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      부분 불소화된 하키스틱형 반응성 메소겐의 합성 및 표면 배향 특성 = Synthesis and Surface Anchoring Property of Partially Fluorinated HockeyStick-Shaped Reactive Mesogens

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      https://www.riss.kr/link?id=A108594164

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      다국어 초록 (Multilingual Abstract)

      In order to apply electro-optical properties of liquid crystals (LC) to practical devices, uniform alignment of directors is an essential requirement. Recently, it has been reported that introducing a reactive mesogen (RM) can improve the anchoring energy for surface alignment. So far, studies on the azimuthal anchoring energy of the planar alignment mode related to rod-like RMs have been mainly reported. In this study, the effect of introducing an asymmetric bent-core RM, i.e., a hockey stick-shaped RM, on the polar anchoring energy of vertical alignment (VA) mode was investigated. The structure of the obtained RM was identified using 1H NMR, FTIR spectroscopy and elemental analysis. Their mesomorphic behavior was characterized by differential scanning calorimetry (DSC) and polarized microscope (POM). The VA-mode cell was fabricated by spin-coating a mixture of RM and VA agents, injecting LC with a negative dielectric constant, and photocuring by UV-irradiation, and the electro-optical properties were evaluated.
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      In order to apply electro-optical properties of liquid crystals (LC) to practical devices, uniform alignment of directors is an essential requirement. Recently, it has been reported that introducing a reactive mesogen (RM) can improve the anchoring en...

      In order to apply electro-optical properties of liquid crystals (LC) to practical devices, uniform alignment of directors is an essential requirement. Recently, it has been reported that introducing a reactive mesogen (RM) can improve the anchoring energy for surface alignment. So far, studies on the azimuthal anchoring energy of the planar alignment mode related to rod-like RMs have been mainly reported. In this study, the effect of introducing an asymmetric bent-core RM, i.e., a hockey stick-shaped RM, on the polar anchoring energy of vertical alignment (VA) mode was investigated. The structure of the obtained RM was identified using 1H NMR, FTIR spectroscopy and elemental analysis. Their mesomorphic behavior was characterized by differential scanning calorimetry (DSC) and polarized microscope (POM). The VA-mode cell was fabricated by spin-coating a mixture of RM and VA agents, injecting LC with a negative dielectric constant, and photocuring by UV-irradiation, and the electro-optical properties were evaluated.

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      참고문헌 (Reference)

      1 김일형 ; 김욱수 ; 하기룡, "폴리이미드 배향막의 편광 자외선 조사에 따른 액정 배향 메커니즘" 한국고분자학회 26 (26): 209-217, 2002

      2 이몽룡 ; 송기국 ; 배진우 ; 김안나 ; 윤형석, "러빙한 유리 기판을 이용한 반응성 액정 배향" 한국고분자학회 39 (39): 174-179, 2015

      3 Fréedericksz, V., "Theoretisches und Experimentelles zur Frage nach der Natur der anisotropen Flüssigkeiten" 42 : 532-546, 1927

      4 Jérôme, B., "Surface Effects and Anchoring in Liquid Crystals" 54 : 391-451, 1991

      5 Yaroshchuk, O., "Stabilization of Liquid Crystal Photoaligning Layers by Reactive Mesogens" 95 : 021902-, 2009

      6 Berreman, D. W., "Solid Surface Shape and the Alignment of an Adjacent Nematic Liquid Crystal" 28 : 1683-1686, 1972

      7 Chaudhari, P., "SelfOrdering of Cell Configuration of Anodic Porous Alumina with Large-Size Pores in Phosphoric Acid Solution" 37 : L1340-L1342, 1998

      8 Kim, J. -H., "Rubbing Strength Dependence of Surface Interaction Potential and Surface-Induced Order above the Nematic–Isotropic Transition" 84 : 6027-6033, 1998

      9 Ichimura, K., "Reversible Change in Alignment Mode of Nematic Liquid Crystals Regulated Photochemically by Command Surfaces Modified with an Azobenzene Monolayer" 4 : 1214-1216, 1988

      10 Oka, S., "Relationship between Surface Order and Surface Azimuthal Anchoring Strength of Nematic Liquid Crystals" 69 : 061711-, 2004

      1 김일형 ; 김욱수 ; 하기룡, "폴리이미드 배향막의 편광 자외선 조사에 따른 액정 배향 메커니즘" 한국고분자학회 26 (26): 209-217, 2002

      2 이몽룡 ; 송기국 ; 배진우 ; 김안나 ; 윤형석, "러빙한 유리 기판을 이용한 반응성 액정 배향" 한국고분자학회 39 (39): 174-179, 2015

