Abstract Phosphorylated poly(vinyl alcohol) (PPVA) was demonstrated to be more effective to improve the dispersion stability of polyaniline (PANI). Phosphate groups also can improve corrosion resistance, but they may spatially interfere with graft reaction of PANI onto PPVA. Therefore, it is of great significance to explore the balance between phosphorylation degree, graft reaction and composite performance. Here, EPPVA-grafted-PANI (EPPVA-g-PANI) dispersions were prepared by chemical grafting polymerization of aniline on the epichlorohydrin modified PPVA (EPPVA) with different degree of phosphorylation (DP). It was found that DP has a considerable effect on microstructure, rheological behaviors, as well as the compatibility between EPPVA and PANI. Enhanced interactions and compatibility were demonstrated for EPPVA-g-PANI-8.00 %, resulting in the increase of tensile strength from 26.84 to 38.62 MPa. As-prepared EPPVA-g-PANI dispersions can be directly blended with waterborne alkyd resins (WAR) without complex post-process to fabricate high-performance WAR/EPPVA-g-PANI nanocomposites. Compared with WAR, the impedance modulus of WAR/EPPVA-g-PANI increased from 8.81×104 to 3.03×1010 Ω·cm2, corrosion current density decreased to 3.02×10−8 from 1.78×10−6 A·cm−2. Additionally, only one time constant was detected after 480 h immersion, further demonstrating excellent long-term corrosion resistance for WAR/EPPVA-g-PANI.

中文翻译：

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用于高性能水性生物基醇酸纳米复合材料的磷酸化聚乙烯醇接枝聚苯胺的合理设计

摘要 磷酸化聚乙烯醇（PPVA）被证明能更有效地提高聚苯胺（PANI）的分散稳定性。磷酸盐基团也可以提高耐腐蚀性，但它们可能会在空间上干扰 PANI 到 PPVA 上的接枝反应。因此，探索磷酸化程度、接枝反应和复合性能之间的平衡具有重要意义。在这里，EPPVA 接枝的聚苯胺 (EPPVA-g-聚苯胺) 分散体是通过苯胺在具有不同磷酸化度 (DP) 的环氧氯丙烷改性的 PPVA (EPPVA) 上进行化学接枝聚合制备的。结果表明，DP 对微观结构、流变行为以及 EPPVA 和 PANI 之间的相容性有相当大的影响。EPPVA-g-PANI-8.00 % 证明了增强的相互作用和兼容性，导致拉伸强度从 26.84 MPa 增加到 38.62 MPa。制备好的 EPPVA-g-PANI 分散体可以直接与水性醇酸树脂 (WAR) 混合，无需复杂的后处理，即可制备高性能 WAR/EPPVA-g-PANI 纳米复合材料。与WAR相比，WAR/EPPVA-g-PANI的阻抗模量从8.81×104增加到3.03×1010 Ω·cm2，腐蚀电流密度从1.78×10-6 A·cm-2降低到3.02×10-8。此外，浸泡 480 小时后仅检测到一个时间常数，进一步证明 WAR/EPPVA-g-PANI 具有出色的长期耐腐蚀性。WAR/EPPVA-g-PANI的阻抗模量从8.81×104增加到3.03×1010 Ω·cm2，腐蚀电流密度从1.78×10-6 A·cm-2降低到3.02×10-8。此外，浸泡 480 小时后仅检测到一个时间常数，进一步证明 WAR/EPPVA-g-PANI 具有出色的长期耐腐蚀性。WAR/EPPVA-g-PANI的阻抗模量从8.81×104增加到3.03×1010 Ω·cm2，腐蚀电流密度从1.78×10-6 A·cm-2降低到3.02×10-8。此外，浸泡 480 小时后仅检测到一个时间常数，进一步证明 WAR/EPPVA-g-PANI 具有出色的长期耐腐蚀性。