Characterization of pore structure of copolymer-templated periodic mesoporous organosilicas
作者： Oksana Olkhovyk , Michal Kruk , Rebecca Sutton , Mietek Jaroniec
DOI: 10.1016/S0167-2991(05)80272-1
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摘要: The diameters of entrances to the large cage-like mesopores (7–10 nm) triblock-copolymer-templated periodic mesoporous organosilicas (PMOs) with ethylene (-CH 2 −CH -) bridging groups were determined on basis nitrogen and argon adsorption isotherms for unmodified organosilane-modified materials. polymers used PMO synthesis Pluronic P123 poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (EO 20 PO 70 EO ) B50-6600 oxide)-poly(butylene 39 BO 47 ). Hysteresis loops PMOs closed at lower limit adsorption-desorption hysteresis, thus indicating pore entrance diameter below 4 nm. pores templated triblock copolymer largely blocked after surface modification octyldimethylsilyl groups, suggesting size ≈2.9 by still exhibited accessible porosity latter which in combination results points between 2.9 4.0
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