Preparation of Silicon-containing Hybrid Porous Materials by Piers-Rubinsztajn Reaction
Organic-inorganic hybrid porous polymers not only exhibit the diversity of synthesis and flexibility in pore performance control as that of organic porous materials,but also show excellent thermal stability and mechanical properties of inorganic porous materials,and thus play a very important role in the field of porous materials.Polyhedral oligomeric silsesquioxane(POSS)has highly symmetrical structure,is easy to be chemically modified,and has excellent thermal and chemical stability.The silicon oxygen connection at the center of POSS is identical to the Si—O—Si double quaternary ring structure in molecular sieves,making POSS an ideal building block for hybrid porous materials.The Piers-Rubinsztajn reaction catalyzed by B(C6F5)3 avoids the use of expensive precious metal catalysis,which is difficult to completely remove during post-processing.The reaction proceeds under mild conditions and provides an easy route to the formation of Si—O—C linkage.Using the reaction,POSS based organic-inorganic hybrid porous materials were prepared by bonding propeller tetraphenylethylene(TPE)molecules with POSS.Nitrogen adsorption-desorption analysis and thermogravimetric analysis were performed on the hybrid material,which was found to have a combined structure of mesoporous and microporous,and good thermal stability,with a specific surface area of 582 m2/g and Td of 463 ℃.
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