In situ elevated‐temperature drift spectroscopyof γ‐aminopropyltriethoxysilane as a condensed phase and a coated film on silica surface

Abstract It is the purpose of this study to determine the structure of γ‐amlnopropyltriethoxysilane (APS) on the surface of silica. Diffuse Reflectance spectroscopy (DRIFT) was employed to study the molecular structure of the partially condensed (APS) and Al's‐coated silica at 90°C. The condensed APS and Al's‐coated silica were prepared at the natural pH (10.3) of the APS and in the ambient environment. At room temperature, amino groups of the condensed APS and the APS‐coated silica form the amine carbonate and amine bicarbonate salts. Upon heat treatment, the amino salt structures are eliminated, leaving the amino groups in non‐bonded form.