引用本文:
孙继红, 巩雁军, 范文浩, 吴东, 孙予罕. SiO2-PEG凝胶体系的热物理化学特征[J]. 物理化学学报,
1999, 15(06): 517-521.
doi:
10.3866/PKU.WHXB19990607
Citation: Sun Ji-Hong, ng Yan-Jun, Fan Wen-Hao, Wu Dong, Sun Yu-Han. Themal Physical Chemical Characteristics of SiO2-PEG Xerogels[J]. Acta Physico-Chimica Sinica, 1999, 15(06): 517-521. doi: 10.3866/PKU.WHXB19990607
Citation: Sun Ji-Hong, ng Yan-Jun, Fan Wen-Hao, Wu Dong, Sun Yu-Han. Themal Physical Chemical Characteristics of SiO2-PEG Xerogels[J]. Acta Physico-Chimica Sinica, 1999, 15(06): 517-521. doi: 10.3866/PKU.WHXB19990607
SiO2-PEG凝胶体系的热物理化学特征
English
Themal Physical Chemical Characteristics of SiO2-PEG Xerogels
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, under ne the transition from kinetic-controll to diffusion-controll of the surface hydroxyl gradually with increasing temperature.
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Key words:
-
TG-DTA
- / SiO2-PEG
- / PEG(Polyethylene glycol)
- / SiO2 xerogel
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