Synthesis and sol-gel polymerization of [Si8O12](OCH3)8

Synthesis and structure of functional spherosilicate building block molecules for materials synthesis

“…Once functionalized, these silicate building blocks can be used as polyfunctional monomers that may be cross-linked together to produce three-dimensional silicate polymers. For example, high surface area materials have been made from the sol-gel polymerization of (CH 3 O) 8 [17][18][19]. Inorganic/organic hybrid porous materials have been made by linking Si 8 O 12 units together with organic groups of various lengths via a hydrosilylation reactions [20,21].…”

Effects of progressive changes in organoalkoxysilane structure on the gelation and pore structure of templated and non-templated sol–gel materials

“…When these structures form, gelation happens at a much higher overall conversion than is predicted by random branching theory, and the cages or rings interconnect into a three-dimensional network structure very slowly [28][29][30][31][32]. When one of the alkoxy groups of TMOS is replaced with -CH 3 to form MTMS, cage-like nanoparticles would still be expected to form, but their solubility is limited [33][34][35].…”

Vinyl ether-modified poly(hydrogen silsesquioxanes) as dielectric materials

“…The pore size distributions in the mesopore region were calculated using the Barrett-Joyner-Halenda method. 30 Thermogravimetric analysis and evolved gas analysis. TGA was performed using a Thermoplus Rigaku TG-DTA 8101D model under a nitrogen flow from ambient to 800 uC with a ramp of 20 uC min 21 .…”

“…PHSQ typically displays a multimodal molecular weight distribution including discrete peaks corresponding to oligomers and a broad peak for polymeric molecules. Although a number of compounds in these oligomers were isolated by Agaskar and Klemperer using chromatographic methods and shown to adopt cage structures, [30][31][32] the structure for the high molecular weight fraction is still largely unknown. The structure of PSQs is generally complex and is postulated to adopt varieties of structures including ''ladder'', mixed ladder/cage and other configurations.…”