Silicone rubbers filled with TiO2: Characterization and photocatalytic activity

Autor(es)

Silva, V. P. ^[1] ; Paschoalino, M. P. ^[1] ; Goncalves, M. C. ^[1] ; Felisberti, M. I. ^[1] ; Jardim, W. F. ^[1] ; Yoshida, I. V. P. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Quim, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Materials Chemistry and Physics; v. 113, n. 1, p. 395-400, JAN 15 2009.
• Citações Web of Science: 15

Resumo

Compounding of silicone rubbers with TiO(2) was carried out in a two-roll mill from a mixture of TiO(2) and poly(dimethylsiloxane) (PDMS) with several other additives. The silicone matrix was crosslinked by a platinum-catalyzed hydrosilylation reaction. Characterization of the rubbers was per-formed by thermogravimetric and dynamic mechanical analyses, swelling measurements in toluene and in a salicylic acid/water solution, UV-vis spectroscopy and field emission scanning electron microscopy. The photocatalytic activity of the rubbers was evaluated with respect to the photodegradation of salicylic acid in aqueous solution under UV radiation, by measuring total organic carbon. The thermal stability of the PDMS matrix was enhanced by the addition of 10 phr (parts per hundred parts of rubber, by weight) of TiO(2), but a further increase in the quantity of TiO(2) favored thermal degradation of the matrix. The stiffening effect promoted by the incorporation of TiO(2) into the matrix was more pronounced at higher TiO(2) amount. The increase in the quantity of TiO(2) also promoted a decrease in the crosslinking density of the matrix, favoring the swelling of the rubbers. The rubber with 78 phr of TiO(2) degraded 56% of the salicylic acid from an aqueous solution. (C) 2008 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 04/04810-8 - Utilização de fotocatálise heterogênea na desinfecção de atmosferas confinadas
• Beneficiário: Matheus Paes Paschoalino
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 03/09926-1 - Materiais poliméricos e cerâmicos
• Beneficiário: Inez Valeria Pagotto Yoshida
• Modalidade de apoio: Auxílio à Pesquisa - Programa PRONEX - Temático