Photo Initiated Chemical Vapour Deposition To Increase Polymer Hydrophobicity.
Photo Initiated Chemical Vapour Deposition To Increase Polymer Hydrophobicity.
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DOI：
10.1038/srep31574
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发表时间：
2016-08-17
影响因子：
4.6
通讯作者：
Tavares JR
中科院分区：
文献类型：
--
作者：
Bérard A;Patience GS;Chouinard G;Tavares JR
苹果种植者面临着生产有机苹果的新挑战，现在许多人用高密度聚乙烯（HDPE）网覆盖果园以防止昆虫，而不是喷洒杀虫剂。然而，与雨水相关的潮湿有利于苹果黑星病的发展，黑星病在叶子和果实上积累，造成难看的斑点。用超疏水涂层处理网应该减少通过网的水量。在这里，我们使用光引发化学气相沉积（PICVD）处理HDPE和聚对苯二甲酸乙二醇酯。我们将聚合物样品放置在石英管中，并使H2和CO的混合物通过，同时UVC灯（254 nm）照射表面。处理后，水滴与表面之间的接触角平均增加了20°。在离管入口70 cm处放置的样品的接触角大于在45 cm和20 cm处放置的样品的接触角。PICVD处理的HDPE实现了124°的接触角。用溶剂基商业产品喷涂的网实现了180°，但令人惊讶的是，水的进入高于具有较低接触角的网。
Apple growers face new challenges to produce organic apples and now many cover orchards with high-density polyethylene (HDPE) nets to exclude insects, rather than spraying insecticides. However, rainwater- associated wetness favours the development of apple scabs, Venturia inaequalis, whose lesions accumulate on the leaves and fruit causing unsightly spots. Treating the nets with a superhydrophobic coating should reduce the amount of water that passes through the net. Here we treat HDPE and polyethylene terephthalate using photo-initiated chemical vapour deposition (PICVD). We placed polymer samples in a quartz tube and passed a mixture of H2 and CO through it while a UVC lamp (254 nm) illuminated the surface. After the treatment, the contact angle between water droplets and the surface increased by an average of 20°. The contact angle of samples placed 70 cm from the entrance of the tube was higher than those at 45 cm and 20 cm. The PICVD-treated HDPE achieved a contact angle of 124°. Nets spray coated with a solvent-based commercial product achieved 180° but water ingress was, surprisingly, higher than that for nets with a lower contact angle.