Surface modification of polyester by oxygen- and nitrogen-plasma treatment
Surface modification of polyester by oxygen- and nitrogen-plasma treatment
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DOI：
10.1002/sia.2923
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发表时间：
2008-11-01
影响因子：
1.7
通讯作者：
Mozetic, Miran
中科院分区：
文献类型：
--
作者：
Vesel, Alenka;Junkar, Ita;Mozetic, Miran
本文研究了等离子体对聚对苯二甲酸乙二酯(PET)聚合物的表面改性。在S 3岁至90岁之间用氮气和氧气等离子体处理不同时间段的样品。血浆由射频发生器产生。样品在辉光区处理，电子温度约4 eV，正离子密度约2×10(15)m(-3)，中性原子密度氧约4×10(21)m(-3)，氮约1×10(21)m(-3)。用原子力显微镜(AFM)观察了表面形貌的变化。通过水接触角测定了表面润湿性，用XPS分析了表面的化学成分。通过XPS和不同时间段的润湿性测量，考察了等离子体处理后聚合物表面官能团的稳定性。氧等离子体处理的样品表面形貌的变化比氮等离子体处理的样品要明显得多。3 S的水滴接触角从未经处理的75度下降到氧气的20度和氮等离子体处理的25度，随着处理时间的延长，两种等离子体的接触角都不断减小，在等离子体处理1min后，氮等离子体的接触角达到10度左右。然而，对于氧气等离子体，即使在等离子体处理一分钟后，接触角也不断减小，最终降至几度以下。我们发现，在氧气或氮气等离子体中，水的接触角分别随着O/C比或N/C比的增加而线性增加。等离子体处理后的表面在前3天的老化效果更明显，但之后表面的亲水性比较稳定。版权所有(C)2008 John Wiley&Sons，Ltd.
In this paper, we present a study on the surface modification of polyethyleneterephthalate (PET) polymer by plasma treatment. The samples were treated by nitrogen and oxygen plasma for different time periods between 3 and 90 s. The plasma was created by a radio frequency (RF) generator. The gas pressure was fixed at 75 Pa and the discharge power was set to 200 W. The samples were treated in the glow region, where the electrons temperature was about 4 eV, the positive ions density was about 2 x 10(15) m(-3), and the neutral atom density was about 4 x 10(21) m(-3) for oxygen and 1 x 10(21) m(-3) for nitrogen. The changes in surface morphology were observed by using atomic force microscopy (AFM). Surface wettability was determined by water contact angle measurements while the chemical composition of the surface was analyzed using XPS. The stability of functional groups on the polymer surface treated with plasma was monitored by XPS and wettability measurements in different time intervals. The oxygen-plasma-treated samples showed much more pronounced changes in the surface topography compared to those treated by nitrogen plasma. The contact angle of a water drop decreased from 75 degrees for the untreated sample to 20 degrees for oxygen and 25 degrees for nitrogen-plasma-treated samples for 3 s. It kept decreasing with treatment time for both plasmas and reached about 10 degrees for nitrogen plasma after 1 min of plasma treatment. For oxygen plasma, however, the contact angle kept decreasing even after a minute of plasma treatment and eventually fell below a few degrees. We found that the water contact angle increased linearly with the O/C ratio or N/C ratio in the case of oxygen or nitrogen plasma, respectively. Ageing effects of the plasma-treated surface were more pronounced in the first 3 days; however, the surface hydrophilicity was rather stable later. Copyright (C) 2008 John Wiley & Sons, Ltd.