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根据2.3节所给出的Owens二液法，通过测量得到的PET薄膜表面的去离子水和乙二醇的接触角，计算得到了4组功率密度下PET表面能随处理时间变化曲线， 如图4所示。从图中可以看出，与水接触角变化规律相反，当功率密度固定时候，材料的表面能先是随处理时间增加而增加，当处理时间达到一定值时，表面能达到饱和状态。功率密度为30.83W/cm2时，PET的表面能从处理前的31.302mJ/m2提高到77.098mJ/m2。 从图中还可以看出，处理时间相同时，大功率密度均匀DBD处理使PP表面能上升得更多。PP在4组功率密度下处理时间为2s时，表面能分别从处理前的31.302mJ/m2提高到40.861mJ/m2、45.239mJ/m2、54.419mJ/m2和67.59/m2。PET薄膜表面能在4组功率密度下到达饱和状态的处理时间分别为15s、10s、8s和5s，说明增大功率密度，利用更少的处理时间就能得到同样的处理效果。 因此，在DBD等离子体实际工业应用中，可以通过增大DBD处理的功率密度，从而利用更少的处理时间就能得到同样的处理效果。 |
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toflyfirst
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yhison0614(金币+5,VIP+0): 10-29 14:14
yhison0614(金币+5,VIP+0): 10-29 14:14
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According to Section 2.3 given by Owens two liquid method, obtained by measuring the surface of PET film de-ionized water and ethylene glycol contact angle, calculated power density of the four groups under the surface energy of PET with the processing time curve, As shown in Figure 4. From the figure we can see that variation of contact angle with water contrast, when the power density of a fixed time, the material surface energy first increases with the processing time, when the processing time reaches a certain value, the surface can reach saturation. 30.83W/cm2 when the power density, PET surface from treatment before the 31.302mJ/m2 to 77.098mJ/m2. From the figure can also be seen with the same processing time, high power density, uniform DBD processing makes the surface energy of PP increased even more. PP power density in the four groups under the processing time is 2s, the surface can be handled separately from the pre-31.302mJ/m2 to 40.861mJ/m2, 45.239mJ/m2, 54.419mJ/m2 and 67.59/m2. PET film surface power density in four groups to reach saturation under the processing time were 15s, 10s, 8s and 5s, shows increased power density, using less processing time will be able to get the same treatment effect. Thus, in DBD plasma practical industrial applications, it can be handled by increasing DBD power density, thus using less processing time will be able to get the same treatment effect. |
2楼2009-10-25 18:19:34
够长啊，终于翻完了……供参考 ,Just as follows
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yhison0614(金币+25,VIP+0): 10-29 14:14
yhison0614(金币+25,VIP+0): 10-29 14:14
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According to Owens two liquid method given by Section 2.3 , the curve of the surface energy of PET with processing time under the 4 groups of power density was obtained by measuring the contact angle between de-ionized water and ethylene glycol on the surface of PET membrane and calculating . As shown in Figure 4. From the figure we can see that on the contrary to the variation of water contact angle, the surface energy of the material first increases with the processing time and then reaches saturation when the processing time reaches a certain value when the power density is fixed. When the power density is 30.83W/cm2 , the surface energy of PET increases to 77.098mJ/m2 from 31.302mJ/m2 before treatment. From the figure we can also see that Uniform DBD processing with high power density is enable to increase the surface energy of PP more. the surface energy of PP increases from 31.302mJ/m2 before treatment to 40.861mJ/m2、45.239mJ/m2、54.419mJ/m2 and 67.59/m2 respectively of the 4 groups of power densities when the processing time is 2s and the processing time necessary for the surface energy of PET to reach saturation of the 4 groups is 15s、10s、8s and 5s respectively, which indicates that less processing time is needed to reach the same effect by increasing the power density . Thus, in the DBD plasma practical industrial applications, increasing the power density of DBD processing can help to reach the same effect with less processing time. |
3楼2009-10-26 13:47:45