利用丙烯酸電漿聚合法對雙軸延伸PTFE表面改質之研究

The Study of Surface Modification of Bi-axially Expanded PTFE by Acrylic Acid Plasma Polymerization

曾勝群(Sheng-Chun Tseng)

指導教授 ： 陳玉惠

中原大學/理學院/化學研究所/碩士(2002年)

https://doi.org/10.6840/cycu200200236

摘要

摘要
本論文所使用之ePTFE (expanded Polytetrafluoroethylene )為一PTFE經過雙軸延伸後的產品，其一般性質與PTFE類似，具有耐化學品、耐熱、低介電特性及低摩擦係數等優點。雖然ePTFE的應用也相當普及，但與PTFE相同其疏水性的特性卻也往往導致它的應用受到許多限制。所以，若能提高ePTFE的表面親水性，則其應用將會更廣。
本論文利用不同的低溫電漿表面改質法對ePTFE進行表面改質，以接枝或直接聚合丙烯酸的方式增加ePTFE的表面親水性。其方式分別是乙烯微波電漿誘導熱接枝丙烯酸反應、丙烯酸微波電漿聚合反應，丙烯酸高週波電漿聚合反應及AAc/C2H4混合高週波電漿聚合反應等四種。改質後的試片以ESCA、ATR-FTIR、SEM、AFM和dynamic contact angle-Wilhelmy plate method等表面分析技術評估改質成果，並探討不同方式對改質效果之差異。由表面分析之[F]/[C]與[O]/[C] 值結果顯示得知，四種方法中丙烯酸高週波電漿聚合反應法效果最好且步驟簡單，表面保有較多影響親水性之[COOH]官能基；在功率為2～30W中，相同的單體流量和處理時間下，較高功率會有較佳之成膜效果，此法可將ePTFE之表面改質為丙烯酸高分子膜，且其動態接觸角之前進角由158°減小至63°左右，靜態接觸角則由127.7°下降至28.0，有很好之親水性改善。

關鍵字

表面分析 ； 動態接觸角 ； 丙烯酸 ； PTFE ； 電漿 ； 電漿表面改質

並列摘要

Abstract
Since the expanded polytetrafluoroethylene (ePTFE) essentially a polytetrafluoroethylene (PTFE) material, it possesses the PTFE properties such as low electric constant, thermal stability, chemical inertness and low surface energy. It has been widely used for separator in tightly pressed and varied chemical environment. Nevertheless, the hydrophobic characteristic has restricted these materials for certain applications. Thus, to enhance its value, it is important to improve the hydrophobic properties of its surface.
In this study, different methods were carried out to modify the surface properties of the ePTFE sample, which included C2H4 microwave plasma pretreatment and followed by acrylic acid graft polymerization、microwave plasma polymerized acrylic acid、radio frequency plasma polymerized acrylic acid and C2H4/AAc radio frequency copolymerization. The modified specimens were characterized with electron spectroscopy for chemical analysis (ESCA)、attenuated total reflection fourieer transform infrared spectroscopy (ATR-FTIR)、scanning electron spectroscopy (SEM)、atomic force microscopy (AFM) and contact angle by Wilhelmy plate method. According to the ESCA C1s core level spectra, it is found that with the radio frequency acrylic acid plasma polymerization a desirable [F]/[C] and [O]/[C] ratio on the surface, and a higher level of functional group retention ([COOH/R]) of the acrylic acid were obtained. The result of AFM measurement show that under. the same monomer flow rate and deposition time higher plasma power result in a higher efficiency of the film deposition, and less roughness of the ePTFE surface. The result of the dynamic contact angle measurement shows that the radio frequency acrylic acid plasma polymerization is a more efficient method to make the surface of the ePTFE hydrophilic than the other method need in this study.

並列關鍵字

AFM ； PTFE ； ESCA ； dynamic contact angle ； Acrylic acid ； Surface analysis ； Plasma ； Plasma Surface Modification

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