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

作　　者：GUO Bin GAO Jian-gang CHEN Da-zhu LIU Jian-ping HE Ping-sheng ZHANG Qi-jin 

机构地区：[1]Structure Research Laboratory,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

出　　处：《Chemical Research in Chinese Universities》2005年第5期606-610,共5页高等学校化学研究（英文版）

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

摘　　要：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 Ea 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.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 Ea 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.

关 键 词：Sol-gel transition ORGANIC/INORGANIC Hybrid material DTVM 

分 类 号：O623.71[理学—有机化学] O642[理学—化学]