Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/61199
Type: Artigo de periódico
Title: Latex surface and bulk coagulation induced by solvent vapors
Author: Braga, M
da Silva, MDVM
Cardoso, AH
Galembeck, F
Abstract: Latex exposure to solvent vapors leads to highly specific changes in latex stability as well as on the morphologies of the particle association products, depending on the latex and solvent used. Examples of solvent vapor-induced aggregation are given: surface films are obtained on two PS latexes; in one case, the film surface is mirror-reflective and very hat, as evidenced by AFM. Another PS latex coagulates under exposure to acetone vapors, and the morphologies of the coagula are highly sensitive to the exposure conditions. This latex yields a highly porous foam-like structure, in which particles are strongly coalesced but form percolating patches around the pores. The same latex but under other conditions produces a coagulum of large numbers of aggregated particles with a raspberry-like morphology. Density centrifugation experiments show that the effect of solvents on different latex fractions is not uniform, and some fractions show larger density changes than others, thus evidencing a variability in their swelling ability. (C) 2000 Academic Press.
Subject: latex film formation
PS latex stability
solvent effects on latex stability
solvent-induced coagulation
Country: EUA
Editor: Academic Press Inc
Rights: fechado
Identifier DOI: 10.1006/jcis.2000.6920
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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