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Self-Cleaning Photocatalytic Polyurethane Coatings Containing Modified C60 Fullerene Additives

机译：包含改性C60富勒烯添加剂的自清洁光催化聚氨酯涂料

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摘要

Surfaces are often coated with paint for improved aesthetics and protection; however, additional functionalities that impart continuous self-decontaminating and self-cleaning properties would be extremely advantageous. In this report, photochemical additives based on C60 fullerene were incorporated into polyurethane coatings to investigate their coating compatibility and ability to impart chemical decontaminating capability to the coating surface. C60 exhibits unique photophysical properties, including the capability to generate singlet oxygen upon exposure to visible light; however, C60 fullerene exhibits poor solubility in solvents commonly employed in coating applications. A modified C60 containing a hydrophilic moiety was synthesized to improve polyurethane compatibility and facilitate segregation to the polymer–air interface. Bulk properties of the polyurethane films were analyzed to investigate additive–coating compatibility. Coatings containing photoactive additives were subjected to self-decontamination challenges against representative chemical contaminants and the effects of additive loading concentration, light exposure, and time on chemical decontamination are reported. Covalent attachment of an ethylene glycol tail to C60 improved its solubility and dispersion in a hydrophobic polyurethane matrix. Decomposition products resulting from oxidation were observed in addition to a direct correlation between additive loading concentration and decomposition of surface-residing contaminants. The degradation pathways deduced from contaminant challenge byproduct analyses are detailed.
机译：表面通常涂有油漆，以提高美观性和保护性。然而，赋予连续的自我净化和自我清洁特性的附加功能将是极其有利的。在此报告中，将基于C60富勒烯的光化学添加剂掺入聚氨酯涂料中，以研究其涂料相容性和赋予涂料表面化学去污能力的能力。 C60具有独特的光物理特性，包括在可见光下产生单线态氧的能力;但是，C60富勒烯在涂料应用中通常使用的溶剂中显示出较差的溶解性。合成了含有亲水部分的改性C60，以改善聚氨酯的相容性并促进与聚合物-空气界面的分离。分析了聚氨酯薄膜的整体性能，以研究添加剂与涂料的相容性。含有光敏添加剂的涂料受到代表性化学污染物的自我净化挑战，并报告了添加剂负载浓度，曝光量和时间对化学净化的影响。乙二醇尾巴与C60的共价连接改善了其在疏水性聚氨酯基质中的溶解度和分散性。除了添加剂负载浓度和表面污染物分解之间的直接关系外，还观察到了由氧化引起的分解产物。详细介绍了从污染物挑战副产物分析得出的降解途径。

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