Synthesis and characterization of soluble and meltable poly(aminopropyl/phenylsilsesquioxane)

Abstract

The hydrolytic co-condensation of hydrophobic phenyltriethoxysilane (PTES) and hydrophilic γ-aminopropyltriethoxysilane (APS) was investigated in toluene and water by using hydrochloric acid (HCl) catalyst. A soluble and meltable poly(aminopropyl/phenylsilsesquioxane) (PAPSQ) was formed by controlling HCl amounts, APS/PTES molar ratios, water/silane molar ratios (Rw/si), organic co-solvents and re-equilibration steps as well. The compositions of PAPSQ bearing aminopropyl and phenyl groups with the capping of trimethylsilyl group were confirmed by element analysis, fourier-transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR) and thermogravimetric analysis (TGA). Differential scanning calorimetry (DSC) was employed to characterize the melting behavior of the product. PAPSQ can be easily employed as functional molecular building blocks for the synthesis of diverse and novel inorganic-organic materials.

Keywords

phenyltriethoxysilane / γ-aminopropyltriethoxysilane / hydrolytic co-condensation / solubility / crystallizability

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