In-Line Reaction Monitoring of a Methyl Methacrylate and N, N-Dimethylacrylamide Copolymerization Reaction Using Near-Infrared Spectroscopy

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Fast and accurate monitoring of monomer concentration during copolymerization reactions is of much interest. It is known that near-infrared spectroscopy (NIRS) can be used to monitor polymerization reactions. Here, a free radical solution copolymerization reaction between methyl methacrylate and N,N-dimethylacrylamide is considered. NIR spectra were measured in-line with a transflectance probe. The spectra of both involved monomers are very similar, making monitoring with NIRS challenging. It is shown that the NIRS calibration can be set up with only a few (5) off-line measured mixtures. Several validation methods for such a NIRS calibration model are discussed and tested. NIRS is used to follow conversion of the two monomers in a copolymerization reaction on-line.

Document Type: Research Article


Affiliations: Polymer Research Division, BASF-AG, D-67056 Ludwigshafen, Germany

Publication date: July 1, 2004

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