Journal Title
Title of Journal: Adsorption
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Authors: Liang Cao Hongchen Dong Liang Huang Krzysztof Matyjaszewski Michal Kruk
Publish Date: 2009/03/21
Volume: 15, Issue: 2, Pages: 156-166
Abstract
Polyethylene oxidepolymethyl acrylate diblock copolymers with narrow molecular weight distributions were synthesized using atom transfer radical polymerization The copolymers were used as micellar templates for the synthesis of mesoporous silicas The products were characterized using smallangle Xray scattering transmission electron microscopy TEM and nitrogen adsorption The obtained silicas exhibited twodimensional hexagonal structures of cylindrical mesopores and thus can be classified as SBA15 silicas In some cases the size of ordered domains was very small The 100 interplanar spacings were 13–17 nm depending on the size of the diblock copolymer used and on the synthesis conditions Nitrogen adsorption showed that the silicas exhibited specific surface areas of 350–800 m2 g−1 pore volumes ∼1 cm3 g−1 and narrow pore size distributions The BJH nominal pore diameters were up to ∼20 nm but actual diameters of cylindrical pores are expected to be somewhat smaller In many cases the mesopores exhibited constrictions
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