Abstract
Abstract In this study, the hydrolytic condensation of 3-(2-aminoethylamino)propyltrimethoxysilane and 3-aminopropyltrimethoxysilane was performed using aqueous trifluoromethanesulfonic acid (HOTf) as a catalyst and solvent at various setting temperatures and pressures in a Kugelrohr apparatus. The solvent evaporation time can be controlled by changing the pressure in the Kugelrohr apparatus. Ammonium-functionalized polyhedral oligomeric silsesquioxane (POSS) mixtures with high proportions of cage octamer (T8-POSS) were consequently obtained at lower setting temperatures (60 °C) in a Kugelrohr apparatus regardless of the solvent evaporation times (2–10 h). Meanwhile, using higher setting temperatures (100 °C and 120 °C) and longer solvent evaporation times (6–8 h), the proportion of cage decamer (T10-POSS) in the POSS mixture increased. Therefore, T10-POSS formed more easily than T8-POSS during reactions in which the solvent was evaporated at higher temperatures and for longer times.
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