Poly(4-vinyl pyridine)과 poly(1-vinyl imidazole)의 4차염을 이용한 나노섬유 음이온교환막의 제조 및 특성분석

다국어 초록 (Multilingual Abstract)

The quaternary polymer salts(QPSs) of poly(4-vinyl pyridine)(PVPy) and poly(1-vinyl imidazole)(PVIm) were prepared through quaternization reaction between polymers and allyl bromide or butyl bromide. Then, the nanofibrous anion exchange membrane(AEM) was fabricated by electrospinning of blend solution of QPSs with poly(vinylidenefluoride-co-hexafluoropropylene)(PVdF-HFP) in dimethylformamaide(DMF). The operating conditions of electrospinning equipment were controlled to fabricate nanofiber mat stably and continuously such as voltage, tip to collector distance(TCD) and injection rate. The weight fraction of QPS in the membranes was controlled to confirm effects of the change of QPS content in membranes. The chemical structure of QPSs and surface morphology of membranes were confirmed by ATR-IR, 1H-NMR and SEM. By using TGA, thermal stability of membranes was confirmed. Electrochemical properties dependence on content of QPSs in membranes such as water uptake, ion exchange capacity and ion conductivity were investigated by Mohr titration and an impedance analyzer. Also, the solubility of membranes in acidic, basic conditions and deionized water was investigated.

목차 (Table of Contents)

• Ⅰ. 서론 1
• Ⅱ. 이론적 배경 4
• 2.1. 에너지 저장장치 (Energy storage system, ESS) 4
• 2.1.1. ESS의 정의 4
• 2.1.2. ESS의 종류 6
• 2.2. 이온교환막 (Ion exchange membrane) 10
• 2.3. 전기방사법 (Electro-spinning method) 14
• 2.3.1. 전기방사의 정의 14
• 2.3.2. 전기방사 조건 16
• Ⅲ. 실험 17
• 3.1. QPS의 합성 17
• 3.1.1. 재료 및 시약 17
• 3.1.2. PVIm의 중합 17
• 3.1.3. PVPy와 PVIm 4차염의 합성 18
• 3.2. 전기방사에 의한 나노섬유 음이온교환막 제조 21
• 3.2.1. 나노섬유 매트(mat) 제조 21
• 3.2.2. 나노섬유 음이온교환막 제조 21
• 3.3. 분석 방법 및 기기 23
• 3.3.1. 화학적 구조확인 23
• 3.3.2. 표면 모폴로지 분석 및 열중량 분석 23
• 3.3.3. 이온교환용량 및 함수율 측정 23
• 3.3.4. 이온전도도 측정 24
• 3.3.5. 화학적 안정성 측정 25
• Ⅳ. 결과 및 토론 26
• 4.1. 구조확인 26
• 4.2. 나노섬유 음이온교환막 제조 30
• 4.3. 열 안정성 분석 33
• 4.4. 함수율 및 이온교환용량 36
• 4.5. 이온전도도 40
• 4.6. 화학적 안정성 측정 43
• Ⅴ. 결론 47
• 참고문헌