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首页> 外文期刊>Journal of the Indian Chemical Society >Effect of temperature and solvents on ultrasonic velocity and thermodynamic parameters of cyclohexane-1,1-diylbis(2-methyl-4,1-phenylene)dibenzoate solutions
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Effect of temperature and solvents on ultrasonic velocity and thermodynamic parameters of cyclohexane-1,1-diylbis(2-methyl-4,1-phenylene)dibenzoate solutions

机译:温度和溶剂对环己烷-1,1-二基双(2-甲基-4,1-亚苯基)二苯甲酸酯溶液超声速度和热力学参数的影响

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摘要

The present work describes physico-chemical parameters of cyclohexane-1,1-diylbis(2-methyl-4,1-phenylene)dibenzoate (MBCBZ). The density (p), viscosity (TI) and ultrasonic speed (U) of pure solvents : 1,4-dioxane (DO), chloroform (CF), ethyl acetate (EA), tetrahydrofuran.(THF) and MBCBZ solutions of different concentrations were investigated at four different temperatures : 298, 303, 308 and 313 K to understand the effect of solvents on molecular interactions. Various acoustical and thermodynamic parameters such as ultrasonic speed (U), adiabatic compressibility (kappa(s)), Rao's molar sound function (R-m), specific acoustical impedance (Z), van der Waals constant (b), internal pressure (pi), viscous relaxation time (tau), free volume (V-f), intermoleoular free path length (L-f) and classical absorption coefficient (alpha/f(2))(cl) have been determined and correlated with concentration (C). A fairly good to excellent correlation between a given parameter and concentration is observed. Studied aeoustical and thermodynamic parameters indicated existence of strong molecular interactions in the solutions. Gibb's free energy of activation (Delta G*) is found to be both concentration and temperature dependent. Both enthalpy of activation (Delta H*) and entropy of activation (Delta S*) are found to be concentration dependent.
机译:本工作描述了环己烷-1,1-二基双(2-甲基-4,1-亚苯基)二苯甲酸酯(MBCBZ)的理化参数。纯溶剂的密度(p),粘度(TI)和超声速度(U):不同溶剂的1,4-二恶烷(DO),氯仿(CF),乙酸乙酯(EA),四氢呋喃(THF)和MBCBZ溶液在四个不同的温度下(298、303、308和313 K)研究了三聚氰胺的浓度,以了解溶剂对分子相互作用的影响。各种声学和热力学参数,例如超声速度(U),绝热压缩率(kappa),Rao摩尔摩尔声函数(Rm),比声阻抗(Z),范德华常数(b),内压(pi) ,确定了粘性弛豫时间(tau),自由体积(Vf),分子间自由路径长度(Lf)和经典吸收系数(alpha / f(2))(cl)并与浓度(C)相关。在给定参数和浓度之间观察到相当好的相关关系。研究的声学和热力学参数表明溶液中存在强分子相互作用。发现吉布的活化自由能(Delta G *)与浓度和温度有关。发现活化焓(ΔH*)和活化熵(ΔS*)均与浓度有关。

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