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In‐line evaluation of average particle size in styrene suspension polymerizations using near‐infrared spectroscopy
Author(s) -
Santos A. F.,
Lima E. L.,
Pinto J. C.
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19981128)70:9<1737::aid-app11>3.0.co;2-2
Subject(s) - polystyrene , particle size , absorbance , suspension (topology) , spectroscopy , particle (ecology) , materials science , styrene , analytical chemistry (journal) , infrared spectroscopy , suspension polymerization , polymer chemistry , polymerization , chemistry , optics , composite material , copolymer , physics , chromatography , polymer , organic chemistry , mathematics , oceanography , quantum mechanics , homotopy , pure mathematics , geology
The main objective of this article is evaluating the influence of average polystyrene particle size upon the near‐infrared (NIR) spectra collected during suspension polymerization experiments and observing whether NIR spectroscopy may be used for in‐line monitoring and control of average particle size. It is shown that NIR spectra are sensitive to changes of the average particle size, and that standard empirical models (PLS—partial least squares—and NN—neural networks) may be built to correlate average particle size and light absorbance at certain wavelengths fairly well. Finally, it is shown that these models allow the in‐line evaluation of average particle size in styrene suspension polymerizations with NIR spectroscopy. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 70: 1737–1745, 1998