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Reference type: Journal
Authors: Melde BJ, Johnson BJ, Dinderman MA, Deschamps JR
Article Title: Macroporous periodic mesoporous organosilicas with diethylbenzene bridging groups.
Publication date: 2010
Journal: Microporous And Mesoporous Materials
Volume: 130
Issue: (1-3)
Page numbers: 180-188.
DOI: 10.1016/j.micromeso.2009.11.003
Alternative URL: http://www.sciencedirect.com/science/article/B6TH4-4XNF48B-2/2/5d4e4b868ce10424588c4f825bf7f883

Abstract: Periodic mesoporous organosilicas (PMOs) with diethylbenzene bridging groups (DEB) in the pore walls are promising adsorbents for harmful compounds including nitroenergetics. The hierarchical macropore-mesopore structures developed here are expected to facilitate diffusion for such applications and to offer the potential for application in column formats. DEB-functionalized PMOs were synthesized with triblock copolymer Pluronic«P123 and the swelling additive mesitylene. Many of the materials were prepared through co-condensation of the DEB precursor bis(trimethoxysilylethyl)benzene with 1,2-bis(trimethoxysilyl)ethane (BTE) to improve mesostructure. Conditions were optimized to form micron-scale macropores by polymerization-induced phase separation. PMOs were also produced using only the DEB precursor. These materials exhibited relatively high surface areas (ca. 400ám2/g) and mesopore sizes (ca. 45á+) as well as isolated macropores. As-synthesized materials were fabricated as centimeter-scale monoliths that became powders after multiple solvent refluxes. Soxhlet extraction could be used to preserve monolithic morphology while removing enough P123 to access mesopores. Nitrogen sorption, powder X-ray diffraction, SEM, TEM, and TGA were applied to characterize the PMOs
Author keywords: Macroporous monolith, Periodic mesoporous organosilica, Bis(trimethoxysilylethyl)benzene, Hierarchical material, Polymerization-induced phase separation

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