Bifunctional periodic mesoporous organosilicas with thiophene and isocyanurate bridging groups.
Bifunctional periodic mesoporous organosilicas (BPMOs) with thiophene- and isocyanurate-bridging groups were prepared by one-pot co-condensation of 2,5-bis(triethoxysilyl)thiophene and tris[3-(trimethoxysilyl)propyl]isocyanurate precursors in the presence of a poly(ethylene oxide)-poly(DL-lactic acid-co-glycolic acid)-poly(ethylene oxide) (PEO-PLGA-PEO) triblock copolymer under acidic conditions. The resulting BPMOs exhibited 2D hexagonal ordering (p6mm), large mesopores of approximately 7.7 nm, and high BET surface area (approximately 600-700 m(2)/g). (13)C CP-MAS and (29)Si MAS NMR studies confirmed the presence of thiophene and isocyanurate bridging groups inside the framework of pore walls with the relative content reflecting the synthesis gel composition. Additional quantitative estimation was provided by N and S elemental analysis. Thermogravimetric analysis showed the thiophene-isocyanurate BPMOs are stable up to 250 degrees C in flowing air and up to 400 degrees C in flowing nitrogen.
Cho
Eun-Bum
EB
Department of Chemical Engineering, Polymer Technology Institute, Sungkyunkwan University, Suwon, Gyeonggi-do 440-746, Korea.
Kim
Dukjoon
D
Jaroniec
Mietek
M