Hypercrosslinked polysilsesquioxane networks

Very interesting arylene-bridged polysilsesquioxane networks were described by Loy and Shea [279] and Shea et al. [280]. Aromatic hydrocarbons containing two (or more) triethoxysilyl groups were used as the starting compounds  

Shea et al. [281] have also succeeded in making a low-density aerogel from tetramethoxysilane and p-di(triethoxysilyl)benzene in one step using supercritical CO2 as a solvent. The highly porous monolithic samples exhibited a specific internal surface area over 700 m g. 

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