具 C2-咪唑鹽之高親水端 陰離子交換膜的開發

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/73969

Title:	具 C2-咪唑鹽之高親水端陰離子交換膜的開發
Authors:	莊坤霖;Chaung, Qun-Ling
Contributors:	化學學系
Keywords:	高親水端;咪唑鹽;陰離子交換膜;ROMP;imidazole;anion exchange membrane;high conductivity
Date:	2017-07-20
Issue Date:	2017-10-27 12:56:55 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文開發出三種新親水端單體，且利用新合成之親水端單體，製備一系列高親水端高分子。第一系列 (NB-DCIm)，本實驗室首先開發出一個親水端小分子上帶有兩個離子交換集團之單體 NB-DCIm。但在後續研究中發現此單體結構中兩 imidazole group 的立體障礙會導致單體無法順利完成四級胺化，僅有其中之一可以順利反應。為了改良，我們研發出新單體 NB-BCIm 來解決此問題。第二系列 (BIm) ，本實驗室開發一個親水端分子上帶有兩個離子交換集團之單體 BIm。我們改變連接兩 imidazole group 之位置，經過實驗後已確定能順利將兩 imidazole group 四級胺化。但在實驗過程中我們發現 norbornene 和 imidazole group 之間若以醚類接連，此單體在鹼性環境下化學穩定性不良，為了改良高分子之化學穩定性，我們研發出更新的 NB 單體以解決此問題。第三系列 (NB-CIm-4)，本實驗室開發出新的 NB 親水端單體，將norbornene 和 imidazole group成功以烷鏈接連，此一新的 NB單體在60℃，鹼性 (NaOH) 的條件下無裂解之反應發生，驗證此一烷鏈接連之單體具非常好的化學穩定性。之後，我們成功的將此新單體進行 ROMP 的聚合，開發出新的無規共聚高分子 PNB-CIm-4 50%，在常溫去離子水中導電度最高可達 0.03 S/cm，而高親水端無規共聚物 PNB-CIm-4 90% 也經由工研院後續加工成膜，在常溫去離子水中導電度最高也達 0.074 S/cm，有望可應用在固態鹼性燃料電池當中。 ;In this study, three new hydrophilic monomers were synthesized and a new series of anion exchange membranes were derived from the last monomer. First, NB-DCImI was synthesized. However, due to the steric hindrance in the monomer structure, only one imidazole group can be quaternized. The second methylation of imidazole group was not successful. Secondly, new hydrophilic monomer BCIm-COH bearing two imidazole groups was successfully synthesized. However, we found the ether-linking hydrophilic monomer do not possess good chemical stability in the presence of NaOH/DMSO solution. Finally, new hydrophilic monomer NB-CImI-4 are developed which NB bearing a butyl imidazole group. The new developed monomer exhibits a very high chemical stability at 60 C for two weeks in the presence of NaOH/DMSO solution. Polymer PNB-CIm-4 was prepared via ring-opening metathesis polymerization (ROMP) of the new developed hydrophilic NB-CImI-4 and hydrophobic NB-Hex. Via changing the equivalence of these two NB monomers, the hydrophilic and hydrophobic ratio of the random copolymer can be controlled. Currently, PNB-CIm-4 (R-50) shows ionic conductivity of 0.03 S/cm. Highly hydrophilic PNB-CIm-4 (R-90) exhibits ion conductivity up to 0.074 S/cm.
Appears in Collections:	[Graduate Institute of Chemistry] Electronic Thesis & Dissertation

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