中华医学超声杂志

应用化学 ›› 1994, Vol. 0 ›› Issue (2): 89-92.

• 研究论文 • 上一篇    下一篇

长链烷基胺氢卤酸盐的热致相变

王玮, 李来明, 席时权   

  1. 中国科学院长春应用化学研究所 长春 130022
  • 收稿日期:1993-04-28 修回日期:1993-09-27 出版日期:1994-04-10 发布日期:1994-04-10

Thermotropic Phase Transition of n-Alkylammonium Halides

Wang Wei, Li Laiming, Xi Shiquan   

  1. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022
  • Received:1993-04-28 Revised:1993-09-27 Published:1994-04-10 Online:1994-04-10

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摘要： 差示扫描量热法(DSC)结果表明,烷基胺氢卤酸盐化合物的相变温度与化合物烷基链链长之间存在明显的规律性,固-固结构相变的主相变峰温随烷基链链长的递增而升高,其逆相变过程表现出明显的热滞后现象;而熔融相变温度则随烷基链链长的递增而降低;实验结果还表明,试样的陈化放置过程以及结晶过程中所用的溶剂对化合物的热致相变历程都有明显的影响。

关键词: 烷基胺氢卤酸盐, 热致相变, 差示扫描量热法

Abstract: The thermotropic phase transition of a series of long-chain n-alkylammonium halides (CnH2n+1NH3X,n=8～18,X=Cl, Br)has been studied by differential scanning calorimetry.2 The results show that the main transition temperature of solid-solid structural phase transitions is proportional to the length of hydrocarbon chain. The reverse transitions of the structural transitions exhibit variously hysteresis effect. The melting temperatures decrease linearly with the increase of hydrocarbon chain length. The results suggest that the process of phase transition is relative to the aging and crystallization course of the crystalline samples.

Key words: n-alkylammonium halide, phase transition, differential scanning calorimetry

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