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首页> 外文期刊>Journal of Applied Polymer Science >POLYETHYLENE PLASMA FLUORINATION AND PERMEABILITY RELATIONSHIPS TO METHANOL-GASOLINE MIXTURES
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POLYETHYLENE PLASMA FLUORINATION AND PERMEABILITY RELATIONSHIPS TO METHANOL-GASOLINE MIXTURES

机译：聚乙烯等离子体的氟化和与甲醇-汽油混合物的渗透率关系

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In the case of cold plasma fluorination we analyzed effects of the main processing conditions (power, exposure time, nature of gas, and number of fluorinated faces) on gasoline permeability of polyethylenes. Optimization of processing conditions gave us a permeability reduction of 30% compared to untreated polyethylene. XPS analysis of fluorinated specimens before permeation experiments shows the PE to be highly fluorinated at the surface with a F/C ratio up to 2. Fluorination appeared to be homogeneous over the disk surface with a concentration depth profile showing a step decline below the extreme surface. However, significant fluorination is achieved only up to a few tens of nanometers (20 to 30). A more interesting effect is the evidence for chain breaking during the process suggests the creation of short chain segments at the surface. These segments would be highly fluorinated but easily leeched out by the diffusing molecules. Leeching seems more important with alcohol containing gasolines. These data show clearly that fluorination by cold plasmas in the conditions under studies has not a permanent effect. (C) 1996 John Wiley & Sons, Inc. [References: 45]
机译：在冷等离子体氟化的情况下，我们分析了主要加工条件（功率，暴露时间，气体性质和氟化面数）对聚乙烯汽油渗透性的影响。与未处理的聚乙烯相比，加工条件的优化使我们的渗透率降低了30％。渗透实验之前，对氟化样品的XPS分析表明，PE在表面上是高度氟化的，F / C比高达2。氟化物在磁盘表面上似乎是均匀的，浓度深度分布显示出在极限表面以下逐步下降。 。但是，只有几十纳米（20至30）才能实现明显的氟化。一个更有趣的效果是过程中断链的证据表明在表面形成了短链段。这些链段将被高度氟化，但容易被扩散分子浸出。对于含酒精的汽油，渗水似乎更为重要。这些数据清楚地表明，在研究条件下，冷等离子体的氟化作用不会产生永久性影响。 （C）1996 John Wiley＆Sons，Inc. [参考：45]

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