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  • 學位論文

分散劑的合成與在鈦酸鋇陶瓷材料的應用

Dispersant synthesis and its Dispersing Ability on Barium Titanate

指導教授 : 許貫中
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摘要


本研究主要為合成一種兩性高分子聚合物 poly (α-N,N-dimethyl-acryloxyethyl) ammonium ethnateacrylamide ,(PDAAE),作為鈦酸鋇漿體的分散劑並改變起始劑濃度、控制反應時間和反應溫度來改變PDAAE分子量,以便找出具最佳分散效果的PDAAE分子量,最後和商用之分散劑ammonium salt of polymethylacrylic acid(PMAAN)來作比較。而PDAAE係以丙烯酸二甲胺乙酯和氯醋酸鈉反應生成DAAE單體,再與丙烯醯胺經自由基反應而得,合成之DAAE單體和PDAAE均以1H-NMR與IR光譜確認結構,並利用GPC測量PDAAE之分子量。 本研究主要為利用黏度法、沈降體積法、粒徑分佈法等方法來比較兩種分散劑的分散效果。並利用表面電位法、高分子在水中之解離程度和高分子在粒子表面之吸附程度來作解釋。最後,利用ICP-AES來測量鋇離子溶出量,並以此判斷分散劑對鈦酸鋇在水中的鋇離子溶出量之影響。 結果顯示Mw=1.06×105之PDAAE在鈦酸鋇漿體中之分散效果最好,並發現漿體中之鋇離子溶出量明顯減少,主要原因為在pH=12時,Mw=1.06×105之PDAAE在鈦酸鋇粉體表面有較大之飽和吸附量,因此得以吸附和結合較多之鋇離子。 另外,鈦酸鋇漿體經由壓胚和燒結後,測量胚體之燒結密度、生胚密度、介電常數和介電損失後,以添加Mw=1.06×105之PDAAE的鈦酸鋇漿體製成之生胚有較大之密度,而燒結後之胚體,其介電常數值較高,介電損失較低並且燒結體之相對密度也較大,因此顯示Mw=1.06×105之PDAAE對鈦酸鋇漿體之分散效果最好。

並列摘要


This study has prepared an amphibious dispersant, poly (α-N,N-dimethyl-acryloxyethyl) ammonium ethnateacrylamide ,(PDAAE)was used for the dispersion of BaTiO3(BT) colloids in aqueous solution, and used change initiator concentration, reaction temperature and reaction time to control molecule weight, and compared to that of a commercial acrylic-base polymeric dispersant, ammonium salt of polymethylacrylic acid PMAAN (Darven C). First, poly (α-N,N-dimethyl-acryloxyethyl) ammonium ethnateacrylamide was prepared from α-N,N-dimethyl acryloxyethyl and acrylamide through a free radical copolymerization, and α-N,N-dimethyl acryloxyethyl was made by reacting 2-(Dimethylamino)ethyl acrylate with sodium chloroacetate. The chemical structures of PDAAE have been identified and confirmed by H-NMR and IR spectra, and molecule weight was measured by GPC. Second, the dispersion properties of each dispersant have been evaluated by the viscosity, sedimentation volume, particle size distribution, and used zeta potential, fraction dissociated, adsorption consistency to explain. The result indicate that PDAAE have Mw=1.06×105 show better dispersion effects on the BaTiO3 powder in aqueous slurries than other molecule weight and PMAAN. The PDAAE causes less Ba2+ ions to be dissolved into solution, for greater amount of PDAAE adsorbed on BaTiO3 particles and more Ba2+ ions also adsorbed. The resulting green parts with PDAAE (Mw=1.06×105) show greater density, and the sintered parts have higher dielectric constant, lower dielectric loss, and greater density. Thus, PDAAE (Mw=106,000) exhibit better dispersion properties than other molecule weight and PMAAN.

並列關鍵字

BaTiO3 powder synthesis properties

參考文獻


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