Alkylene-bridged polysilsesquioxane aerogels: highly porous hybrid organic-inorganic materials

Preparation and Characterization of Highly Cross-Linked Polyimide Aerogels Based on Polyimide Containing Trimethoxysilane Side Groups

“…According to Loy et al and Sugahara and co-workers, the signals between −40 and −75 ppm were assigned to three types of silicon. 38,39 In order to clarify the condensation degree of the methoxy groups on silicon atom, curve fitting and peak integration were carried out using the Fityk software. The molar ratio of [−Si(OCH 3 The polyimide containing trimethoxysiloxane side groups was soluble in DMF.…”

Texture and micro-nanostructure of porous silicon oxycarbide glasses prepared from hybrid materials aged in different solvents

“…19 Drying liquids whose properties are specifically selected were demonstrated to exert a predicted capillary pressure within the evolving pore structure. 20,21 In this sense, non-polar (n-alkanes), polar (acetone, n-alcohols) and mixtures of such solvents, have been used for modifying pore structures and porosities of silica xerogels. For these materials the use of selected solvents mainly controls the capillary pressure, however for sol-gel derived organic-inorganic hybrid materials the solvents may influence not only the capillary pressure but also the extraction of organic molecules entrapped or weakly bonded to the hybrid structure.…”

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“…22 Loy et al have formed novel aerormosil materials by inserting organic bridges into the silicate network, through the hydrolysis-condensation of trialkoxylsilyl-terminated organic molecules such as p-triethoxylsilylbenzne. 23 Due to higher functionality (i.e., 3 in triethoxysilyl vs. 1 in silanol), all of the organic functional groups were attached to the silica network by C-Si covalent bonds in both cases, which was proven by 29 Si solid-state NMR results. The leaching out of organic ingredients can be prevented completely by using this approach.…”