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研究生:吳建忠
研究生(外文):Chien-Chung Wu
論文名稱:羧酸改質幾丁聚醣溶液物理性質
論文名稱(外文):The Solution Properties of Methylcarboxylated Chitosan Solutions
指導教授:余子隆
指導教授(外文):T.L. Yu
學位類別:碩士
校院名稱:元智大學
系所名稱:化學工程學系
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:2003
畢業學年度:91
語文別:中文
中文關鍵詞:幾丁聚醣
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本研究主要以化學改質法製備不同取代比例之N,O─羧甲基幾丁聚醣。使用傅立葉紅外線光譜儀和核磁共振光譜儀鑑定分析改質幾丁聚醣的化學結構。改質後的幾丁聚醣溶於醋酸/醋酸鈉緩衝溶液和純水中,利用尤伯列德粘度管、雷射光散射儀和動態黏彈儀探討在不同pH值下的溶解度、黏度、流變性質及分子鏈形態。經羧甲基改質後的產物可溶於中性(pH 7.0)水溶液中。發現低改質比例的幾丁聚醣易溶於低pH值的水溶液;高改質比例的幾丁聚醣易溶於高pH值(pH>7.0)的水溶液。從極限黏度、黏彈儀測定、和動態光散射的數據顯示低改質比例的幾丁聚醣在低pH值的溶解性較佳、極限黏度較大、幾丁聚醣分子鏈在溶液中容易伸張,所以粒徑較大。隨著幾丁聚醣羧甲基改質比例提高,溶解改質幾丁聚醣水溶液的pH值也必須提高。在羧甲基改質比例達80%以上,pH<6.0的水溶液無法溶解它,必須使用pH>7.0的水溶液溶解。充分顯示出兩性聚電解質的特性。
中文摘要.....................................................I
英文摘要....................................................Ⅱ
致謝........................................................Ⅲ
目錄...........…………………………………………………….....Ⅳ
表目錄……………………………………………………………….....Ⅵ
圖目錄…………………………………………………………………….Ⅶ
一、前言…………………………………………………………………..1
1.1 簡介………………………………………………………….......1
1.2 幾丁聚醣理化性質…..……………………………………….....4
1.2.1 溶解性………………………………………………...4
1.2.2 去乙醯度……………………………………………...4
1.3 聚電解質之性質……..……………………………………….....6
1.4 研究目的………….…..………………………………………....6
1.5 文獻回顧…………………………………………..………….....8
二、實驗方法及步驟…………………………………………………….12
2.1 實驗藥品………………………………………………………12
2.2 儀器設備………………………………………………………14
2.3 實驗步驟……………………………………………………..15
2.3.1幾丁聚醣改質化學反應………………………………..15
2.3.2傅立葉轉換紅外光譜儀分析……..................16
2.3.3元素分析..........................…………....16
2.3.4高磁場核磁共振光譜儀分析……...………………….16
2.3.5極限黏度之量測.....................…………...16
2.3.5.1溶解度測定..........................................16
2.3.5.2黏度測定............................................16
2.3.6動態黏彈儀實驗.……….....………………………..19
2.3.7動態光散射實驗….....……………………………...22
三、結果與討論………………………………………………………….28
3.1改質幾丁聚醣樣品分析………………………………………..28
3.1.1傅立葉轉換紅外光譜儀分析結果...............28
3.1.2元素分析結果...............................28
3.1.3核磁共振分析結果...........................28
3.2黏度測定....................…………………………....39
3.2.1改質幾丁聚醣之溶解度分析..........39
3.2.2改質幾丁聚醣之極限黏度............39
3.3動態黏彈實驗........................................49
3.4動態光散射實驗………………………………………………..58
四、結論………………………………………………………………….87
五、參考文獻…………………………………………………………….89
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