硅烷偶联剂γ-MPS在钡玻璃表面单分子层覆盖的定量研究

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

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(-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0·21nm2。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。

Objective To study the monomolecular coverage of the silane coupling agent γ-methacryloxypropyltrimethoxysilane（γ-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 γ-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 γ-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 γ-MPS. Each γ-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 comaosite.