Cationic latex formation by ionic modification |
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Authors: | Schumacher Heloisa Cajon Alves Marilene Leite Carlos Alberto Paula Santos Juliane Pereira Neto Erico Teixeira Murakami Mauro Makoto Galembeck Fernando do Amaral Marcelo |
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Institution: | Instituto de Química, Universidade Estadual de Campinas, Caixa Postal 6154, 13084-971 Campinas, SP, Brazil. |
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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. |
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