Latex coagulation induced by alcohol vapors: an unusual factor for colloidal instability

A polystyrene (PS) latex prepared by redox initiation is coagulated by exposure to the vapors of lower alcohols (methanol to 2-butanol) as well as to alcohol–water (>30% w/w) solutions, but not to the vapors of higher alcohols and many other solvents. Latex particle size determinations by PCS, un...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2000-05, Vol.164 (2), p.217-225
Main Authors: Galembeck, Fernando, Braga, Melissa, do Carmo Vasconcelos Medeiros da Silva, Maria, Herzog Cardoso, André
Format: Article
Language:English
Subjects:
Coagulation by alcohols
PS latex stability
Solvent-induced coagulation
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Summary:A polystyrene (PS) latex prepared by redox initiation is coagulated by exposure to the vapors of lower alcohols (methanol to 2-butanol) as well as to alcohol–water (>30% w/w) solutions, but not to the vapors of higher alcohols and many other solvents. Latex particle size determinations by PCS, under various exposure conditions, show that the vapor-induced coagulation takes place at the liquid latex surface, rather than within the liquid, but the effect of co-solvent alcohols on particle diameters under non-coagulating concentrations is significant (∼10%). Two major fractions of the latex are discerned by centrifugation in density gradients as well as by SEM examination of dry coaguli formed under ethanol vapor.
ISSN:0927-7757
1873-4359
DOI:10.1016/S0927-7757(99)00401-X