CRCU

Chemical Research in Chinese Universities ›› 2005, Vol. 21 ›› Issue (5): 606-610.

• Articles • Previous Articles     Next Articles

A New Method to Study the Sol-gel Transition Process of Organic/Inorganic Hybrid Materials

GUO Bin1,2, GAO Jian-gang2, CHEN Da-zhu2, LIU Jian-ping2, HE Ping-sheng2, ZHANG Qi-jin2   

  1. 1. Structure Research Laboratory;Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China;
    2. Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China
  • Received:2004-10-11 Online:2005-09-23 Published:2011-08-06
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.50025309 and 90201016).

Cited

2

Abstract: The sol-gel transition process of PMMA/SiO2 hybrid materials was first studied by means of the dynamic torsional vibration method. The different stages of the transition can be described by the change of torque. The temperature-dependent measurement of the gel time(tg) gives the possibility to determine the apparent activation energy(Ea) of this transition according to Flory′s gelation theory. The non-equilibrium thermodynamic fluctuation theory was used to predict the transition behavior. The isothermal transition experiments on hybrid sols with different TEOS(tetraethyl orthosilicate) contents were carried out. The results show that the a of a hybrid sol is higher than that of a non- hybrid sol of a TEOS-water-ethanol system. The increasing of TEOS content in a hybrid sol has no obvious effect on the Ea value, but it can enhance the sol-gel reaction rate.

Key words: Sol-gel transition, Organic/inorganic, Hybrid material, DTVM