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Mechanism of polyalcohol solid—solid phase change

Wang Xiao-Wu Xu Hai-Hong

Mechanism of polyalcohol solid—solid phase change

Wang Xiao-Wu, Xu Hai-Hong
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  • Abstract views:  4286
  • PDF Downloads:  716
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Publishing process
  • Received Date:  29 May 2010
  • Accepted Date:  24 June 2010
  • Published Online:  15 March 2011

Mechanism of polyalcohol solid—solid phase change

  • 1. Applied Physics Department, South China University of Technology, Guangzhou 510640, China

Abstract: Many polyalcohols will change from one crystal structure to another at certain temperatures. A lot of works had reported their phase change enthalpy, phase change temperature and phase diagram. It is taken that their phase change enthalpy must be related to their hydrogen bond. This article investigated quantitatively the relation between phase change enthalpy and hydrogen bond of NPG (neopentylglycol), PG (pentaglycerino) and PE (pentaerythritol) on the basis of infrared spectrum experimental data and calorimetric results. It was shown that before phase change, all the —OH are associated and as a result NPG, PG and PE form layer structure. After phase change, NPG, PG and PE move along the layer and as a result some hadrogen bonds break. Therefore the phase change enthalpy equals the energy used to break hydrogen plus the energy used to increase the vibration frequency of other still associated —OH.

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