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Type: Artigo de periódico
Title: Cationic Latex Formation By Ionic Modification.
Author: Schumacher, Heloisa Cajon
Alves, Marilene
Leite, Carlos Alberto Paula
Santos, Juliane Pereira
Neto, Erico Teixeira
Murakami, Mauro Makoto
Galembeck, Fernando
do Amaral, Marcelo
Abstract: Stable cationic latices were prepared by charge inversion of anionic styrene-acrylic copolymer latices upon binding Al3+ and Fe3+ ions. This is achieved by stabilizing the latices with a high-HLB (hydrophile-lypophile balance) nonionic surfactant that imparts strong steric stability to the latex, even in the presence of high concentrations of multivalent counterions while these are bound to the latex anionic sites. The cationic latices thus prepared have good stability properties, and the same procedure should be applicable to essentially any latex-carrying anionic sites. Analytical ESI-TEM images show that particle-bound iron is concentrated at the particle borders, but it is also found in the particle bulk.
Rights: fechado
Identifier DOI: 10.1016/j.jcis.2006.09.057
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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