Исследование физических состояний бинарных систем вода—оксиэтилированный глицерин со степенью полимеризации n = 5 и 25 при температурах ниже 273 К методом криомикроскопии

Животова, Е. Н.; Кулешова, Л. Г.; Зинченко, А. В.; Чеканова, В. В.

Binary systems water - oxyethylated glycerol (OEG) with the polymerization degree n = 5 and 25 have been investigated by optical cryomicroscopy within the temperature range 173 - 273 K at a cooling rate of 30 K <$E roman min sup -1> and a warming rate of 5 K <$E roman min sup -1>. Cryomicrographs demonstrating the morphology of the crystalline and/or amorphous phases at different contents of OEG depending on temperature on cooling or warming are given. It has been shown that the systems with low (0 - 45 %) and medium (46 - 72 %) contents of OEG (n = 5) crystallize, and the high OEG (n = 5)-content systems (73 - 100 %) remain wholly amorphous. A similar situation is observed for the system water - OEG (n = 25) with insignificant differences in the concentration ranges. The fundamental distinction between the two systems consists in that the system water - OEG (n = 25) of the high OEG (n = 25) concentration (more than 77 %) forms an ordered structure in contrast to the system water - OEG (n = 5).


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