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原位合成的活性脲醛树脂作为模板剂制备二氧化硅介孔材料Synthesis
2006 64 Vol. 64, 2006
8 , 756760 ACTA CHIMICA SINICA No. 8, 756760
· ·
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( 200092)
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Synthesis of Mesoporous Silica Materials Using the Reactive
Urea-formaldehyde Resin Polymerized in situ as Template
GUO, Bin LIU, Hui HAO, Zhi-Xian* GAN, Li-Hua XU, Zi-Jie CHEN, Long-Wu
(Department of Chemistry, Tongji University, Shanghai 200092)
Abstract A simple one-step procedure was described for the synthesis of mesoporous monolith and
composite sphere, in which hydrolyzation of tetraethyl orthosilicate and polymerization of urea with
formaldehyde occurred at the same time. The analysis of the liquid nitrogen adsorption demonstrated that the
pore sizes of the monoliths and the composite spheres were both uniform. Morphologies of the composite
spheres characterized by SEM were smooth or of network, which depended on the relative concentrations of
the reactants. As the molar ratio of formaldehyde to urea exceeded the limit of 2.0, the synthesis by varying
initial concentration of the reactants yielded the monoliths with controllable pore sizes. From the analysis of
the FTIR and DTA, the urea-formaldehyde resin with branched chains in its molecular structure was
considered as an inducing agent in the pore formation of the monolith.
Keywords mesoporous silica; template; urea-formaldehyde resin; composite powder; monolith
.
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