大氣電漿處理聚苯乙烯及表面接枝聚合聚異丙基丙烯醯胺之研究

Photo-induced Grafting Polymerization of N-isopropylacrylamide onto Polystyrene surface by Atmospheric Plasma Treatment (APT)

張光輝(Kuang-Hui Chang)

指導教授 ： 陳克紹

大同大學/工程學院/材料工程學系所/碩士(2009年)

摘要

聚苯乙烯(PS)為一個泛用的高分子材料，經常應用在生醫材料和光學材料上面。但它的缺點為疏水性質和低表面能，導致表面的吸附性質差及其他的材料不容易塗層在表面。本研究以He，N2及He+N2大氣電漿對聚苯乙烯進行表面處理，再以紫外光接枝感溫性水膠，聚異丙基丙烯醯胺(N-isopropylacrylamide (NIPAAm))或丙烯酸(Acrylic acid (AAc)在聚苯乙烯的表面上。大氣電漿在處理上，比起傳統低壓電漿，能更快速且能連續處理基材表面。實驗結果發現，He大氣電漿處理PS基材後，表面之水接觸角可由原本的78度降到約低於10度以下。由X光光電子能譜儀分析發現，處理後表面增加了C=O和O-C=O等官能基。
親水性效果以He最好、He+N2次之、N2最小。聚苯乙烯經由大氣電漿處理後，不但提升了表面能和親水性質和能使高分子成功接枝固定其表面上。接枝聚合效果以He+N2最好、He次之、N2較差，而電漿處理時間較長對接枝聚合量有增加傾向。接枝固定在PS表面上之AAc單位面積重量範圍為 0.5至 3.0 mg/cm2。而接枝固定在PS表面上之NIPAAm單位面積重量範圍為 0.4至 6.5 mg/cm2，其本身之溫度轉換特性出現在 33°C。

關鍵字

大氣電漿 ； 聚異丙基丙烯醯胺 ； 光接枝聚合

並列摘要

Polystyrene (PS) is one of the important polymers and has usually been used as biomedical material and optical material etc. However, there are troublesome problems for PS because it`s hydrophobicity and low surface energy that induces poor adhesion and coating properties. In this study, Atmospheric plasma pretreatment (APT) of using He、N2、and He/N2 gas were carried out and subsequent photo-induced grafting polymerization N-isopropylacrylamide (NIPAAm) or Acrylic acid (AAc) on PS. By the way, Atmospheric pressure plasma can easy integrate into existing production lines and treated time has more shortly than low temperature glow discharge plasma. As the results, contact angles of PS substrate decrease from 78° to less than 10° by helium ATP. Surface analyses by Electron Spectroscopy for Chemical (ESCA) using Atmospheric-Pressure plasma treatment on the surface indicate that the C=O and O-C=O functional groups were formed after the Atmospheric plasma pretreatment, which was most likely to account for the increase of surface hydrophilicity.
Helium has the best hydrophilicity, then following is He/N2, and the nitrogen has the worst hydrophilicity. Polystyrene(PS) treated by APT can increase surface energy and hydrophilicity that promoted the photo-induced grafting polymerization polymer on PS surface. The effect of grafting polymerization is He/N2＞He＞N2, and the longer time of treatment can raise the volume of grafting polymerization. The range of weight vary grafting PAAc is between 0.5 and 3.0 mg/cm2. and PNIPAAm is between 0.4 and 6.5 mg/cm2. Then lower critical solution temperature (LCST) is 33°C.

並列關鍵字

Atmospheric plasma pretreatment ； N-isopropylacrylamide ； Photo-induced graft polymerization.

參考文獻

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