BTA in the MSN-BTA-PEI composite nanocontainers is 10.3%. For the MSN-BTA without PEI encapsulation and MSN-BTA-PEI composite nanocontainers at pH 7, the cumulative release rates (mass fractions) of BTA after 6.5 hours are 56.3% and 36.8%, respectively, reflecting the encapsulation and sustained-release effect of PEI. Moreover, after changing pH, the cumulative release rates of BTA are 56.2% and 76.9% at 6.5 hours , respectively, suggesting the controlling effect of pH on BTA release. The corrosion current density of the WPU coating with MSN-BTA-PEI composite nanocontainers added decreases by 7.3% compared to that of the WPU coating, indicating an enhancement in its corrosion resistance. |
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