Real‐Time Monitoring of Particle Size in Emulsion Polymerization: Simultaneous Turbidity and Photon Density Wave Spectroscopy

Particle size evolution in seeded semibatch emulsion polymerization is monitored by two real‐time monitoring techniques: online turbidity spectroscopy (TUS) and inline photon density wave spectroscopy (PDWS). An automatic dilution system that withdraws a sample from the reactor and upon dilution tra...

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Bibliographic Details
Published in:Macromolecular rapid communications. 2024-10, Vol.45 (20), p.e2400374-n/a
Main Authors: Aspiazu, Usue Olatz, Gómez, Susana, Paulis, Maria, Leiza, Jose Ramon
Format: Article
Language:English
Subjects:
Dilution
Emulsion polymerization
Emulsions
Latex
Light scattering
Luminous intensity
Monitoring
Particle size
PDWS
Photon correlation spectroscopy
Photon density
Photons
polymer particle size
Polymerization
Reactors
real‐time monitoring
Spectroscopy
Turbidity
TUS
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Summary:Particle size evolution in seeded semibatch emulsion polymerization is monitored by two real‐time monitoring techniques: online turbidity spectroscopy (TUS) and inline photon density wave spectroscopy (PDWS). An automatic dilution system that withdraws a sample from the reactor and upon dilution transfers to the measurement cell is used for the online TUS analysis. A PDWS probe is immersed in the reactor and collects inline the scattered light directly from the reacting latex. The particle sizes retrieved from TUS and PDWS are compared to offline dynamic light scattering (DLS) values. The particle size obtained by TUS is close to the intensity‐average particle size obtained offline by DLS, while the particle size obtained by PDWS lies closer to the number‐average particle size from DLS. Particle size evolution in seeded semibatch emulsion polymerization is simultaneously monitored by two real‐time monitoring techniques: online turbidity spectroscopy (TUS) and inline photon density wave spectroscopy (PDWS). The particle sizes retrieved from both real‐time monitoring techniques match significantly well with the values obtained offline by dynamic light scattering (DLS), but avoiding the delay produced by the offline technique.
ISSN:1022-1336
1521-3927
1521-3927
DOI:10.1002/marc.202400374