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研究生:李敬琪
論文名稱:不同單體比例的陰離子型分散劑添加於鈦酸鋇粉末之分散性質
指導教授:許貫中許貫中引用關係
學位類別:碩士
校院名稱:國立臺灣師範大學
系所名稱:化學系
學門:自然科學學門
學類:化學學類
論文種類:學術論文
論文出版年:2007
畢業學年度:95
語文別:中文
論文頁數:114
中文關鍵詞:鈦酸鋇
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本篇研究係合成一種陰離子型共聚物: 聚二(二甲基丙烯酯)乙基磺酸鈉鹽/丙烯醯胺 (PMESA ),作為鈦酸鋇漿體(BT)的分散劑,探討在不同pH值下PMESA對於BT漿體中分散性質的影響。
PMESA是由二(二甲基丙烯酯)乙基磺酸鈉鹽(MES)和丙烯醯胺(AM)經自由基反應聚合而得。本研究利用1H-NMR 和 FT-IR光譜儀來量測確認共聚物的化學結構,以GPC量測聚合物的分子量,經由電位滴定估算PMESA中所含各單體的比例。
PMESA對鈦酸鋇漿體分散性質的影響主要經由漿體黏度、沈降體積、粒徑分佈、表面電位等實驗結果來探討;另外,並量測鈦酸鋇漿體中Ba2+的溶出量。
結果顯示出,添加PMESA能夠分散穩定水溶液系統的鈦酸鋇漿體,其效果與PMAAN相當;PMESA中所含有的MES比例愈多,對BT漿體分散效果愈好;其中以添加0.3 wt% PMESA(MES/AM=9/1)在pH=9時的漿體有最好的分散穩定效果。另外,添加PMESA能有效降低漿體中鋇離子的溶出。
This study has prepared of an anionic water-soluble copolymer, Poly (2-(2-methyl-acryloyloxy)ethylsulfonate-acrylamide) (PMESA) as a dispersant for barium titanate (BT) powder in water. The effects of this polymer on the dispersion properties of BT aqueous suspensions at various pH values were investigated.
PMESA was prepared from sodium 2-(2-methyl-acryloyloxy)ethyl sulfonate (MES) and acrylamide (AM) through a free radical polymerization. The chemical structure of PMESA were verified from their 1H-NMR and FT-IR spectra; the molecular weight of this polymer was measured by GPC; the monomer ratio in PMESA was determined by a potential titration method. The dispersion ability of PMESA on BT suspensions was evaluated from the results of viscosity, sedimentation, particle size, zeta potential and adsorption measurements. Besides, the amount of leached Ba2+ ions from BT particles in suspensions was also measured.
The result shows that incorporation of PMESA will reduce the viscosity and stabilize the BT suspensions. The dispersion property of this polymer is as good as PMAAN. PMESA with increasing MES moiety is more effective. It appears that incorporating 0.3 wt% PMESA with MES/AM=9/1 is most effective in making stable BT suspensions at pH=9. Additionally, PMESA could reduce the leached Ba2+ ions from solid particles in BT suspensions.
第一章 緒論 11
第二章 文獻 12
2-1 鈦酸鋇粉末 12
2-2 粒子特性 13
2-3 漿體中粒子間作用力 14
2-3 漿體中粒子間作用力 15
2-3-1 粒子間的作用力位能 15
2-3-2 DLVO理論 16
2-4漿體分散機制 17
2-4-1靜電排斥效應(electrostatic effect) 17
2-4-2立體阻障效應(steric effect) 17
2-5 漿體的分散系統 22
2-5-1分散劑對陶瓷漿體的重要性 22
2-6漿體分散性質評估 25
2-6-1漿體流變性質 25
2-6-2 Polymer的解離 26
2-6-2 Polymer的解離 27
2-6-3 BT粉體的鋇離子溶出 28
2-6-4 BT漿體沉降原理 29
2-6-4 BT漿體沉降原理 30
2-6-5 polymer的吸附 32
2-6-6界達電位 33
2-6-6界達電位 34
第三章 實驗流程與方法 36
3-1 實驗流程 36
3-2 實驗方法 38
3-2-1共聚物之合成 38
3-2-2共聚物單體比例分析 39
3-2-3凝膠滲透層析(GPC)分析 42
3-2-4分散劑固含量測量 45
3-2-5核磁共振(NMR)光譜分析 45
3-3 BT粉末之晶相分析 46
3-4 共聚物對鈦酸鋇漿體之分散性質測試 48
3-4-1 漿體的黏度量測 48
3-4-2 共聚物的吸附量測 48
3-4-3粒子表面電位量測 48
3-4-4 粒子之粒徑量測 49
3-4-5漿體中的鋇離子濃度測定 49
3-4-6 BT胚體的生胚密度 50
3-4-7 BT胚體的燒結密度 50
3-4-8 BT漿體的沉降實驗 52
3-4-9 PMESA的解離率(α) 52
3-4-10 BT胚體的SEM微結構分析 52
3-4-11介電常數與介電損失 53
3-5實驗材料與儀器 54
3-5-1材料 54
3-5-2儀器 54
第四章 結果與討論 56
4-1 PMESA結構分析 56
4-1-1 PMESA的IR圖分析 56
4-1-2 PMESA的1H-NMR光譜分析 58
4-2 PMESA的解離率 60
4-3 PMESA在BT粒子的吸附行為 63
4-4 PMESA對BT粒子界達電位的影響 73
4-5 PMESA對BT漿體黏度的影響 79
4-6 PMESA對BT粒子粒徑分佈的影響 82
4-7 PMESA對BT漿體沉降體積的影響 86
4-7 PMESA對BT漿體沉降體積的影響 87
4-8 PMESA對BT胚體密度的影響 94
4-9 PMESA對BT漿體微結構的影響 97
4-10 PMESA對BT漿體鋇離子溶出的影響 102
4-11 PMESA對BT漿體介電性質的影響 106
第五章 結論 107
第六章 參考文獻 109
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