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Electrochemical Impedance Spectroscopy on UV‐Aged Polyester Coatings: Possibilities and Limits of Modeling Water Diffusion
Physica Status Solidi (A) - Applications and Materials Science Pub Date : 2020-03-28 , DOI: 10.1002/pssa.201901038 Ernst Dietmar Schachinger 1, 2 , Bernhard Strauß 2 , Roland Braidt 2 , Achim Walter Hassel 1
Physica Status Solidi (A) - Applications and Materials Science Pub Date : 2020-03-28 , DOI: 10.1002/pssa.201901038 Ernst Dietmar Schachinger 1, 2 , Bernhard Strauß 2 , Roland Braidt 2 , Achim Walter Hassel 1
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The water uptake behavior of three different, white pigmented polyester topcoats after UV‐A testing is studied with electrochemical impedance spectroscopy. One topcoat is investigated more in detail to explore the influence of short testing times (<500 h). Diffusion coefficients derived from fitting the capacitance curves with a common equation containing a swelling factor show a dependence on the initial film thickness for UV‐aged and pristine coatings. It is suggested that diffusion coefficients should be calculated with the initial slope method to better compare the influence of testing on water uptake. Coatings with a thickness of 20 μm show sigmoidal capacitance transients, and in general, the diffusion coefficients decrease after UV‐A testing. This is attributed to a superficial layer, on top of the coating which is affected by photooxidation and which has a retarding effect for water uptake. The first 500 h of UV‐A testing seems to be most important for the amount of water taken up by the coating. After the entire experiment scanning electron microscopy (SEM) micrographs are made on cross‐sectional polished samples. SEM cannot reveal any changes in porosity after UV‐A testing. Thermomechanical analysis (TMA) does not show a significant change in glass transition temperature after UV‐A testing.
中文翻译：
UV老化聚酯涂层的电化学阻抗谱：模拟水扩散的可能性和局限性
通过电化学阻抗谱研究了三种不同的白色颜料聚酯面漆经过UV-A测试后的吸水行为。对一种面漆进行了更详细的研究，以探索短测试时间（<500小时）的影响。由电容曲线与包含溶胀系数的通用方程拟合得到的扩散系数表明，该涂层对UV老化和原始涂层的初始膜厚具有依赖性。建议使用初始斜率法计算扩散系数，以更好地比较测试对吸水率的影响。厚度为20μm的涂层表现出S形瞬态电容瞬变，通常，经过UV-A测试后，扩散系数降低。这归因于表面层，涂层顶部受光氧化作用，对水的吸收具有阻滞作用。UV-A测试的前500小时对于涂料吸收的水量似乎最重要。在整个实验之后，对横截面抛光的样品进行扫描电子显微镜（SEM）显微照片。SEM在UV-A测试后无法显示孔隙率的任何变化。经过UV-A测试后，热机械分析（TMA）并未显示出玻璃化转变温度有明显变化。SEM在UV-A测试后无法显示孔隙率的任何变化。经过UV-A测试后，热机械分析（TMA）并未显示出玻璃化转变温度有明显变化。SEM在UV-A测试后无法显示孔隙率的任何变化。经过UV-A测试后，热机械分析（TMA）并未显示出玻璃化转变温度有明显变化。
更新日期：2020-03-28
中文翻译：
UV老化聚酯涂层的电化学阻抗谱：模拟水扩散的可能性和局限性
通过电化学阻抗谱研究了三种不同的白色颜料聚酯面漆经过UV-A测试后的吸水行为。对一种面漆进行了更详细的研究，以探索短测试时间（<500小时）的影响。由电容曲线与包含溶胀系数的通用方程拟合得到的扩散系数表明，该涂层对UV老化和原始涂层的初始膜厚具有依赖性。建议使用初始斜率法计算扩散系数，以更好地比较测试对吸水率的影响。厚度为20μm的涂层表现出S形瞬态电容瞬变，通常，经过UV-A测试后，扩散系数降低。这归因于表面层，涂层顶部受光氧化作用，对水的吸收具有阻滞作用。UV-A测试的前500小时对于涂料吸收的水量似乎最重要。在整个实验之后，对横截面抛光的样品进行扫描电子显微镜（SEM）显微照片。SEM在UV-A测试后无法显示孔隙率的任何变化。经过UV-A测试后，热机械分析（TMA）并未显示出玻璃化转变温度有明显变化。SEM在UV-A测试后无法显示孔隙率的任何变化。经过UV-A测试后，热机械分析（TMA）并未显示出玻璃化转变温度有明显变化。SEM在UV-A测试后无法显示孔隙率的任何变化。经过UV-A测试后，热机械分析（TMA）并未显示出玻璃化转变温度有明显变化。
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