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首页> 外文期刊>Journal of Chemical and Engineering Data: the ACS Journal for Data >Combined Thermogravimetric Determination of Activity Coefficients and Binary Diffusion Coefficients-A New Approach Applied to Ferrocene/n-Tetracosane Mixtures
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Combined Thermogravimetric Determination of Activity Coefficients and Binary Diffusion Coefficients-A New Approach Applied to Ferrocene/n-Tetracosane Mixtures

机译：相结合的热重测定活性系数和二元扩散系数 - 一种施加到铁茂/ N-四胞外烷混合物的新方法

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摘要

The use of isothermal thermogravimetry is investigated for combined measurements of activity coefficients and diffusion coefficients in binary mixtures, where the vapor pressure is dominated by one compound. The coupling of evaporation with gas phase and condensed phase diffusion leads to an unsteady mass loss, which depends on the activity coefficient and both, gas phase and condensed phase, diffusion coefficients, as is explained. This can be used to measure two of these properties, if the remaining parameters are known. This concept is evaluated for the ferrocene/n-tetracosane system. The former is a flame-retardant, and the latter was regarded as a substitute for a polymer, with simpler behavior. Between 341 and 399 K, the activity coefficient for ferrocene is measured to drop from above 3 to values near 1, while the diffusion coefficients are weakly temperature dependent, with values around 2 x 10(-9)/m(2)s(-1). In addition, the vapor pressures of the two pure substances were re-evaluated for this temperature range. This relatively simple method seems to be useful for the determination of such properties of other flame-retardant-related systems.
机译：研究了等温热重测定的使用，用于组合在二元混合物中的活性系数和扩散系数的测量，其中蒸汽压力由一种化合物支配。与气相和冷凝相扩散的蒸发偶联导致不稳定的质量损失，这取决于活动系数和兼容，气相和凝聚相，扩散系数，如解释。如果剩余的参数是已知的，则这可以用于测量这些属性中的两个。该概念是针对二茂茂/ N-四骨烷系统评价的。前者是阻燃剂，后者被认为是聚合物的替代品，具有更简单的行为。在341和399 k之间，测量二茂茂的活性系数以从上方3滴到1附近的值，而扩散系数依赖于弱温，值约为2×10（-9）/ m（2）S（ - 1）。另外，对该温度范围重新评估两个纯物质的蒸汽压力。这种相对简单的方法似乎可用于确定其他与阻燃相关系统的这种性质。

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