This work studied the at-line Raman spectroscopy monitoring for the inverse miniemulsion polymerization of acrylamide. The conversion was determined from the Raman spectra without previous calibration using the peaks corresponding to CH 2 and CC functional groups of acrylamide. Gravimetric data was used to validate the results of conversion obtained with the Raman spectra. Dynamic light scattering was used to measure the particle size. The results show that high energy in the homogenization step increases the surface area of the droplets and generates a lack of surfactant, which results in larger diameters. It is possible to make at-line monitoring of monomer conversion directly from the Raman spectra without using calibration models. The data obtained show an incomplete conversion that is also confirmed by gravimetric analysis.
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