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HWAHAK KONGHAK,
Vol.26, No.5, 546-552, 1988
Vol.26, No.5, 546-552, 1988
4'-Ethoxybenzylidene-4-n-Butylaniline과 4-(n-Butyl)-trans-Cyclohexane Carboxylic Acid Cyanophenol Ester의 이성분계 네마틱액정의 상거동
Phase Behavior of Binary Nematic Liquid Crystal Mixtures of 4'-Ethoxybenzylidene-4-n-Butylaniline and 4-(n-Butyl)-trans-Cyclohexane Carboxylic Acid Cyanophenol Ester
4'-ethoxybenzylidene-4-n-butylaniline（EBBA）과 4-(n-butyl)-trans-cyclohexane carboxylic acid cyanophenol ester의 이성분 혼합액정의 상거동을 결정-액정상, 액정상-등방성 용액 상전이 온도를 측정하여 상태도를 구하고 액정상의 구조적 특성을 관찰하였다. 순수성분은 네마틱 여역을 갖고 있으며 편광현미경하에서 Schlieren형의 특징을 보여 주었으며 혼합물은 공융점(eutectic point)을 보여주었다. Azoxy형 PAA와 Schiff-base형 EBBA는 단순 공융점을 갖고 있으나 EBBA와 ester계는 공융점 근처, 25-43 mole%에서 네마틱을 갖고 있으며 저온도에서 스멕틱(Smectic)상의 부채살 모양의 특징을 나타내고 있다.
The phase behavior of binary mixtures of 4'-ethoxybenzylidene-4-n-butylaniline
（EBBA） and 4-(n-butyl)-trans-cyclohexane carboxylic acid cyanophenol ester was investigated by determining the transition temperatures of crystal to mesophase and mesophase to isotropic phase and by observing the optical textures of liquid crystalline phases. In the textures of pure compounds, all exhibited well-developed nematic phases having Schlieren patterns and the eutactic behavior of transition from crystal to nematic phase. The mixtures of azoxy group (p-azoxyanisole) and Schiff-base material(EBBA) have a simple eutectic behavior, while the mixtures of EBBA and ester showed mixed polymorphism near the eutectic compositions, including smetic, a fan-shaped texture, and nematic at 25-43 mole %.
（EBBA） and 4-(n-butyl)-trans-cyclohexane carboxylic acid cyanophenol ester was investigated by determining the transition temperatures of crystal to mesophase and mesophase to isotropic phase and by observing the optical textures of liquid crystalline phases. In the textures of pure compounds, all exhibited well-developed nematic phases having Schlieren patterns and the eutactic behavior of transition from crystal to nematic phase. The mixtures of azoxy group (p-azoxyanisole) and Schiff-base material(EBBA) have a simple eutectic behavior, while the mixtures of EBBA and ester showed mixed polymorphism near the eutectic compositions, including smetic, a fan-shaped texture, and nematic at 25-43 mole %.
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