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Published on: May 1, 2012
[Quantitative monomolecular coverage of barium glass by the silane coupling agent
Guang-liang Niu1, Tong Wang, Heng-chang Xu
1Department of Stomatology, Beijing Hospital of Integrated Traditional Chinese Medicine with Western Medicine, Beijing 100039, China.
Objective:
To study the monomolecular coverage of the silane coupling agent gamma-methacryloxypropyltrimethoxysilane (gamma-MPS) on the barium glass filler surface.
Methods:
Kubelka-Munk (K-M) function values of the isolated OH-groups on the barium glass filler surface, which were based on the change of gamma-MPS concentrations, were measured using the quantitative analysis of the diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. When all of the isolated OH-groups on the filler surface disappeared (where the K-M function values was zero), the monomolecular coverage of the gamma-MPS molecules on the filler surface was indicated by the linear regression analysis.
Results:
The relationship tallied with negative linear correlation between the K-M function values of the isolated OH-groups on the barium glass surface and the concentrations of gamma-MPS. Each gamma-MPS molecule occupied 0.21 nm(2) when the monomolecular coverage was formed on the barium glass surface.
Conclusions:
The result of this study indicated the optimal amount of silane coupling agent on silanated barium glass filler during the production of resin composite.
