Abstract The compatibility between polypyrrole (PPy) and waterborne epoxy coating (EP) remains the main challenge. Here, phosphorylated poly (vinyl alcohol) (PPVA) and p-toluene sulfonic acid sodium (p-TSA) were simultaneously utilized as dopants to modify PPy and prepare water dispersible PPVA/p-TSA/PPy (PPVAT/PPy) solution. Additionally, poly (vinyl alcohol) (PVA) and TSA were also adopted to prepare PVA/p-TSA/PPy (PVAT/PPy) for comparison. Denser film with granular morphology was observed for PPVAT/PPy nanocomposite film. Compared with PVAT/PPy-40 %, the tensile strength of PPVAT-8.0 %/PPy-40 % increased from 248.8–283.9 MPa. PPVAT/PPy displayed higher compatibility and interactions with EP compared to PPy-TSA and PVAT/PPy. Compared with EP, the impedance modulus of PVAT/PPy+EP and PPVAT/PPy+EP increased from 3.17×105 to 1.07×108 and 1.62×109 Ω·cm2; corrosion current density Icorr decreased from 1.49×10−6 to 7.72×10-8 and 4.01×10-9 A·cm-2; corrosion potential Ecorr displayed a positive shift of 230 mV and 269 mV, respectively. The corrosion inhibition efficiency of PPVAT/PPy+EP reached 99.83 %, which is much higher than that of PVAT/PPy+EP (93.97 %). PPVAT/PPy+EP nanocomposite coating has been proved to have preferable long-term corrosion resistance based on electrochemical impedance spectra (EIS), polarization curves and salt water spray test. The simultaneous incorporation of phosphate anions, sulfate ions and PPy into EP was beneficial to fabricate high-performance anticorrosion coating.

中文翻译：

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水性环氧基质中的磷酸化聚合物/阴离子表面活性剂掺杂聚吡咯，以提高机械和耐化学性

摘要 聚吡咯 (PPy) 与水性环氧涂料 (EP) 之间的相容性仍然是主要挑战。在这里，磷酸化聚乙烯醇（PPVA）和对甲苯磺酸钠（p-TSA）同时用作掺杂剂来改性PPy并制备水分散性PPVA/p-TSA/PPy（PPVAT/PPy）溶液。此外，还采用聚乙烯醇 (PVA) 和 TSA 制备 PVA/p-TSA/PPy (PVAT/PPy) 以进行比较。对于 PPVAT/PPy 纳米复合膜，观察到具有颗粒形态的致密膜。与 PVAT/PPy-40 % 相比，PPVAT-8.0 %/PPy-40 % 的拉伸强度从 248.8-283.9 MPa 增加。与 PPy-TSA 和 PVAT/PPy 相比，PPVAT/PPy 显示出更高的兼容性和与 EP 的相互作用。与EP相比，PVAT/PPy+EP和PPVAT/PPy+EP的阻抗模量从3.17×105增加到1.07×108和1。62×109 Ω·cm2；腐蚀电流密度Icorr从1.49×10-6下降到7.72×10-8和4.01×10-9 A·cm-2；腐蚀电位 Ecorr 分别显示出 230 mV 和 269 mV 的正偏移。PPVAT/PPy+EP的缓蚀效率达到99.83%，远高于PVAT/PPy+EP的93.97%。基于电化学阻抗谱（EIS）、极化曲线和盐水喷雾试验，PPVAT/PPy+EP纳米复合涂层已被证明具有较好的长期耐腐蚀性能。将磷酸根阴离子、硫酸根离子和PPy同时掺入EP有利于制备高性能防腐涂层。PPVAT/PPy+EP的缓蚀效率达到99.83%，远高于PVAT/PPy+EP的93.97%。基于电化学阻抗谱（EIS）、极化曲线和盐水喷雾试验，PPVAT/PPy+EP纳米复合涂层已被证明具有较好的长期耐腐蚀性能。将磷酸根阴离子、硫酸根离子和PPy同时掺入EP有利于制备高性能防腐涂层。PPVAT/PPy+EP的缓蚀效率达到99.83%，远高于PVAT/PPy+EP的93.97%。基于电化学阻抗谱（EIS）、极化曲线和盐水喷雾试验，PPVAT/PPy+EP纳米复合涂层已被证明具有较好的长期耐腐蚀性能。将磷酸根阴离子、硫酸根离子和PPy同时掺入EP有利于制备高性能防腐涂层。