低温等离子处理对PTFE表面性能的影响

Effect on PTFE Surface Property Treated by Low Temperature Plasma

采用He,O2为处理介质,对PTFE(聚四氟乙烯)薄膜进行了低温等离子体表面改性。分析了表面元素,测试了接触角和表面能,用原子力显微镜观察了PTFE表面形貌。研究表明:经等离子体表面处理后,PTFE接触角降低,表面能提高;经He处理后,水接触角由108°最低下降至82.4°,表面能由24.0mJ/m2到34.4mJ/m2;经O2处理,水接触角由108°下降到了80.6°,表面能为35.8mJ.m2。形貌观察表明,处理后的PTFE表面粗糙度明显增加,引入了含氧官能团。另外,得到较佳的处理参数:O2为处理介质、功率300 W。

PTFE films were treated by low temperature plasma,the treatment media was He or O2. The contact angle and the surface energy were investigated by the contact angle instrument and the morphology of PTFE is measured by atom force microscope （AFM） and environmental scanning electron microscope （ESEM）. It was confirmed that the contact angle of PTFE decreased and its surface energy increased after it was treated, their water contact angles were from 108° to 80.6° and the surface energy from 24.0 mJ/m^2 to 34.4 mJ/m^2 after treated by gas He; and the water contact angle were from 108° to 82.4°, the surface energy was from 24. 0 mJ/m^2 to 35.8 mJ/m^2 after treated by O2. It was showed that PTFE surface become more rough and some oxygen-containing active groups were formed after they were treated. In addition, O2 as the treatment media and power is 300 W, modification effect is more better.