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Styrene Emulsion Polymerization above the CMC: New Evidence on Particle Nucleation by means of AFFFF
Author(s) -
Carro Shirley,
HerreraOrdonez Jorge
Publication year - 2006
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200500707
Subject(s) - emulsion polymerization , styrene , materials science , emulsion , polymer chemistry , polymerization , monomer , particle size , particle (ecology) , pulmonary surfactant , field flow fractionation , chemical engineering , chemistry , polymer , copolymer , chromatography , fractionation , organic chemistry , composite material , oceanography , engineering , geology
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 (AF 4 ). Bimodal PSDs were obtained, suggesting that coagulation of the primary particles is not as extensive as would be expected, according to the coagulative mechanism. AF 4 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 AF 4 and DLS. The initial surfactant ( S 0 ), initiator ( I 0 ) and monomer ( M 0 ) concentrations are indicated in the figure.