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분산매질에서 합성한 폴리아닐린의 물성
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | 李碩炫 | - |
| dc.contributor.author | 이동혁 | - |
| dc.date.accessioned | 2019-10-21T06:46:01Z | - |
| dc.date.available | 2019-10-21T06:46:01Z | - |
| dc.date.issued | 2005 | - |
| dc.identifier.other | 53 | - |
| dc.identifier.uri | https://dspace.ajou.ac.kr/handle/2018.oak/16375 | - |
| dc.description | 학위논문(석사)--아주대학교 대학원 :분자과학기술학과 / 재료화학전공,2005 | - |
| dc.description.abstract | 본 연구에서는 Solvent Dispersion method 라는 새로운 폴리아닐린의 제조법을 소개한다. 일반적인 폴리아닐린의 제조방법인 MacDiarmid method 의 수용액상의 중합과는 차별화된 Solvent Dispersion method 은 서로 섞이지 않는 수용액과 유기용매를 교반하여 안정제 없이 분산시킨 매질에서의 합성법이다. 양친성인 모노머와 고분자 성장 사슬들은 계면에너지를 낮추기 위해 마치 안정제와 같이 분산매질의 계면에 위치하게 된다. 기존 MacDiarmid method 의 수용액상의 무작위적인 반응과는 달리 분산매질에서 중합위치는 계면으로 한정되기 때문에 부반응에 의한 구조적 결함이 줄어들게 된다. 이에 따라 형성되는 폴리머의 형태는 높은 전도도와 용해도를 제공하게 된다. 이렇게 얻어진 폴리아닐린 분말을 SEM, IR, NMR, I.V 를 측정하여 분석하였고, 필름을 제조하여 UV-Vis-NIR spectroscopy, 전기전도도 그리고 전자기파 간섭 차폐효율 (Electromagnetic Interference Shielding Efficiency ; EMI SE)을 확인하였다. | - |
| dc.description.tableofcontents | 목차 Abstract = ⅰ 요약문 = ⅱ 목차 = ⅲ 그림 목차 = ⅴ 표목차 = ⅵ Ⅰ. 서론 = 1 Ⅱ. 문헌연구 = 3 Ⅱ. 1 Conducting Polymers = 3 Ⅱ. 1. 1 Electroactive Polymers = 3 Ⅱ. 1. 2 Conduction Mechanism = 5 Ⅱ. 1. 3 Preparation of conductive polymers = 7 Ⅱ. 2 Polyaniline = 8 Ⅱ. 2. 1 Synthesis, Characterization and Processing of Polyaniline = 9 Ⅱ. 2. 1. 1 Protonic acid dopping = 10 Ⅱ. 2. 1. 2 Chemical Synthesis of Polyaniline = 12 Ⅱ. 2. 1. 3 Characterization of As-Synthesized Polyaniline Emeraldine Base = 12 Ⅱ. 2. 1. 3. 1 Elemental Analysis = 12 Ⅱ. 2. 1. 3. 2 Ultraviolet-Visible NIR Spectra = 13 Ⅱ. 2. 1. 3. 3 Fourier Transform Infrared = 13 Ⅱ. 2. 1. 3. 4 Thermogravimetric Analysis = 15 Ⅱ. 2. 1. 4. Processing of Polyaniline = 15 Ⅲ.실험 = 17 Ⅲ.1 시약 및 기기 = 17 Ⅲ.1.1 시약 = 17 Ⅲ.1.2 기기 = 17 Ⅲ.2 Polyaniline 합성 = 18 Ⅲ.3 polyaniline emeraldine base 의 점도(I.V.) 측정 = 19 Ⅲ.4 polyaniline 필름 제조 = 19 Ⅲ.4.1 Polyaniline(emeraldine salt ES) 용액 제조 = 19 Ⅲ.4.2 필름 제조 = 19 Ⅲ.5 전기전도도 측정 = 20 Ⅲ.5.1 필름의 전기전도도 측정 = 20 Ⅲ.6 전자기파 차폐효율 측정 = 24 Ⅳ. 결과 및 고찰 = 25 Ⅳ.1. Microscopic Images & SEM Images = 25 Ⅳ.2. IR spectroscopy = 29 Ⅳ.3. Solid-State ^(13)C NMR Spetroscopy = 30 Ⅳ.4. UV-Vis-NIR Spetroscopy = 31 Ⅳ.5. Conductivities & I.V = 32 Ⅳ.6. Measurements of EMI Shielding Efficiency = 35 Ⅴ. 결론 = 40 Ⅵ. 참고문헌 = 41|그림목차 Fig. Ⅱ.1 Conductivity ranges for polymers materials = 4 Fig. Ⅱ.2 Schematic diagram showing the principles of band theory. = 5 Fig. Ⅱ.3 Structures and conductivity of doped conjugated polymers = 6 Fig. Ⅱ.4 General composition and various oxidation states of polyaniline = 9 Fig. Ⅱ.5 Schematic process of potonation of emeraldine base = 11 Fig. Ⅱ.6 (a) UV-vis-NIR spectrum of the as-synthesized PANI-EB solution in NMP;(b)FT-IR spectrum (KBr powder diffuse reflectance) of the as-synthesized PANI-EB