中文摘要：

用中等气压空气中均匀介质阻挡放电（DBD）产生的低温等离子体对聚甲基丙烯酸甲酯（PMMA）和聚碳酸酯（PC）两种聚合物薄膜进行表面改性，研究了DBD等离子体处理对两种材料表面亲水性的影响。通过接触角测量和表面能测量以及全反射傅里叶变换红外光谱等手段研究了等离子体处理前后PMMA和PC的表面特性。测量了不同功率密度下材料表面水接触角和表面能随处理时间的变化规律以及处理后的材料在空气中放置时的退化效应，并对改性的机理进行分析。结果表明，两种聚合物薄膜经DBD等离子体处理后，接触角随处理时间的增加而降低，表面能随处理时间的增加而增加，两者均在一定处理时间达到饱和值；增大均匀DBD处理的功率密度，利用更少的处理时间就能得到同样的处理效果。处理后的材料在空气中放置时会出现退化效应，但即使放置14d后材料表面水接触角仍远低于处理前的值。

英文摘要：

The surfaces of polymethylmetacrylate （PMMA） and polycarbonate （PC） films were modified by homogeneous, dielectric barrier discharge （DBD） plasma at medium pressure air. The impacts of the surface modification conditions, including the power densities, modification time, and exposure time in air, on properties of the films were studied. The surface hydrophilicity of the two types of films, before and after the surface modifications, were evaluated via the contact angle measurement, surface energy evaluation and with attenuated total reflectance Fourier transform infraed spec- troscopy （ATR-FTIR）. The results show that the surface modification significantly affects the hydrophilieity of all the films. For example, as the modification time increases, the contact angle decreases, the surface energy increases, and the above two parameters saturate at a critical modification time; a combination of an increase power density and a much shorter modification time leads to the same results. Interesting finding is that though aging effect was observed, after 14 days of exposure to air, their water contact angles were still much smaller than those of the control samples.