Diffuse Reflectance Fourier Transform Infrared Spectroscopic Study of Chemical Bonding and Hydrothermal Stability of an Amino Silane on Metal Oxide Surfaces.

摘要

Fourier transform infrared spectroscopy is used to study the metal oxide/silane interface. Structures of gamma-aminopropyldimethylethoxysilane (gamma-APDMES) coupling agent on the surface of metal oxide powders are proposed. The structure depends on the surface characteristics of the substrate. The amine group of the silane molecule forms a hydrogen bond with the silica surface. The enhanced intensity of the amine band around 1/71600 C indicates that amine group forms a complex on the titanium and aluminum oxide surfaces as well as hydrogen bond. By using the diffuse reflectance infrared technique, the Al-O-Si and Ti-O-Si antisymmetric frequencies are detected at 963 and 1/950 cm, respectively, which agree favorably with the calculated frequencies. When the treated metal oxide powders are immersed in 80 degrees C water, the desorption of silance is more rapid when aluminum powder, rather than titanium powder, is the substrate. Silica powder, however, forms a more hydrophobic surface. The rate of silane desorption decreased in the order of aluminum oxide, titanium oxide, and silicon oxide. (Author)