2,2-二羟甲基-1,3-丙二醇在275-510 K间的热容和相变

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。

HEAT CAPACITY AND PHASE TRANSITION OF 2,2-BISHYDROXYMETHYL-1, 3-PROPANEDIOL BETWEEN 275 AND 510 K

The heat capacity of 2,2-bishydroxymethyl-1,3-propanediol was measured over the temperature range 275 to 510 K by means of an automated adiabatic calorimeter. A solid-solid phase transition was found at 416.60 K. The enthalpy and entropy of the transition were determined to be 41.37 kJ tool~(-1) and 89.62 J K~(-1) mol~(-1) respectively. Using the enthalpy of the transition, the destroyed average hydrogen bond energy of the compound was deduced to be 9.69 kJ mol~(-1).