Título: Progress in Organic CoatingsImportada do Authenticus Pesquisar Publicações da Revista

Vol. 77 Nº 11

Páginas: 1741-1749

ISSN: 0300-9440

Editora: Elsevier

ISI Web of Knowledge - 10 Citações

ISI Web of Science

Scopus - 13 Citações

FOS: Ciências da engenharia e tecnologias

CORDIS: Ciências Tecnológicas

ID Authenticus: P-00G-3XE

DOI: 10.1016/j.porgcoat.2014.05.030

Abstract (EN): In this work, TiO2 nanoparticles were dispersed and stabilized in water using a novel type of dispersant based on tailor-made amphiphilic block copolymers of poly(ethylene glycol)-block-poly(4-vinyl pyridine) (mPEG-b-P4VP) prepared by atom transfer radical polymerization (ATRP). The performance of this new block copolymer as dispersant was compared to a polyelectrolyte dispersant commonly used for TiO2, sodium salt of polyacrylic acid (Na-PAA). The effect of dispersion technique and type and amount of dispersant on deagglomeration and stability of the TiO2 aqueous suspensions were studied. After incorporation in a standard waterborne acrylic varnish formulation, dry film transparency, photocatalytic activity, and nanoparticle cluster size were also evaluated. The results show that mPEG-b-P4VP copolymer with appropriate block lengths can have a better performance than Na-PAA in terms of aqueous dispersion stabilization and cluster size reduction in the acrylic matrix. This translates into higher film transparency and photocatalytic performance.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9