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首页> 外文期刊>RSC Advances >Effect of end-groups on simultaneous oleophobicity/hydrophilicity and anti-fogging performance of nanometer-thick perfluoropolyethers (PFPEs)
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Effect of end-groups on simultaneous oleophobicity/hydrophilicity and anti-fogging performance of nanometer-thick perfluoropolyethers (PFPEs)

机译：端基对纳米厚的全氟聚醚（PFPE）同时疏油性/亲水性和防雾性能的影响

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摘要

Simultaneously oleophobic/hydrophilic coatings are highly desirable in many important applications, e.g., anti-fogging. However, to date, such coatings have been rarely reported and the underlying mechanisms remain unclear. In the current paper, the wetting behavior of three nanometer-thick perfluoropolyether (PFPE) polymers with the same backbone but different end-groups has been studied by contact angle tests and the underlying mechanisms governing the simultaneous oleophobicity/hydrophilicity have been investigated. The experimental results indicated that the end-groups of the nanometer-thick PFPEs are critical to the simultaneous oleophobicity/hydrophilicity. PFPE polymers with different end-groups can interact with the substrate in very different ways, resulting in different packing orders and thus different inter-chain distances within the polymer nanofilms. If the inter-chain distance is appropriately small, smaller water molecules penetrate the nanofilms quickly while larger oil molecules penetrate the nanofilms much more slowly. As a result, the surface shows a higher oil contact angle (OCA) than WCA, i.e., simultaneous oleophobicity/hydrophilicity. Moreover, the effect of simultaneous oleophobicity/ hydrophilicity on the long-term anti-fogging capability has been studied by X-ray photoelectron spectroscopy (XPS) and anti-fogging tests. The results indicated that the unique simultaneous oleophobicity/hydrophilicity reduces the airborne hydrocarbon contamination and therefore improves the long-term anti-fogging performance.
机译：同时在许多重要的应用例如防雾中，非常需要疏油/亲水涂层。然而，迄今为止，这种涂层很少报道，其潜在机理尚不清楚。在目前的论文中，通过接触角测试研究了三种具有相同主链但端基不同的纳米级全氟聚醚（PFPE）聚合物的润湿行为，并研究了控制同时疏油/亲水性的潜在机理。实验结果表明，纳米级PFPE的端基对于同时疏油/亲水性至关重要。具有不同端基的PFPE聚合物可以以非常不同的方式与基材相互作用，从而导致不同的堆积顺序，从而在聚合物纳米膜内产生不同的链间距离。如果链间距离适当地小，则较小的水分子快速渗透纳米膜，而较大的油分子缓慢渗透纳米膜。结果，表面显示出比WCA更高的油接触角（OCA），即同时疏油性/亲水性。此外，已经通过X射线光电子能谱法（XPS）和防雾试验研究了同时疏油/亲水性对长期防雾能力的影响。结果表明，独特的同时疏油性/亲水性减少了空气传播的碳氢化合物污染，因此改善了长期的防雾性能。

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