以氨氣及乙炔/氨氣電漿改質法提昇聚四氟乙烯膜面親水性之研究

Surface Modification of PTFE Membranes Using Ammonia and Ammonia/Acetylene Plasma

王潔瑩(Chieh-Ying Wang)

指導教授 ： 魏大欽

中原大學/工學院/化學工程研究所/碩士(2004年)

https://doi.org/10.6840/cycu200400560

摘要

本研究以聚四氟乙烯（Polytetrafluoroethylene，PTFE）為基材，利用NH3及C2H2/NH3電漿進行表面改質，探討電漿功率、腔體壓力及進料氣體流量配比對膜材親水性及表面能的影響，並利用SEM及ESCA分析電漿改質後膜材之物理型態及化學組成變化。此外亦對電漿改質效能的老化效應做探討。
實驗結果發現在高電漿功率時由於電子密度高，更多物種被解離，因而有較好改質效果；腔體壓力方面，純氨氣電漿在低壓下由於電子有較高能量，產生更多離子及自由基有助於打斷C-F鍵結，因而有較佳親水性，但乙炔導入後可能由於離子轟擊效應不若成膜性自由基顯著，因此即使電子產生離子及自由基能力的不同，腔體壓力的改變對PTFE親水性提昇的影響不大。
使用純氨氣電漿改質PTFE雖能打斷CF2鍵結並導入部分親水官能基，但導入量有限且並不隨電漿功率上升而增加；而適量乙炔的導入除了打斷原有CF2鍵之外，更由於C-C交聯作用使得更多親水官能基固定於基材之上，是以親水性有更明顯提昇。
改質效能方面，不論是純氨氣或是乙炔/氨氣電漿改質都出現隨存放時間增加而衰退的情形，但儲存一週後大約達穩定值且不會回復至改質前的接觸角，顯示電漿改質的確可將PTFE的親水性提高，且電漿功率越大膜材保有的親水官能基越多。而比較乙炔/氨氣不同進料配比之改質效能變化，發現適度的交聯作用較有助於膜材親水性的保留。

關鍵字

聚四氟乙烯 ； 接觸角 ； 電漿表面改質 ； 氨氣

並列摘要

Both diasheet and expanded olytetrafluoroethylene membranes were treated with NH3 and C2H2/NH3 plasma to enhance its wettability. The effects of plasma treatment were evaluated by means of contact angle measurement, scanning electron microscopy and electron spectroscopy for chemical analysis. And the aging effect of plasma-modified PTFE is also investigated.
The first part of this study is pure NH3 plasma treatment. It leads to defluoroination and creation of C-C and C-H bonding but also the introduction of nitrogen-containing groups. The wettability of NH3 plasma-modified PTFE was more improved under low chamber pressure or high power conditions because of enough ion bombardment and radical concentration. However with the increasing storage time, the wettability of the NH3 plasma-modified PTFE is partially lost, it would get constant after one week.
In the second part of the study, the effects of operating parameters on C2H2/NH3 plasma-modified PTFE were investigated. It was found that the C2H2/NH3 plasma-modified PTFE is more hydrophilic than NH3 plasma-modified PTFE. Similar to NH3 plasma-modified PTFE, the wettibility of C2H2/NH3 plasma-modified PTFE decreased with storage time, but with lesser degree.

並列關鍵字

PTFE ； surface modification ； wettability ； NH3

參考文獻

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