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首页> 外文期刊>International Journal of Electrochemical Science >Effect of the NCO/OH Molar Ratio on the Physical Aging and on the Electrochemical Behavior of Polyurethane-Urea Hybrid Coatings
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Effect of the NCO/OH Molar Ratio on the Physical Aging and on the Electrochemical Behavior of Polyurethane-Urea Hybrid Coatings

机译：NCO / OH摩尔比对聚氨酯-尿素杂化涂层的物理老化和电化学行为的影响

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摘要

Low volatile organic compounds (VOCs) coatings are increasingly attractive due to bothenvironmental concerns and high protective performance. High solid systems play a central role in thisscenario. In this work, 100% solids polyurethane-urea hybrid coatings have been prepared. Thecoatings were prepared using methylene diphenyl diisocyanate (MDI) for the synthesis process anddifferent NCO/OH molar ratio. The effects of the structural characteristics on the physical agingbehavior and on the electrochemical response of the hybrid coatings were evaluated using differentialscanning calorimetry (DSC) and electrochemical impedance spectroscopy (EIS). The results showedthat the coating with the highest NCO/OH ratio presented the best combination of properties, showinglow susceptibility to physical aging and high corrosion resistance.
机译：由于对环境的关注和较高的防护性能，低挥发性有机化合物（VOC）涂料越来越有吸引力。高固体含量系统在这种情况下起着核心作用。在这项工作中，已经制备了100％固体含量的聚氨酯-脲杂化涂料。使用亚甲基二苯基二异氰酸酯（MDI）制备涂料，以用于合成过程和不同的NCO / OH摩尔比。使用差示扫描量热法（DSC）和电化学阻抗谱（EIS）评估了结构特性对混合涂层的物理老化行为和电化学响应的影响。结果表明，具有最高NCO / OH比的涂层表现出最佳的性能组合，表现出较低的物理老化敏感性和较高的耐腐蚀性。

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