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

Abstract

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 min–1 and a warming rate of 5 K min–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).