臺灣博碩士論文加值系統

本文研究的目的在利用CO2為反溶劑由甲苯溶液中分離出共聚高分子COC(Cycloolefin Copolymer)，以改善由傳統反溶劑分離所產生的溶劑殘留、顆粒膠結均勻度不佳等問題。實驗方式是將高分子溶液經由0.4 mm孔徑大小的噴嘴噴灑進充滿反溶劑CO2的沈澱槽中，由於噴嘴可將溶液霧化成微小液滴，以及壓縮流體快速的質傳效果，可在瞬間提供很大的過飽和度，使得高分子大量沈積，在經由CO2連續清洗沈澱槽內的高分子結晶，以降低其溶劑殘留，達到乾燥的目的。實驗操作變數包括溫度、壓力、溶液濃度、CO2流速、溶液流速及液面高度等，結果發現均能夠得到95%以上的產率。就COC沈澱結構(Morphology)來看，氣液平衡且液面高度為沈澱槽1/2以下的操作均可得小於1µm的圓球體。就濃度來看，6wt%以下的濃度時其沈積機制為成核及成長機制(Nucleation and Growth)，因此形成粉末的巨觀和圓球體的微觀結構；7wt%以上的濃度下則是以自發相分離的機制(Spinodal Decomposition)沈積，因而形成團狀物的巨觀和多孔纖維的微觀結構。CO2流速對COC的結構影響不大，顯示主要控制粒徑大小的是韋伯數，而增加溶液流速的操作條件下能使高分子溶液更加能夠霧化而形成更小的微粒。析出後的COC經分析發現玻璃轉化溫度 (Glass Transition Temperature, Tg)及分子量均與原始的COC顆粒相差不大，表示可以CO2為反溶劑分離COC與甲苯。

編號 內容 頁數
壹 前言 1
貳 文獻回顧 4
參 實驗部分 18
3-1 主要實驗設備 18
3-2 實驗藥品 20
3-3 實驗步驟 20
3-4 分析儀器 22
肆 實驗結果與討論 23
4-1 壓力與溫度的影響 23
4-2 COC溶液濃度的影響 39
4-3 CO2流速和COC溶液流速的影響 43
4-4 液相CO2液面高度的影響 49
4-5 COC析出物之性質分析 49
伍 結論 53
陸 參考文獻 55

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