首页> 外文期刊>Revue roumaine de chimie >GAS CHROMATOGRAPHIC STUDIES USING GLASS CAPILLARY COLUMNS WITH NAPHTYL-AZOBENZO-CROWN ETHERS AND RELATED COMPOUNDS AS STATIONARY PHASES.2: THERMAL BEHAVIOUR AND DISTRIBUTION MECHANISMS
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GAS CHROMATOGRAPHIC STUDIES USING GLASS CAPILLARY COLUMNS WITH NAPHTYL-AZOBENZO-CROWN ETHERS AND RELATED COMPOUNDS AS STATIONARY PHASES.2: THERMAL BEHAVIOUR AND DISTRIBUTION MECHANISMS

机译:使用萘基-氮杂苯并冠醚和相关化合物作为固定相的玻璃毛细管色谱柱进行气相色谱研究。2:热行为和分布机理

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摘要

The thermal behaviour regarding the phase transitions of two naphtyl-azobenzo-crown ethers and three related compounds was studied by differential scanning calorimetry and gas chromatography. A hystheresis phenomenon was noted. The free energy, enthalpy and entropy of sorption for n-decane and n-decanol in the solid and supercooled liquid states were determined comparatively for the five compounds and OV-25 as stationary phases. Mixed adsorption and sorption in bulk phenomena were recognised for some of them as solid. The hydroxyl and methylene increments of the sorption free energy were evaluated. The contributions of the free energy and phase ratio changes to the retention shift at the solid-liquid transition were delimited.
机译:通过差示扫描量热法和气相色谱法研究了两种萘基-偶氮苯并冠状醚和三种相关化合物的相变热行为。注意到一个hysheresis现象。比较确定了五种化合物和OV-25作为固定相时在固态和过冷液相中正癸烷和正癸醇的吸附自由能,焓和熵。混合吸附和大量吸附现象被认为是其中的一些固体。评估了吸附自由能的羟基和亚甲基增量。划定了自由能和相比变化对固液转变时保留位移的贡献。

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