采用激光共焦拉曼光谱法, 检测了丙酮/聚甲基丙烯酸甲酯(PMMA)涂层液固化过程中溶剂的浓度分布。分别测定了丙酮、PMMA以及不同质量浓度的丙酮/PMMA涂层夜的拉曼光谱, 利用最小二乘法建立了PMMA、丙酮的峰强比与二者质量浓度比的关系。试验结果表明, 校准曲线的线性相关系数达99.9%以上, 通过实时测定得到的光谱可以获得PMMA与丙酮的峰强度比, 进而可以获得该时刻溶剂的浓度。

The solvent concentration distribution in the curing process of the acetone/polymethyl methacrylate (PMMA) coating solution is measured by the laser confocal Raman spectroscopy method. The Raman spectra of acetone, PMMA, and acetone/PMMA coating solutions with different mass concentrations are respectively measured, and the relationship between the peak intensity ratio and the mass concentration ratio of PMMA to acetone is established with the least squares method. The experimental results show that the linear correlation coefficient of the calibration curve is above 99.9%. The peak intensity ratio of PMMA to acetone can be obtained from the spectra by real-time measurement and subsequently the solvent concentration at this moment is obtained.