RF-Ar等离子体处理PET薄膜的亲水性及表面结构

Hydrophilicity and Surface Structure of PET Films Modified by Radio Frequency Ar Plasma

在工作压力为20Pa,功率为60W的条件下,采用RF-Ar等离子体对聚对苯二甲酸乙二醇酯(PET)薄膜进行了不同时间的表面改性。采用静态接触角、傅里叶变换红外光谱、X射线光电子能谱、原子力显微镜对薄膜改性前后的亲水性和表面结构进行了分析。结果表明,在0～120s的处理时间内,随着处理时间的增加,接触角呈现逐渐减小的趋势;而处理时间为120～300s时,随着处理时间的增加,接触角的变化并不明显,其值在22°～23.5°之间;处理后的薄膜表面引入了C—N、N—C=O、C=O、C—O等极性官能团;薄膜表面出现了圆锥状或圆球状的突起,粗糙度发生了变化。

The surface of poly （ethylene terephthalate）（PET） films was modified using radio frequency Ar plasma under a working pressure of 20 Pa and a power of 60 W for different length of time. The changes of hydrophilicity and surface structure of the films before and after modification were analyzed with static contact angle measurement, Fourier transformed infrared spectroscopy, X-ray photoelectron spectroscopy, and atomic force microscopy. It showed that the contact angles were gradually decreased with increasing treatment time within 0-120 s, however, further treated for longer time caused no further changes and remained in the region between 22 ° and 23.5 °. Polar groups such as C--N, N--C ~ O, C - O, C--O were formed on the treated film surface. Meanwhile, the surface roughness was increased and appeared conical or globular protuberances.