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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis, Characterization, and Electropolymerization of Mannich Bases: Influence of Substituents on Protective Ability of Organic Coatings
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Synthesis, Characterization, and Electropolymerization of Mannich Bases: Influence of Substituents on Protective Ability of Organic Coatings

机译：曼尼希碱的合成，表征和电聚合：取代基对有机涂料保护能力的影响

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Aminoalkyl phenol derivatives were prepared and tested for electrooxidaation in alkaline hydroalcoholic electrolytes. We estimated the relative insulating character of thin (<0.3 μm) organic coatings on several metal electrodes (Fe, Cu, and Ni), through both voltammetric and potentiostatic runs. Unsaturated allyl and but-3-enyl groups confer the most effective passivation phenomenon, while N-methyl-substituted Mannich bases do not provide the good protective properties expected. This result was explained through the relative easiness of the nitrogen oxidation of these monomers, leading to parasite reactions (methoxylation of the growing polymer chains) and additional termination reactions, thereby limiting the molecular weight of the polymer. FTIRAS results showed that prducts of the anodic oxidative coupling process consist (especially for the nature of monomer) of a poly(oxy-1,4-phenylene)-type stucture. Amino and unsaturated substituted groups remain unchanged during electropolymerization, making the resulting coatings attractive to use as reactive primer layers. The thickness of the coatings was found to reach 2-5 μm in free-water solutions. This behavior, particular to Mannich bases, was explained by the hydrophilic character of the growing polymer chains due to the presence of amino groups.
机译：制备了氨基烷基苯酚衍生物，并测试了其在碱性水醇电解质中的电氧化作用。我们通过伏安和恒电位运行估算了几个金属电极（Fe，Cu和Ni）上有机薄膜（<0.3μm）的相对绝缘特性。不饱和的烯丙基和3-丁基具有最有效的钝化现象，而N-甲基取代的曼尼希碱则不能提供预期的良好保护性能。通过这些单体的氮氧化的相对容易性来解释该结果，这导致寄生虫反应（生长的聚合物链进行甲氧基化）和其他终止反应，从而限制了聚合物的分子量。 FTIRAS结果表明，阳极氧化偶联过程的产物由聚（氧-1，4-亚苯基）型结构组成（特别是对于单体的性质而言）。氨基和不饱和取代基在电聚合过程中保持不变，从而使所得涂层具有吸引力，可用作反应性底漆层。发现在自由水溶液中涂层的厚度达到2-5μm。由于存在氨基，正在增长的聚合物链的亲水特性解释了这种行为，特别是曼尼希碱的行为。

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