有色金属材料与工程2025，Vol.46Issue(2)：76-81,6.DOI:10.13258/j.cnki.nmme.20230426001
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
摘要
Abstract
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.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Key words
mesoporous silica/benzotriazole/polyethyleneimine/pH-controlled release/polyurethane coating分类
金属材料引用本文复制引用
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):76-81,6.基金项目
上海市科学技术委员会科研计划项目(17511101603) （17511101603）
