Acta Phys. -Chim. Sin. ›› 1999, Vol. 15 ›› Issue (06): 517-521.doi: 10.3866/PKU.WHXB19990607

• ARTICLE • Previous Articles     Next Articles

Themal Physical Chemical Characteristics of SiO2-PEG Xerogels

Sun Ji-Hong, Gong Yan-Jun, Fan Wen-Hao, Wu Dong, Sun Yu-Han   

  1. State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001
  • Received:1998-08-31 Revised:1998-12-18 Published:1999-06-15
  • Contact: Sun Yu-Han

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Abstract:

 The thermal behavior of SiO2-PEG/SiO2 xerogels was analyzed by using a temperature-programmed thermogravimertric method. The results showed the PEG in the xerogel had different thermal stability when the SiO2-PEG xerogel being heated under different atmosphere, and therefore influenced the textural properties. The apparent activation energy in different temperature stages was obtained from the DTG curves in N2. It indicated that the dehydroxyl reaction of SiO2 xerogel was kinetic-controlled, but, undergone the transition from kinetic-controll to diffusion-controll of the surface hydroxyl gradually with increasing temperature.

Key words: TG-DTA, SiO2-PEG, PEG(Polyethylene glycol), SiO2 xerogel