聚合度n = 30的乙氧基化甘油水溶液在低于283 K温度下的物理状态。

Physical states of aqueous solutions of oxyethylated glycerol with polymerization degree of n=30 at temperatures lower than 283 K.

作者信息

Zhivotova Elena N, Zinchenko Alexandra V, Kuleshova Larisa G, Chekanova Valentina V, Kompaniets Antonia M

机构信息

National University of Pharmacy, Kharkov,Ukraine.

出版信息

Cryo Letters. 2007 Jul-Aug;28(4):261-70.

PMID:17962830

Abstract

A binary system water-oxyethylated glycerol with polymerization degree of n=30 (OEGn=30) is studied over the concentration range of 0-100% (w/w) and the temperature range of 123-283 K by differential scanning calorimetry (DSC). A phase diagram of this system is constructed at the average cooling rate of 200 K-1 per min and the warming rate of 0.5 K-1 per min. Ice crystallization occurs and 70% (w/w) unfrozen residues remain during cooling in the OEGn=30 concentration range of 0-45% (w/w). The system hardens in the amorphous state during cooling and ice crystallization occurs during warming in the range of 46-62% (w/w). Crystallization is observed neither during the cooling nor the subsequent warming in the range of 63-74% (w/w). OEGn=30 crystallization occurs in the range of 75-100% (w/w). Each OEGn=30 molecule can strongly bind to 48 water molecules. In parallel with dsc study, the water-OEGn=30 system is investigated by cryomicroscopy in the temperature range of 173-283 K. Cryomicrographs of the solidified solutions representing each of the four concentration bands mentioned above are given.

摘要

通过差示扫描量热法（DSC）研究了聚合度n = 30（OEGn = 30）的二元水 - 氧乙基化甘油体系，其浓度范围为0 - 100%（w/w），温度范围为123 - 283 K。该体系的相图是在平均冷却速率为每分钟200 K⁻¹和升温速率为0.5 K⁻¹的条件下构建的。在OEGn = 30浓度范围为0 - 45%（w/w）的冷却过程中会发生冰结晶，且有70%（w/w）的未冻结残余物。该体系在冷却过程中以非晶态硬化，在46 - 62%（w/w）范围内升温时会发生冰结晶。在63 - 74%（w/w）范围内，无论是冷却过程还是随后的升温过程中均未观察到结晶现象。OEGn = 30的结晶发生在75 - 100%（w/w）范围内。每个OEGn = 30分子能与48个水分子强烈结合。与DSC研究并行，在173 - 283 K的温度范围内通过低温显微镜对水 - OEGn = 30体系进行了研究。给出了代表上述四个浓度区间的凝固溶液的低温显微镜照片。