物理化学学报 >> 1999, Vol. 15 >> Issue (09): 850-855.doi: 10.3866/PKU.WHXB19990915

研究简报 上一篇    下一篇

多元醇及其二元混合物固-固相变的IR研究

冯海燕, 刘晓地, 何书美, 武克忠, 张建玲   

  1. 河北师范大学化学系,河北师范大学实验中心,石家庄 050016
  • 收稿日期:1998-11-20 修回日期:1999-03-04 发布日期:1999-09-15
  • 通讯作者: 刘晓地

Studies on Solid-Solid Phase Transition of Polyols and their Binary Mixtures by Infrared Spectroscopy

Feng Hai-Yan, Liu Xiao-Di, He Shu-Mei, Wu Ke-Zhong, Zhang Jian-Ling   

  1. Department of Chemistry,Hebei Normal University,Shijiazhuang 050016
  • Received:1998-11-20 Revised:1999-03-04 Published:1999-09-15
  • Contact: Liu Xiao-Di

关键词: 多元醇, 固-固相变, 红外光谱, 氢键

Abstract:

 FT-infrared spectrometer was used to obtain a series of infrared spectra at various temperatures of pentaerythritol(PE)、pentaglycerine(PG)、neopentylglycol(NPG) and their binary mixtures. The shifts of -OH absorption peak reveal the solid-solid phase transition mechanisms and the connection of wave number shifts with temperature and enthalpies of phase transition. The solid-solid phase transitions of the three polyols and their binary mixtures are known to transform from a low symmetric layered crystal structure to a highly symmetric face centered cubic structure. Experimental results support a mechanism which involves reversible breaking of nearest neighbor hydrogen resonance bonds in the molecular crystals at the transformation temperature. Infrared spectra show reversible increase in the wave number of the absorption peak of -OH groups with reversible breaking of the hydrogen bonds. This is in agreement with the experimental results of X-ray diffraction and thermal analysis.

Key words: Polyols, Solid-solid phase transition, Infrared spectra, Hydrogen bonds