Resumo

OLIVEIRA, Adriano M.; SILVA, Maria L.C.P.; ALVES, Gizelda M.  e  SANTOS, Amilton M.. Encapsulation of Titanium Dioxide (TiO₂) by the Technique of Emulsion Polymerization. Polímeros [online]. 2002, vol.12, n.2, pp.123-129. ISSN 1678-5169.  https://doi.org/10.1590/S0104-14282002000200012.

This work presents a methodology for encapsulation of TiO₂ by emulsion polymerization. The pigment was previously modified by a titanate in heptane. The titanate used was isopropoxy titanium tri-isostearate, which reacts with the hydroxyl groups at the pigment surface. The modified pigment was encapsulated by methyl methacrylate (MMA), using ammonium persulfate as initiator and sodium dodecyl sulfate (SDS) as surfactant. The encapsulation reactions were carried out, using a jacketed glass reactor, through two different polymerization processes: batch and semi-continuous processes. The characterization of the modified pigment was made with FTIR spectroscopy. The modification and encapsulation efficiency was determined by means of TGA.

Palavras-chave : Titanium dioxide; encapsulation; emulsion polymerization.

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