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许多多元醇在270-500K间具有相变焓很大的固-固相变,是一类潜在的固-固相变低温储能物质。2,2-二羟甲基-1,3-丙二醇是一种重要的多元醇,除在化工方面有广泛的应用外,在低温储能方面也有相当乐观的开发前景。它的有关热性质虽已有一些DSC研究报道,但数据精度较差并缺乏系统性。作为系统研究多元醇及其固体溶液热力学性质工作的一部份,本文将报道2,2-二羟甲基-1,3-丙二醇在275—500K间的热容和相变,并根据所测其固-固相变焓数据讨论该物质被破坏的平均氢键键能。
Many polyols have solid-solid phase transitions with great phase transition enthalpy between 270-500K, and are a kind of potential solid-solid phase transition materials. 2,2-dimethylol-1,3-propanediol is an important polyol, in addition to a wide range of chemical applications, the low temperature energy storage has a very optimistic development prospects. Although some DSC studies have been reported on its thermal properties, the accuracy of the data is poor and systematic. As part of a systematic study of the thermodynamic properties of polyols and their solid solutions, this paper reports the heat capacity and phase transition of 2,2-dimethylol-1,3-propanediol between 275 and 500 K, The solid-solid phase enthalpy data discuss the average hydrogen bond energy destroyed by this species.