臺灣博碩士論文加值系統

摘 要
本研究主要利用RF-plasma 對乳酸單體進行電漿聚合反應,藉由控制電漿設備條件與工作參數,以求在腔體基板中形成聚乳酸薄膜, 嘗試解決傳統聚乳酸的繁雜製備程序. 研究中我們發現室溫下透明乳酸單體經過電漿聚合後,會在基板上形成淡黃色的薄膜,其物理性質與傳統聚合法所形成的聚乳酸薄膜有所差異,因此暫時稱其為 “類-聚乳酸薄膜”. 在工作參數的調整上,在連串的實驗後，發現薄膜聚合結果最好的一次是在當RF-Plasma功率200瓦特、聚合時間60分鐘、基材的溫度為80℃、單體流量30sccm、反應腔體真空度約為0.5torr，可以在實驗基材表面形成一層淡黃色的類-PLLA薄膜，其厚度在玻璃基材上的約為1.36μm、在矽晶片基材上為1.23μm。我們將此利用電漿聚合所製成的薄膜放入ESCA中分析其組成,結果顯示出聚合薄膜的組成為碳、氧化合物，進一步的比對後，我們發現其組成結構與聚乳酸有高度的類似性。 此外,我們亦觀測FTIR光譜，發現光譜中存在聚乳酸聚合過程中最重要的酯化反應峰值（~1700cm-1）. 我們同時進行機械性質的比較, 利用micro-intentation的量測方式，發現經過RF-Plasma聚合過後的類-PLLA薄膜的楊氏係數與硬度平均值大於傳統聚乳酸薄膜,顯示RF-Plasma聚合形成的3-D Cross-linking可以提高薄膜材料的機械性質。

Abstract
Thin films poly(L-lactic acid, quasi-PLLA) were successfully synthesized for the first time using a rf plasma polymerization method. The vapor of L-lacitic acid monomers was pumped into a rf plasma chamber generated in Ar gas where the monomers polymerized and deposited a thin film on a glass substrate placed between a pair of parallel plate electrodes. The plasma thin film was analyzed using an atomic force microscope (AFM), FTIR and Auger-Esca. Initial Auger-Esca data confirmed that the film obtained from plasma polymerization is a quasi-PLLA thin film. Like the conventional PLLA prepared by esterification method, the plasma film showed the characteristic absorption peak of PLLA around 1700cm-1. Further, the ESCA and FTIR spectra of the plasma films demonstrated the chemical shifts of the characteristic peaks towards the lower frequencies, an effect attributed to the cross-linking chain structure in the plasma films. Using a microscopic indentation method, it was found that the plasma film demonstrated a 7 times increase of hardness compared to that of the convention PLLA films. The effect of polymerization temperature on the film topography of the plasma films was observed. Further experiments were currently undergoing.

目錄
第一章 簡介
第二章 文獻回顧
2-1 電漿化學
2-2 電漿態中之化學反應
2-3 低溫電漿高分子改質技術
2-4 聚乳酸的應用
2-5 高分子之力學狀態
2-6 高分子之力學性能
第三章 實驗方法
3-1 試藥
3-2 實驗方法
3-3 RF-Plasma儀器購置
3-4 原子力顯微鏡（AFM）表貌結構之觀測與研究
3-5 電子能譜化學分析儀（ESCA)
第四章 結果與討論
4-1以電子能譜化學分析儀來檢定RF-電漿聚合聚乳酸薄膜
4-2以傅立業紅外線轉換光譜檢定RF-Plasma聚合聚乳酸薄膜
4-3 RF-Plasma聚合乳酸薄膜之AFM觀察
4-4 RF-Plasma聚合乳酸薄膜的硬度測試
4-5類-PLLA的熱微差掃描卡計與凝膠滲透色層分析儀結果
第五章 結論
第六章 未來之實驗項目
第七章 參考文獻

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