Stabilization of nano-TiO2 aqueous dispersions with poly(ethylene glycol)-b-poly(4-vinyl pyridine) block copolymer and their incorporation in photocatalytic acrylic varnishes

• Type: Article in International Scientific Journal
• Date: 2014

Authors

S. Monteiro (Author) FEUP; A. Dias (Author) FEUP; A. M: Mendes (Author) FEUP; J. Mendes (Author) Other; A. C. Serra (Author) Other; N. Rocha (Author) Other; J. F. J. Coelho (Author) Other; F. D. Magalhães (Author) FEUP

Journal

Title: Progress in Organic Coatings

Vol. 77 No. 11

Pages: 1741-1749

ISSN: 0300-9440

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 10 Citations

ISI Web of Science

Scopus - 13 Citations

Scientific classification

FOS: Engineering and technology

CORDIS: Technological sciences

Associated Projects

PTDC/EQU-EQU/115614/2009 - Síntese e caraterização de novos fotocatalisadores compósitos de TiO2-grafeno: aplicação no abatimento focotacalítico de NOx e fotoeletrólise da água para produção de hidrogénio

PTDC/EQU-EPR/114354/2009 - Preparação de nanopartículas hibridas magnéticas funcionalizadas por "self-assembly" de coplolimeros ABCDE para coating de elevada performance

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9