有机酸二次掺杂超疏水聚苯胺的制备及其耐蚀性

Preparation and Corrosion Resistance of Super-Hydrophobic Organic Acid Re-doped Polyaniline

利用化学氧化法在硫酸体系中合成掺杂态聚苯胺,用氨水脱掺杂得到本征态聚苯胺,再采用对甲苯磺酸(TSA)、柠檬酸(CA)及十二烷基苯磺酸(DBSA)对本征态聚苯胺进行二次掺杂得到超疏水聚苯胺。通过傅里叶红外光谱(FTIR)、扫描电镜(SEM)等对聚苯胺进行了结构表征和形貌观察,通过电化学测试研究了在3.5%NaCl溶液中超疏水性聚苯胺的耐蚀性。结果表明:三种有机酸二次掺杂均能够有效提高聚苯胺的疏水性及耐蚀性,并且随着聚苯胺疏水性的增强,其对不锈钢的腐蚀防护效果提高;其中,TSA二次掺杂的聚苯胺的疏水性和耐蚀性最强。

Polyaniline emeraldine base（PANI-EB）was prepared through systhesis of doped polyaniline by oxidative polymerization method in sulfuric acid system and then de-doping by ammonia solution.And then,the polyaniline emeraldine base was re-doped with three different organic acids,p-toluenesulfonic acid（TSA）,citric acid（CA）and dodecylbenzene sulfonic acid（DBSA）,to form super-hydrophobic structure.The structure and morphology of the prepared polyaniline were characterized with Fourier transform infrared（FT-IR）and scanning electron microscopy（SEM）.Corrosion resistance of the super-hydrophobic polyaniline was studied by electrochemical testing in 3.5%NaCl solution.The results show that the re-doping of organic acids could improve the hydrophobicity and anticorrosion of organic acid re-doped polyaniline effectively,and their anticorrosion performance improved with the increase of wettability.TSA re-doped polyaniline exhibited the best wettability and anticorrosion.