常壓電漿介電質放電在放電區域出口處進行高分子材料表面改質特性的研究

Abstract

利用電漿進行表面改質已經越來越受歡迎了，因為和傳統的化學過程比較起來有更多的優點。例如對環境傷害較低，處理時間快速以及可以應用在更多的技術上。本實驗是使用氮氣以及氧氣在大氣電漿下進行聚丙烯表面改質的處理。此裝置放電區域是由兩塊外面包覆石英版的金屬平板所產生，其中將高分子材料放在電漿出口的位置加以處理。處理前後使用接觸角量測系統量測接觸角以界定親疏水性特性。本實驗利用氮氣加氧氣電漿對聚丙烯進行表面改質的效果顯著，在改變不同電漿處理的垂直距離能將原先接觸角103度降低至26度，其中最佳化的處理位置大概在6mm的地方。但經過長時間放置於大氣後，接觸角會有少部分的回升，但回升後的角度仍然低於原本的角度。之後還透過AFM分析來觀察聚丙烯表面粗操度的改變。除此之外，本實驗還利用XPS來分析聚丙烯表面經過電漿處理前後表面所含元素以及相對百分比。經過分析得到表面會產生許多急性的官能基，例如CO, C=O, 以及COO。由本實驗對親水性改質以及表面結構進行的探討可知電漿處理是有效率的。

Plasma treatment of polymers is gaining more and more popularity as a surface modification technique, since it offers numerous advantages over the conventional chemical processes. Plasma surface treatment is an environmentally benign, fast and versatile technology. Modification of the surface properties of polypropylene (PP) films is studied using oxygen and nitrogen dielectric barrier discharge at atmospheric pressure. The discharge was generated between two planar metal electrodes, with the both electrodes covered by quartz and the polymer sample was placed post-discharge region. The surface properties of both treated and untreated polymers were characterized by contact angle measurement. With the change treating distance for N2+O2 plasma, the water contact angle changes from 103o before treatment to a minimum of 26o when Z is 6mm. After long-term aging time in ambient air, the much lowered surface contact angle of processed PP film is found to in part recover but still lower than the untreated material. Through AFM analysis, we also observed the change of surface morphology and roughness before and after plasma treatment. In addition, the effects of plasma treatment on the surface chemical characteristics of the PP films were observed by using X-ray photoelectron spectroscopy (XPS). As the result of analysis, we observed that polar functional groups, such as –CO, –C=O, and –COO were introduced on the PP film surface after atmospheric pressure plasma treatment. The results show that such a plasma treatment is effective.