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基于聚合物膜修饰的等离子体远程与动态特性研究
发表时间：2012-04-15 浏览量：1691 下载量：713
| 全部作者： | 赵之平，李宁，李梅生，张悦，刘文芳 |
| 作者单位： | 北京理工大学化工与环境学院 |
| 摘 要： | 研究低温等离子体的远程与动态特性，考察等离子体辉光距离随等离子体操作条件的变化关系，通过聚四氟乙烯（PTFE）膜刻蚀率及膜表面形貌的电场发射扫描电子显微镜(field emission scanning electron microscopy, FESEM）分析，研究离子体远程距离对膜刻蚀的影响。以聚丙烯(PP)纤维膜为研究对象，采用1,1-二苯基-2-苦基苯肼（DPPH）法测定过氧自由基密度，较系统地考察Ar远程动态等离子体处理条件对膜表面过氧自由基密度的影响。结果表明：在远程距离不小于20 cm时，能够很大程度上避免对膜表面的刻蚀作用。PP纤维膜在距放电中心一定距离处，静、动态等离子体均对膜具有活化作用，与静态等离子体相比，动态等离子体在膜表面产生的过氧自由基密度较高，辉光距离较远，且动态等离子体可穿越膜孔，透过部分仍具有一定活性。 |
| 关 键 词： | 膜分离；等离子体；远程与动态特性；过氧自由基；辉光距离 |
| Title： | Study on long-distance and dynamic characteristics of plasma based on polymer membranes |
| Author： | ZHAO Zhiping, LI Ning, LI Meisheng, ZHANG Yue, LIU Wenfang |
| Organization： | School of Chemical Engineering and Environment, Beijing Institute of Technology |
| Abstract： | In the present investigation, the long-distance and dynamic characteristics of plasma were explored. The glow distance of low-temperature plasma as a function of plasma parameters was discussed. Field emission scanning electron microscopy (FESEM) and accurate weight loss were used to characterize the etching effect occurred on the plasma treated polytetrafluoroethylene (PTFE) membranes. The peroxide radicals on the plasma irradiated polypropylene (PP) fibril membrane were detected by 1,1-Diphenyl-2-picrylhydrazyl (DPPH) method after the sample exposed to air for few mintunes. The effect of plasma parameters on the content of peroxide radicals was investigated. Results show that the membrane samples set in their proper places, where are more than about 20 cm far away from the discharge center in this study range, could be able to avoid the etching and degradation of membrane bulk greatly. The peroxides also can be detected on the membrane irradiated even at a long distance of 40 cm downstream from the center of the inductor coil. Not only that, more peroxides and a longer glow distance can be obtained by long-distance and dynamic plasma flow treatment. The dynamic plasma flow can be led through membrane pores. And the penetrated active species carried by flowing plasma can penetrate the first layer of the PP fibril membrane, but even treat the second membrane layer. |
| Key words： | membrane separation; plasma; long-distance and dynamic characteristics; peroxide radicals; glow distance |
| 发表期数： | 2012年4月第7期 |
| 引用格式： | 赵之平，李宁，李梅生，等. 基于聚合物膜修饰的等离子体远程与动态特性研究[J]. 中国科技论文在线精品论文，2012，5（7）：677-682. |
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