硅烷偶联剂γ-MPS在钡玻璃表面单分子层覆盖的定量研究

目的研究复合树脂生产中钡玻璃填料硅化处理时硅烷偶联剂γ-甲基丙烯酰氧丙基三甲氧基硅烷（γ-MPS）的最佳用量。方法应用漫反射傅立叶变换红外（DRIFT）光谱定量分析方法，测定钡玻璃表面游离羟基（一OH）随γ-MPS质量分数变化的Kubelka—Munk（K—M）函数值。通过线性回归分析，确定钡玻璃表面游离羟基全部消失（K—M函数值为零）时，γ-MPS在钡玻璃表面的单分子层覆盖情况。结果钡玻璃表面游离羟基的K—M函数值与γ-MPS质量分数存在负相关的直线相关关系。γ-MPS在钡玻璃表面单分子层覆盖所占据的面积为每分子0．21nm^2。结论确定了硅烷偶联剂在钡玻璃表面单分子层覆盖时的质量分数，为提高复合树脂的物理机械性能提供理论依据。

Quantitative monomolecular coverage of barium glass by the silane coupling agent γ-methacryloxypropyltrimethoxysilane

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.