powder; and (c)TGA of the as-synthesized PANI-EB powder under Ar flow (scan rate 20℃/min) = 14 Fig. Ⅲ.1 Conductivity measurement for 4 probe method on free standing films = 21 Fig. Ⅲ.2 Schematic of collinear four-point probe = 22 Fig. Ⅲ.3 Instrumental setup for measuring shielding effectiveness(SE) & the coaxial sample holder 24 Fig. Ⅳ.1 Photomicroscophic images of droplets in a medium of chloroform/aqueous acid. = 26 Fig. Ⅳ.2 SEM images of Polyaniline powder prepared at -35℃ in a medium of chloroform/aqueous acid = 27 Fig. Ⅳ.3 SEM images of Polyaniline powder prepared at -40℃ in an aqueous medium by the standard method. = 28 Fig. Ⅳ.4 IR spectra of PANI emeraldine bases = 29 Fig. Ⅳ.5 Solution state ^(13)C NMR spectra of PANI EB solutions in CDCl₃prepared at 0℃ = 30 Fig. Ⅳ.6 Comparison of UV-Vis-NIR spectra and conductⅣities of PANI/CSA film prepared in m-cresol solution = 31 Fig. Ⅳ.7 ConductⅣity of PANI Film = 34 Fig. Ⅳ.8 EMI shielding Efficiency of PANI/CSA blend Film = 36 Fig. Ⅳ.9 Comparison of experimental and simulated SE results = 38 Fig. Ⅳ.10 Analysis of EMI shielding mechanism of PANI/CSA Film = 39|표목차 Table Ⅲ.1 필름의 모양과 두께에 따른 전기장 factor C = 23 Table Ⅲ.2 HP 8719ES VNA의 사양 = 24 Table Ⅳ.1 Polyaniline(EB)의 I.V와 Polyaniline(ES) 필름의 전기전도도 = 33 | - |
| dc.language.iso | kor | - |
| dc.publisher | The Graduate School, Ajou University | - |
| dc.rights | 아주대학교 논문은 저작권에 의해 보호받습니다. | - |
| dc.title | 분산매질에서 합성한 폴리아닐린의 물성 | - |
| dc.title.alternative | Properties of Polyaniline Prepared in a Dispersion Medium | - |
| dc.type | Thesis | - |
| dc.contributor.affiliation | 아주대학교 일반대학원 | - |
| dc.contributor.department | 일반대학원 분자과학기술학과 | - |
| dc.date.awarded | 2005. 2 | - |
| dc.description.degree | Master | - |
| dc.identifier.localId | 564504 | - |
| dc.identifier.url | http://dcoll.ajou.ac.kr:9080/dcollection/jsp/common/DcLoOrgPer.jsp?sItemId=000000000053 | - |
| dc.description.alternativeAbstract | We introduce a novel synthetic method for polyaniline ; solvent dispersion method. Instead of using conventional homogeneous polymerization in an aqueous medium, whch is performed in a heterogeneous organic/aqueous biphasic system without any stabilizers at sub-zero temperatures down to -40℃. The micelles formed by the monomer and growing polymer chain act as a stabilizer like in the formation of PANI nanostructure. Polymerization based on this concept produced a low content of defects and could afford access to highly conductive and soluble polyaniline with otherwise inaccessible particle morphology. The polyaniline is characterized by viscosity, SEM, IR, ^(13)C NMR, UV-Vis-NIR spectroscopy, conductivity and EMI shielding effectiveness measurements. The shielding efficiency measurements were carried out using co-axial transmission line method in range of 0.05-13.51GHz. | - |
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