中文摘要：

在40kHz脉冲介质阻挡放电（DBD）产生等离子体，以丙烯酸为单体，在2000Pa的高气压下，聚合带羧基的功能薄膜。采用接触角测试仪（WCA）、傅里叶红外光谱仪（FTIR）、X光电子能谱（XPS）研究了占空比对沉积薄膜化学结构、表面性能的影响。实验得到，中频脉冲DBD放电在高气压下制备的薄膜官能团含量较高；结果同时表明薄膜的性能受脉冲放电占空比的影响较大，占空比越小，薄膜的化学结构与单体更相近，官能团密度越多，但薄膜的稳定性较差。

英文摘要：

Functional films of polymerized acrylic acid were coated by mid frequency, high pressure, dielectric barrier plasma deposition （DBD） with acrylic acid as the precursors. High density functional groups were obtained in the films. Its microstructures and optical properties were characterized with water contact angle（ W CA） evaluation, Fourier transform infrared spectroscopy（FHR）, and X-ray photoelectron spectroscopy（XPS）. The results show that the duty cycle of the pulsed plasma significantly affects the properties of the films. For instance, as the duty cycle decreases, the densities of the functional groups increase, and the chemical structure of the polymerized films grown at a high pressure increasingly resembles that of the monomer. Moreover, the ratenfion of functional groups on the surface increases but its stability deteriorates.