磁场对聚酯圆筒内表面C_2H_2等离子体处理的影响研究

Influence of Magnetic Field on Inner Wall Surface of Polythylene Terephthalate Tubes Modified with C_2H_2 Plasma

研究了不同磁场约束条件下C2H2射频放电对PET圆筒内表面性能的影响规律。利用傅里叶变换红外光谱(FTIR)对不同等离子体条件下处理的聚酯样品表面进行了分析。并且通过接触角测试仪对沿聚酯圆筒轴线方向上不同区域的含氢碳薄膜表面的润湿行为进行了分析。结果表明,有外部磁场约束时乙炔等离子体处理后样品表面膜层中氢含量较高,且碳原子主要以sp3组态互相键合。反应气压较高时,改性后的表面润湿性分布均匀。在反应气压较低时,改性后内表面的润湿性在轴向方向上分布不均匀,磁场的加入可以有效提高表面处理的均匀性。同时外部磁场的引入也增加了改性后膜层性能的稳定性。

The inner walls of the polythylene terephthalate （PET） tubes were modified with RF C2H2 plasma. The microstructures and properties of the amorphous hydrogenated carbon （a-C：H） films, deposited under different conditions on the inner walls by rf plasma enhanced chemical vapor deposition （PECVD）, were characterized with Fourier transform infrared spectroscopy （FTIR） and contact angle measurement with sessile technique. The results show that the surface modification with C2H2 plasma considerably affects its stoiehiometries and its properties. For instance, the external magnet- ic fields result in a high H content and sp^3 bonded carbon atoms. And higher pressure leads to more uniform surface-wettability; in contrast, low pressure is responsible for the non-uniform axial distribution of wettability. We suggest that the extemal field significantly may improve the uniformity of surface properties and the long term stability of the surface-modi-fied PET inner walls.