Styrene Emulsion Polymerization above the CMC: New Evidence on Particle Nucleation by means of AFFFF

The number (N) and size distribution of particles (PSD) of a styrene emulsion polymerization above the CMC were studied by means of asymmetric flow‐field flow fractionation (AF4). Bimodal PSDs were obtained, suggesting that coagulation of the primary particles is not as extensive as would be expecte...

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Bibliographic Details
Published in:Macromolecular rapid communications. 2006-02, Vol.27 (4), p.274-278
Main Authors: Carro, Shirley, Herrera-Ordonez, Jorge
Format: Article
Language:English
Subjects:
AFFFF
Applied sciences
dynamic light scattering
emulsion polymerization
Exact sciences and technology
Organic polymers
particle nucleation
particle size distribution
Physicochemistry of polymers
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:The number (N) and size distribution of particles (PSD) of a styrene emulsion polymerization above the CMC were studied by means of asymmetric flow‐field flow fractionation (AF4). Bimodal PSDs were obtained, suggesting that coagulation of the primary particles is not as extensive as would be expected, according to the coagulative mechanism. AF4 allowed it to be demonstrated that N is constant during interval II, and that the resolution limit of other particle sizing techniques can lead to erroneous mechanistic inferences, from the evolution of N. Particle size distribution measured at low conversion for the emulsion polymerization of styrene, obtained by AF4 and DLS. The initial surfactant (S0), initiator (I0) and monomer (M0) concentrations are indicated in the figure.
ISSN:1022-1336
1521-3927
DOI:10.1002/marc.200500707