研究生: |
葉佩娟 Pei-Chuan Yeh |
---|---|
論文名稱: |
橡膠態高分子在互溶性玻璃態界面奈米尺度擴散行為之研究 Studying the Nano-Scale Behavior of Diffusion between the Rubbery Polymer into the Glassy Interface |
指導教授: |
楊長謀
A. C.-M. Yang |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 材料科學工程學系 Materials Science and Engineering |
論文出版年: | 2001 |
畢業學年度: | 89 |
語文別: | 中文 |
論文頁數: | 108 |
中文關鍵詞: | 二次離子質譜儀 、原子力顯微鏡 、交互擴散 、CASE II diffusion 、玻璃態-橡膠態 、界面 |
外文關鍵詞: | SIMS, AFM, inter-diffusion, CASE II diffusion, glassy-rubbery state, interface |
相關次數: | 點閱:3 下載:0 |
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高分子間的交互擴散行為深受其分子鏈的運動模式所影響,本實驗中針對溶解度相近的兩互溶性高分子PS與PPO,利用薄膜疊層的方法,將其製成擴散偶並予以加熱處理以促進擴散行為的進行,同時藉由二次離子質譜術的優良縱深解析度,偵測其濃度曲線之分佈以提供有力之佐證,以求能了解其微觀尺度的物理性質;另外再藉由原子力顯微鏡觀察高分子薄膜再擴散進行時之表貌變化。實驗結果再次驗證PS/PPO界面會隨加熱時間的增加而往PPO方向移動,藉由DSIMS所測得之縱深濃度分佈圖中定量化分析發現,PS/PPO界面呈現陡峭分佈,在PS層內之PPO分子成均質分佈,而在PPO層之PPO濃度則維持在100%。證實了存在於PS/PPO擴散偶間的玻璃態-橡膠態交互擴散行為符合Case II 擴散行為模式之特徵。實驗中也發現,在以旋鍍法製備薄膜時,轉速增加所形成的擴散偶具有較高的擴散速率,但是如果在薄膜內增加一個內界面則會減緩擴散的進行。另外實驗成功地觀察到高分子擴散偶之薄膜表面因擴散所引起的起伏。
The diffusion in a polymer couple composed of glassy PPO and rubbery PS was explored by using SIMS and AFM to study the polymer chain diffusion across a glassy state interface. The diffusion across the interface was found to follow a typical Case-II diffusion in which the PS chains plasticize the glassy PPO chains in a thin intermixing layer (ca. 20 nm) at the interface. Once the PPO chains diffused out the intermixing layer, they quickly disperse themselves in the PS region forming a completely miscible blend. It was also found that the interface diffusion speed increases with the spin coating speed of the PPO thin film, implying an effect due to chain conformation and the residue stress in the glassy region. In addition, the propagation speed of the diffusion front in the glassy PPO region significantly slowed down in the vicinities of an internal interface created by separate spin coatings. The AFM surface topography of the diffusion couple clearly shows a roughening process associated with the polymer chain diffusion, indicating a nano-scale non-uniform distribution in the lateral directions of the diffusion front.
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