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化学学报
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化学学报 ›› 1990, Vol. 48 ›› Issue (11): 1043-1048.    下一篇

研究论文

α-氨基-α-甲基,1,3-丙二醇从280K到其熔点间的热容和相变

张志英;杨孟林   

  1. 西北大学热化学研究室
  • 发布日期:1990-11-15

Heat capacity and phase transition of α-amino-α-methyl-3-propanediol from 280K to its melting point

ZHANG ZHIYING;YANG MENGLIN   

  • Published:1990-11-15

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本文用绝热量热计测量了α-氨基-α-甲基-1,3丙二醇从280K到其熔点间的热容和相变, 首次发现该物质在352,89和353,72K处有一个双叉型固-固相变, 并准确测定其熔点为384,08k。双叉型固-固相变和固液相变的相变焓经测定分别为(23,46±0.29)和(2.78±0.05)KJ,mol^-^1提出了"比例分配法", 用以解释两个相变温度极其接运的一级相变的相变焓, 并据此估算组成双叉型相变的两个固-固相变的相变焓分别为(5.00±0.75)和18.46±0.75)KJ,mol-1, 讨论了形成双叉型固一固相变的原因。

关键词: 相变, 焓, 丙二醇 P, 量热法, 比热, 丁胺 P

The heat capacity of 2-amino-2-methyl-1 3-propanediol was measured from 280 K to its m.p. by means of an automated adiabatic calorimeter. A bifurcated solid-solid transition was found for the compound with the temps. of the max. occurring at 352.89 ?0.01 and 353.72 ?0.01 K. The total enthalpy of the bifurcated transition was determine to be 23.46 ?0.29 kJ/mol, and resolved into the enthalpies of the transitions were determine It may be assumed that there are O-H-O, N-H-O, O-H-N, and N-H-N H bondings in the mols. of 2-amino-2-methyl-1,3-propanediol. The difference in strength between O-H...O and N-H-N bond is considered to be a reasonable explanation of the bifurcated transition.

Key words: PHASE TRANSFORMATION, ENTHALPY, PROPANEDIOL P, CALORIMETRY, SPECIFIC HEAT, BUTANAMINE P

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