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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 방문수
- 발행연도
- 2016
- 저작권
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In this study, liquid crystalline polymers were studied for use as high temperature thermochromic materials. Three types of polymers (main-chain, side-chain, and combined polymers) were synthesized by direct polycondensation, and they have mesogenic groups at different positions and different compositions.
Chemical structures and properties of the synthesized low molecular compounds and polymers were investigated by FT-IR, 1H-NMR, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD), polarizing optical microscopy (POM), and UV-Visible spectrometry.
The MP-A3 and MP-A5 of main-chain polymers (MP), side-chain polymers (SP), and combined polymers (CP) were liquid crystalline polymers. The side-chain polymers and combined polymers were amorphous or low crystallinity owing to the bulkiness of side groups; they showed liquid crystallinity in the temperarure range of 90-300℃, and as the azo group content on the side groups increased, their transition temperatures indicated high.
The side-chain polymers and combined polymers showed cholesteric liquid crystal phases as the cholesteryl group content increased, and nematic liquid crystal phases as the azobenzene group content increased. CP-A3C7 and CP-A5C5 exhibited thermochromism at high temperatures.
The azobenzene groups in the side-chain polymers and combined polymers appeared to photoisomerize when the polymer solutions were exposed to UV or Visible light of a particular wavelength, and SP-A5C5 and CP-A5C5 exhibited the highest photoisomerization rates among the liquid crystalline polymers. In conclusion, CP-A3C7 and CP-A5C5 can be utilized as thermochromic materials at high temperatures.
Chemical structures and properties of the synthesized low molecular compounds and polymers were investigated by FT-IR, 1H-NMR, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD), polarizing optical microscopy (POM), and UV-Visible spectrometry.
The MP-A3 and MP-A5 of main-chain polymers (MP), side-chain polymers (SP), and combined polymers (CP) were liquid crystalline polymers. The side-chain polymers and combined polymers were amorphous or low crystallinity owing to the bulkiness of side groups; they showed liquid crystallinity in the temperarure range of 90-300℃, and as the azo group content on the side groups increased, their transition temperatures indicated high.
The side-chain polymers and combined polymers showed cholesteric liquid crystal phases as the cholesteryl group content increased, and nematic liquid crystal phases as the azobenzene group content increased. CP-A3C7 and CP-A5C5 exhibited thermochromism at high temperatures.
The azobenzene groups in the side-chain polymers and combined polymers appeared to photoisomerize when the polymer solutions were exposed to UV or Visible light of a particular wavelength, and SP-A5C5 and CP-A5C5 exhibited the highest photoisomerization rates among the liquid crystalline polymers. In conclusion, CP-A3C7 and CP-A5C5 can be utilized as thermochromic materials at high temperatures.
목차
I. 서론1. 액정 12. 액정고분자 42.1. 주사슬 액정고분자 52.2. 곁사슬 액정고분자 52.3. 복합형 액정고분자 63. 열 변색 액정 64. 광이성질화 85. 연구목적 9II. 실험1. 시약 및 용매 102. 기기 103. 합성 103.1. 4,4''-Dihydroxyazobenzene, (DHAB)의 합성 113.2. 아조벤젠기를 갖는 액정화합물의 합성 123.3. 콜레스테릴기를 갖는 액정화합물의 합성 143.4. 액정고분자의 합성 174. 특성 분석 20III. 결과 및 고찰1. 저분자 액정화합물의 특성 211.1. 구조 확인 211.2. 열적특성 251.3. 액정성 262. 주사슬 액정고분자의 특성 272.1. 구조확인 272.2. 점성도 및 용해도 272.3. 열적특성 302.4. 액정성 343. 곁사슬 액정고분자의 특성 353.1. 구조확인 353.2. 점성도 및 용해도 383.3. 열적특성 383.4. 액정성 433.5. 광화학성 454. 복합형 액정고분자의 특성 484.1. 구조확인 484.2. 점성도 및 용해도 514.3. 열적특성 514.4. 액정성 564.5. 광화학성 58IV. 결론참고문헌Abstract
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