氧等离子体注入对PET亲水性及抗菌性能影响

Surface wettability and antibacterial effect of PET film treated with oxygen plasma ion implantation

利用氧等离子体浸没离子注入技术对聚合物材料(PET)进行表面改性后接枝有机抗菌剂赋予PET薄膜抗菌性能.试验结果表明:PET薄膜表面接枝上的抗菌剂在改性表面呈针状分布.经氧等离子体处理后的PET薄膜表面水接触角从78°降低到33°.红外光谱显示PET薄膜表面的分子结构被破坏,苯环的对位氢发生取代反应,分子链中形成了C-O亲水基团.氧等离子体的注入时间和注入电压均对抗菌持久性有重要的影响,较高的注入电压能够使PET薄膜表面获得较深的改性层,利于改性表面亲水性的保持.注入时间超过10min,电压超过-10kV的样品在空气中放置40天后的抗菌率仍能达到90%以上.

Poly（ethyleneterephthalate） （PET） film was treated by oxygen plasma immersion ion implantation （O2-PⅡI）,then grafted with triclosan to achieve the antibacterial surface properties. The treated surface was characterized by SEM,FTIR,and contact angle measurements. The antibacterial properties were evaluated utilizing the method of plate-counting of Escherichia coli （Gram negative）. Results indicate that the surface of O2-PⅡI PET is more hydrophilic,and the modified film is grafted firmly with the antibacterial reagents. The changes in the surface hydrophicity may be attributed to that a large amount of oxygen is incorporated onto the surface,and C-C and C-H groups are changed into C-O groups by oxygen plasma immersion ion implantation. The plasma implantation time and bias voltage have critical influences on the perdurability of antibacterial efficacy. Higher implantation voltage leads to deeper modified layer of PET film,which is beneficial for long-term wettability of the modified surface of PET film. The antibacterial effect of the samples treated by -10 kV for more than 10 min still maintains above 90% after aging for 40 days in the air.