有机酸二次掺杂超疏水聚苯胺的制备及其耐蚀性
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摘要
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.
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.
引文
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[3]LU W K,ELSENBAUMER R L,WESSLING B.Corrosion protection of mild steel by coatings containing polyaniline[J].Synthetic Metals,1995,71(1/3):2163-2166.
[4]徐惠,李俊玲,彭振军,等.聚苯胺/聚吡咯复合薄膜电极的制备及其超电容和耐腐蚀性[J].高分子材料科学与工程,2013,29(10):133-137.
[5]邵亮,冯辉霞,邱建辉,等.酸掺杂聚苯胺及其防腐涂料的研究[J].涂料工业,2008,38(7):53-55.
[6]WENG C J,CHANG C H,LIN L I,et al.Advanced anticorrosion coating materials prepared from fluoropolyaniline-silica composites with synergistic effect of superhydrophobicity and redox catalytic capability[J].Surface&Coating Technology,2012,207:42-49.
[7]邢翠娟,于良民,张志明.超疏水性聚苯胺微/纳米结构的合成及防腐蚀性能[J].高等学校化学学报,2013,34(8):1999-2004.
[8]BAO X M,CUI J F,SUN H X,et al.Facile preparation of superhydrophobic surfaces based on metal oxidenanoparticles[J].Applied Surface Science,2014,303:473-480.
[9]MONTEMOR M F.Functional and smart coatings for corrosion protection:a review of recent advances[J].Surface&Coating Technology,2014,258:17-37.
[10]QING Y Q,YANG C N,SUN Y Z,et al.Facile fabrication of superhydrophobic surfaces with corrosion resistance by nanocomposite coating of TiO2 and polydimethylsiloxane[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2015,484:471-477.
[11]杨显,杨小刚,马新起.功能酸二次掺杂聚苯胺的防腐蚀性能[J].化工学报,2014,65(9):2738-2743.
[12]MORGAN H,FOOT P J S.The effects of composition and processing variables on the properties of thermoplastic polyaniline blends and composites[J].Journal Material Science,2001,36:5369-5377.
[13]徐惠,张宝骞,陈泳,等.复合酸掺杂的聚苯胺对Cr(VI)的吸附性能[J].功能材料,2014,45(22):22046-22050.
[14]PANAH N B,PAYEHGHADR M,DANAEE I,et al.Investigation of corrosion performance of epoxy coating containing polyaniline nanoparticles[J].Iranian Polymer Journal,2012,21:747-754.
[15]VERONESE F M.Peptide and protein PEGylation:a review of problems and solutions[J].Biomaterials,2001,22:405-417.
[16]FENG L B,ZHU Y L,FAN W B,et al.Fabrication and corrosion resistance of superhydrophobic magnesium alloy[J].Applied Physics A,2015,120(2):561-570.
[17]王建雄,郭清萍,郭有军.聚苯胺防腐蚀涂料的研究现状[J].腐蚀与防护,2008,29(4):211-215.
[18]孙毅,钟发春,舒远杰.聚苯胺的腐蚀防护机理及其在金属防腐中的应用[J].材料导报,2009,23(7):65-68.
[19]方瑞萍,陕绍云,李星,等.聚苯胺防腐涂料的研究进展[J].化工新型材料,2013,41(5):19-21.
[20]邢翠娟,于良民,张志明.超疏水性聚苯胺微/纳米结构的合成及防腐蚀性能[J].高等学校化学学报,2013,34(8):1999-2004.