丙三醇水溶液中2个α弛豫的共存

Coexistence of two α relaxations in glycerol aqueous solution

本文通过介电谱和差示扫描量热法(DSC)对系列浓度的丙三醇水溶液进行了研究.介电谱结果表明浓度为58%和56%的丙三醇水溶液中存在着2个α弛豫过程,明显不同于传统上对丙三醇水溶液的认知.微观相分离理论对介电谱中的2个α弛豫共存以及DSC上的变化特征进行的分析表明,丙三醇水溶液中存在着丙三醇浓度分别低于和高于平均浓度的微观区域,并且在丙三醇浓度低于平均浓度的区域中心,丙三醇浓度不随平均浓度的变化而改变.本文的研究将促进对丙三醇水溶液的进一步认知,同时也为其应用和进一步研究提供基础.

Dielectric spectroscopy and DSC methods were used to study a series of concentrations of glycerol aqueous solutions and the results of dielectric spectroscopy show that there are two α relaxation processes in glycerol aqueous solutions with the concentrations of 58% and 56%, obviously different from the traditional understanding of glycerol aqueous solution. Then the coexistence of two α relaxations and DSC variations are analyzed and rationalized by the view of microscopic phase separation. The analysis results show that there are the microcosmic regions where the concentration of glycerol is lower than or higher than the average one respectively, and in the center of the former region, the concentration of glycerol does not vary with the change of the average one. The studies in this paper will promote the further understanding of glycerol aqueous solution and provide a basis for its applications and further researches.