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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 이명훈
- 발행연도
- 2015
- 저작권
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In the LCD panel, red, green, and blue light generated by passing through the color filters shows different birefringence value with one another when it passes by a retardation layer. It is the wavelength dispersion property of the retardation layer that largely affects the LCD performance such as contrast ratio, color uniformity, and viewing angle.
Reactive mesogens (RM) structure contains aromatic rod-like mesogenic core and diallyl terminal groups. We synthesized two novel reactive mesogens containing photo-cross-linkable methacrylate with a 4-methoxycinnamyloxy phenyl side group and cinnamoyloxybiphenyl side group, respectively. Chemical structures of the reactive mesogens synthesized and their intermediate compounds were confirmed by proton nuclear magnetic resonance spectroscopy and the thermodynamic properties were analyzed using differential scanning calorimetry and polarized optical microscopes. The photochemistry of cinnamates involves two photoreactions ; the trans-cis photoisomerization and the [2+2] photodimerization. Reversion of the reorientation direction of the mesogenic groups of the RM generated by irradiation with UV light changes the birefringence and the wavelength dispersion property. To elucidate the effect of the wavelength dispersion property , fabricated cells were irradiated with UV light at various exposure intensity and time. Property of the resulting wavelength dispersion of retardation was also discussed.
Reactive mesogens (RM) structure contains aromatic rod-like mesogenic core and diallyl terminal groups. We synthesized two novel reactive mesogens containing photo-cross-linkable methacrylate with a 4-methoxycinnamyloxy phenyl side group and cinnamoyloxybiphenyl side group, respectively. Chemical structures of the reactive mesogens synthesized and their intermediate compounds were confirmed by proton nuclear magnetic resonance spectroscopy and the thermodynamic properties were analyzed using differential scanning calorimetry and polarized optical microscopes. The photochemistry of cinnamates involves two photoreactions ; the trans-cis photoisomerization and the [2+2] photodimerization. Reversion of the reorientation direction of the mesogenic groups of the RM generated by irradiation with UV light changes the birefringence and the wavelength dispersion property. To elucidate the effect of the wavelength dispersion property , fabricated cells were irradiated with UV light at various exposure intensity and time. Property of the resulting wavelength dispersion of retardation was also discussed.
목차
I. 서론 1II. 이론적 배경2.1 액정 32.1.1 액정의 정의 32.1.2 액정의 물성 62.1.3 광학적 이방성 92.1.4 유전율과 굴절률 102.1.5 위상지연 122.2 반응성 액정 단량체 (RM, reactive mesogens) 132.2.1 반응성 액정 단량체 (RM)의 정의 및 구조 132.2.2 반응성 액정 단량체 (RM)를 이용한 필름 제작 162.3 광중합 (Photopolymerization) 172.3.1 광중합의 정의 172.3.2 광반응을 위한 빛의 흡수 172.3.3 라디칼 중합 182.4 액정 분자의 배향 192.4.1 러빙법 192.4.2 광배향법 212.5 [2+2]-Cycloaddition 22III. 실험 243.1 시 약 243.2 측정 장비 및 실험조건 253.3 반응성 액정 단량체의 합성 263.4 셀 및 혼합물 제조 323.5 자외선 광을 이용한 액정 셀의 노광 333.5.1 광중합을 위한 노광 조건 333.5.2 광이량화 반응을 위한 노광 조건 33IV. 결과 및 고찰 344.1 반응성 액정 단량체의 합성과 구조분석 344.2 반응성 액정 단량체의 열적 분석 414.3 반응성 액정 단량체의 광학 특성 454.4 노광 시간에 따른 셀의 변화 관찰 494.5 노광 시간에 따른 위상지연 값의 변화 측정 59V. 결 론 63VI. 참 고 문 헌 64
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