Experimental Study on Solid-Liquid and Liquid-Liquid Phase Equilibria under High Pressure

高压固液及液液相平衡实验研究

• 批准号: 07650897
• 负责人: TANAKA Yoshiyuki
• 金额: $ 1.34万
• 依托单位: KOBE UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650897/
• 关键词: Benzene; Binary mixture; Cyclohexane; Hexadecane; High pressure; Liquid crystal; Phase equilibria; Tetradecane

The solid-liquid (SLE) and liquid-liquid (LLE) phase equilibria have been investigated experimentally for the following binary or ternary systems : 1) (Benzene, Cyclohexane + n-Ttetradecane, n-Hexadecane), 2) (Benzene + Cyclohexane + n-Tetradecane), 3) (MBBA (N-4-methoxybenzylidene-4'-n-butylaniline) + EBBA (N-4-ethoxybenzylidene-4'-n-butylaniline), 4) (MBBA,EBBA + Benzene, Cyclohexane) at temperatures from 230 to 363 K and pressures up to 120 MPa. The measurements of the phase transitions were performed using high pressure optical vessels designed for visual observation with the aid of a video microscope, and a three-terminal cylindrical capacitor designed for dielectric permittivity measurement. Concerning 1) and 2), the SLE diagrams of the investigated systems consist of two liquidus curves intersecting at a eutectic point. The solid-liquid coexistence curve and the eutectic point are found to increase to higher temperatures monotonically with increasing pressure in each system. The … More SLE diagrams at atmospheric pressure could be predicted successfully by the UNIF AC estimation method.Concerning the phase equilibria in binay liquid crystalline systems, the items 3) and 4), the crystal-nematic (T_<CN>) and nematic-isotropic (T_<NI>) transition temperatures were measured. A eutectic is found in the T_<CN> transition at a mole feaction of EBBA 0.2 and a temperature of 284 K in (MBBA + EBBA) system at atmospheric pressure. The T_<NI> transition temperatures are linear with respect to the composition of EBBA.Both transition temperatures T_<CN> and T_<NI> shift to higher temperature linearly with increasing pressure. In (MBBA,EBBA + Benzene, Cyclohexane) systems, the T_<CN> transition temperature decreases gradually with the concentration of isotropic components at atmospheric pressure. On the other hand, T_<NI> decreases remarkably with the addition of isotropic component up to 0.3-0.4 mole fraction. Addition of nonpolar isotropic component may give rise to serious effect to the packing of molecules and molecular interaction in the liquid crystals. Less

实验研究了以下二元或三元体系的固液（SLE）和液液（LLE）相平衡：1)（苯，环己烷+正十四烷，正十六烷），2)（苯+环己烷+正十四烷），3)(MBBA （n- 4-甲氧基苄基-4′-正丁苯胺）+ EBBA （n- 4-乙氧基苄基-4′-正丁苯胺），4)（MBBA，EBBA +苯，环己烷），温度为230 ~ 363 K，压力为120 MPa。在高压光学容器和三端圆柱电容的辅助下进行了相变测量。关于1)和2)，所研究的体系的SLE图由两条在共晶点相交的液相曲线组成。固液共存曲线和共晶点随各体系压力的增加而单调升高。用UNIF AC估计方法可以成功地预测大气压下的更多SLE图。对于二元液晶体系的相平衡，测量了第3)项和第4项、晶体向列相（T_<CN>）和向列各向同性（T_<NI>）转变温度。在大气压下（MBBA + EBBA）体系中，在EBBA 0.2的摩尔反应和284 K的温度下，发现了T_<CN>相变共晶。T_<NI>的转变温度与EBBA的组成呈线性关系。转变温度T_<CN>和T_<NI>均随压力升高而线性升高。在（MBBA、EBBA +苯、环己烷）体系中，随着各向同性组分浓度的增加，T_<CN>转变温度逐渐降低。当各向同性组分的加入达到0.3 ~ 0.4摩尔分数时，T_<NI>显著降低。非极性各向同性组分的加入会对液晶中分子的堆积和分子间的相互作用产生严重的影响。少

项目成果

T.Tanaka et al.: "Phase Equilibria in Binary Liquid crystalline Systems under High Pressure" Proc.Joint AIRAPT-16 & HPCJ-38 Int.Conf.on High Pressure Seience and Technology Aug.25-29,Kyoto. (1997)

T.Tanaka 等人：“高压下二元液晶系统中的相平衡”Proc.Joint AIRAPT-16

T.Tanaka,M.Kawakami: "Solid-Liquid Phase Equilibria in Binary (Benzene,Cyclohexane + n-Tetradecane,n-Hexadecane) and Ternary (Benzene + Cyclohexane + n-Tetradecane) System at Temperatures 230-323 K and Pressures up to 120 MPa" Proc.the Fourth Asian Thermo

T.Tanaka,M.Kawakami：“二元（苯、环己烷正十四烷、正十六烷）和三元（苯环己烷正十四烷）系统在温度 230-323 K 和压力高达 120 MPa 时的固液相平衡

T.Tanaka,M.Kawakami: "Solid-Liquid Phase Equilibria in Binary (Benzene,Cyclohexane + n-Tetradecanen-Hexadecane) Systems at Temperature 230-323 K and Pressures up to 120 MPa" Fluid Phase Equilibria. 125. 103-114 (1996)

T.Tanaka、M.Kawakami：“二元（苯、环己烷正十四烷-十六烷）系统在温度 230-323 K 和压力高达 120 MPa 时的固液相平衡”流体相平衡。

Y.Tanaka et al.: ""Solid-Liquid Phase Equilibria in (Benzene + Cyclohexane + n-Tetradecane) System under High Pressures"" Submitted to Fluid Phase Equilibria. (1997)

Y.Tanaka 等人：“高压下（苯环己烷正十四烷）系统中的固液相平衡”提交至液相平衡。

Y. Tanaka, M. Kawakami: "Solid-Liquid Phase Equilibria in Binary (benzene, Cyclohexane + n-Tetradecane, n-Hexadecane) and Ternary (Benzene + Cyclohexane + n-Tetradecane) Systems at Temperatures 230-323 K and Pressures up to 120 MPa" Proc. 4th Asian Thermo

Y. Tanaka、M. Kawakami：“二元（苯、环己烷正十四烷、正十六烷）和三元（苯环己烷正十四烷）系统在温度 230-323 K 和压力高达 120 MPa 下的固液相平衡