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首页> 美国政府科技报告 >Hydrophobic and Oleophobic Fluoropolymer Coatings of Extremely Low Surface Energy Properties and Applications
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Hydrophobic and Oleophobic Fluoropolymer Coatings of Extremely Low Surface Energy Properties and Applications

机译：疏水性和疏油性含氟聚合物涂层具有极低的表面能特性和应用

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A comparison of the critical surface tension of wetting of new but commercially available polymeric solids has revealed that a group of polyfluoroesters had the lowest values of of any plastics or other solids yet reported. In order to assess their possible utility in certain new potential naval applications, experimental studies were made on the effect of (a) high humidity and (b) immersion in organic liquids on thin coatings of the two fluorinated polyesters. No changes in coating adhesion to the underlying resin or metal surfaces were found after such exposures, nor were the wet ability or other physical properties of the coatings significantly affected. Prevention of spreading by fine instrument oils on surfaces of substances such as stainless steel, sapphire, and Pyrex glass was also investigated by applying the coatings as barriers in the form of narrow circular bands, placing the spreading-oil drops in the uncoated center, and exposing the specimens to the atmosphere at ambient temperatures or cycles between +50° and -20°C. The results show that these polymer coatings will have future usefulness in several new types of applications among which are (a) prevention of liquid penetration in electrical, electronic, and mechanical equipment;(b) parting agents or adhesives for mold release applications;(c) barriers to prevent oil spreading in fine instruments;and (d) reduction of surface electrical leakage.

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