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首页> 外文期刊>Russian Journal of Physical Chemistry >Phase Diagram of an Ethylene Glycol-Hexamethylphosphorotriamide System
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Phase Diagram of an Ethylene Glycol-Hexamethylphosphorotriamide System

机译：乙二醇 - 六甲基磷磷酰胺系统的相图

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摘要

The phase diagram of an ethylene glycol ( EG) - hexamethylphosphorotriamide ( HMPT) system is studied over two wide temperature intervals (+ 25 degrees..- 90 degrees..+ 40 degrees.) and (- 150 degrees..+ 40 degrees.) by means of differential scanning calorimetry using INTERTECH DSC Q100 and METTLER TA4000 DSC instruments ( Switzerland) in the DSC30 mode with variable cooling/ heating rates. Substantial overcooling of the liquid phase, a glass transition, and different types of interaction are observed in the system. No thermal effects are observed in intermediate range of concentrations during the slow cooling/ heating processes, and the system remains liquid until the glass transition. The presence of such a metastable phase is attributed to a sharp rise in the viscosity of the system due to different kinds of interaction between the components. HMPT : 2EG and HMPT : EG compounds with crystallization temperatures of + 5 and - 0.5 degrees., respectively, are observed upon rapid cooling and slow heating. Changes in enthalpy are calculated for all of the observed thermal effects. The distinction from the phase diagram of H2O- HMFT ( literary data) is explained by the difference in the interactions between system components and by the structural differences between EG and H2O.
机译：在两个宽的温度间隔（+ 25度+ 40度，研究了乙二醇（例如） - 六甲基磷酰基磷酰胺（HMPT）系统的相图（+ 25度。 - 90度。）和（ - 150度。+ 40度。 ）通过使用Intertech DSC Q100和Mettler TA4000 DSC仪器（瑞士）在DSC30模式下的差分扫描量热法，具有可变冷却/加热速率。在系统中观察到液相，玻璃转变和不同类型的相互作用的大量过冷。在缓慢冷却/加热过程中，在浓度的中间浓度范围内没有观察热效应，并且系统保持液体直至玻璃化转变。由于部件之间的不同种类的相互作用，这种稳定相的存在归因于系统的粘度急剧上升。 HMPT：2EG和HMPT：例如，具有+ 5和-0.5度的结晶温度的化合物，分别观察到快速冷却和缓慢加热时。针对所有观察到的热效应计算焓的变化。通过系统组件之间的相互作用和例如，例如和H2O之间的结构差异来解释来自H2O-HMFT（文学数据）的相图的区别。

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