Elizalde Oihana, Asua José M, Leiza Jose R
Institute for Polymer Materials, POLYMAT, and Grupo de Ingeniería Química, Departamento de Química Aplicada, Facultad de Ciencias Químicas, University of the Basque Country, Apdo, 1072, 20080 Donostia-San Sebastián, Spain.
Appl Spectrosc. 2005 Oct;59(10):1270-9. doi: 10.1366/000370205774431025.
A high solids content n-butyl acrylate/methyl methacrylate emulsion copolymerization process carried out under starved semi-batch conditions was for the first time monitored on-line by means of Fourier transform (FT)-Raman spectroscopy. Partial least squares regression was employed to build calibration models that allowed relating the spectra with solids content (overall conversion), free amounts of both n-butyl acrylate (n-BA) and methyl methacrylate (MMA), and cumulative copolymer composition. In spite of the heterogeneous nature of the polymerization, the similarities of the spectra for MMA, n-BA, and for the copolymer, and the low monomer concentrations in the reactor, the FT-Raman spectroscopy has been shown to be a suitable noninvasive sensor to accurately monitor the process. Therefore, it is well suited for on-line control of all-acrylic polymerization systems.
首次通过傅里叶变换（FT）-拉曼光谱法在线监测了在饥饿半间歇条件下进行的高固含量丙烯酸正丁酯/甲基丙烯酸甲酯乳液共聚过程。采用偏最小二乘回归建立校准模型，该模型能够将光谱与固含量（总转化率）、丙烯酸正丁酯（n-BA）和甲基丙烯酸甲酯（MMA）的游离量以及累积共聚物组成相关联。尽管聚合反应具有多相性、MMA、n-BA和共聚物光谱的相似性以及反应器中单体浓度较低，但FT-拉曼光谱已被证明是一种合适的非侵入式传感器，可准确监测该过程。因此，它非常适合全丙烯酸聚合体系的在线控制。