      3 Fréedericksz, V., "Theoretisches und Experimentelles zur Frage nach der Natur der anisotropen Flüssigkeiten" 42 : 532-546, 1927

      4 Jérôme, B., "Surface Effects and Anchoring in Liquid Crystals" 54 : 391-451, 1991

      5 Yaroshchuk, O., "Stabilization of Liquid Crystal Photoaligning Layers by Reactive Mesogens" 95 : 021902-, 2009

      6 Berreman, D. W., "Solid Surface Shape and the Alignment of an Adjacent Nematic Liquid Crystal" 28 : 1683-1686, 1972

      7 Chaudhari, P., "SelfOrdering of Cell Configuration of Anodic Porous Alumina with Large-Size Pores in Phosphoric Acid Solution" 37 : L1340-L1342, 1998

      8 Kim, J. -H., "Rubbing Strength Dependence of Surface Interaction Potential and Surface-Induced Order above the Nematic–Isotropic Transition" 84 : 6027-6033, 1998

      9 Ichimura, K., "Reversible Change in Alignment Mode of Nematic Liquid Crystals Regulated Photochemically by Command Surfaces Modified with an Azobenzene Monolayer" 4 : 1214-1216, 1988

      10 Oka, S., "Relationship between Surface Order and Surface Azimuthal Anchoring Strength of Nematic Liquid Crystals" 69 : 061711-, 2004

      11 Kim, Y., "Optical Retardation of UV-curable Reactive Mesogen with Vertical Alignment" 7 : 4225-4232, 2017

      12 Broer, D., "On the History of Reactive Mesogens : Interview with Dirk J" 32 : 1905144-, 2020

      13 Boamfa, M. I., "Observation of Surface and Bulk Phase Transitions in Nematic Liquid Crystals" 421 : 149-152, 2003

      14 Arafune, R., "Noisy Le´vy Walk Analog of Two-Dimensional DNA Walks for Chromosomes of S" 58 : 914-918, 1998

      15 Komitov, L., "Nano-Engineering of the Anchoring of Liquid Crystals on Solid Surfaces" 516 : 2639-2644, 2008

      16 Jo, S. I., "Multi-Domain Alignment of Liquid Crystal Using a Stamp of Anisotropic Morphology Fabricated by a Directional Polymerization of Reactive Mesogen" 613 : 190-196, 2015

      17 Lee, K. -W., "Microscopic Molecular Reorientation of Alignment Layer Polymer Surfaces Induced by Rubbing and Its Effects on LC Pretilt Angles" 29 : 8894-8899, 1996

      18 Tong, F., "Mesogen-copolymerized Transparent Polyimide as a Liquid-Crystal Alignment Layer with Enhanced Anchoring Energy" 8 : 11119-11126, 2018

      19 Zhang, B., "Liquid Crystal Orientation Transition on Microtextured Substrates" 91 : 215501-, 2003

      20 안홍준 ; 백상현 ; 안종수 ; 박경철 ; 노재규 ; 유동연, "LCD 제조용 러빙포 물성에 따른 러빙된 폴리이미드 배향막의 특성 및 러빙효과 분석" 한국고분자학회 35 (35): 385-389, 2011

      21 Rapini, A., "Distorsion d'une Lamelle Nématique sous Champ Magnétique Conditions D'ancrage aux Parois" 30 : C4-54-C4-56, 1969

      22 Kim, Y., "Dependence of Planar Alignment Layer upon Enhancement of Azimuthal Anchoring Energy by Reactive Mesogens" 54 : 011701-, 2021

      23 Lee, F. K., "Continuous Liquid Crystal Pretilt Control through Textured Substrates" 85 : 5556-5558, 2004

      24 Seki, T., "Command Surfaces of Langmuir-Blodgett Films. Photoregulations of Liquid Crystal Alignment by Molecularly Tailored Surface Azobenzene Layers" 9 : 211-218, 1993

      25 이혜기 ; 김서영 ; 최이준, "Bending Behaviors in Photoresponsive Liquid Crystalline Polymer Films Derived from a Hockey Stick-Shaped Reactive Mesogen" 한국고분자학회 30 (30): 799-810, 2022

      26 Nie, X., "Anchoring Energy and Cell Gap Effects on Liquid Crystal Response Time" 101 : 103110-, 2007

      27 Lee, J. M., "Achieving a Robust Homogenously Aligned Liquid Crystal Layer with Reactive Mesogen for In-plane Switching Liquid Crystal Displays" 44 : 1194-1200, 2017

      28 Myrvold, B. O., "A Population Distribution Model for the Alignment of Nematic Liquid Crystals" 17 : 437-455, 1994

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