The synthesis of ordered mesoporous silicas and organosilicas templated by Pluronic block copolymers is typically performed under quite strongly acidic conditions (for instance, 0.5-2 M aqueous HCl). It was recently recognized that lower acidity (~0.1 M HCl) offers unique opportunities in generating periodic mesoporous organosilicas (PMOs) with hybrid inorganic-organic frameworks and with spherical mesopores of high volume and large size. Highly ordered face-centered-cubic phenylene-bridged and ethenylene-bridged PMOs templated by Pluronic F127 surfactant were successfully obtained with large unit-cell sizes, appreciable ordered mesopore volumes, and large pore diameters. The pore size tailoring has been explored for these PMOs. The synthesis of face-centered cubic ethylene-bridged PMOs with large pore volumes, which was reported earlier by others, was adapted to the use of a more cost effective and convenient framework precursor. Other organosilicas were also obtained under these conditions. The opportunities in the adjustment of the pore accessibility have been explored.

Synthesis of periodic mesoporous organosilicas and silicas under moderately acidic conditions

248th National Meeting (2014)

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