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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Silicone rubbers filled with TiO2: Characterization and photocatalytic activity

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Author(s):
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]
Total Authors: 6
Affiliation:
[1] Univ Estadual Campinas, Inst Quim, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Materials Chemistry and Physics; v. 113, n. 1, p. 395-400, JAN 15 2009.
Web of Science Citations: 15
Abstract

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)

FAPESP's process: 04/04810-8 - The use of heterogeneous photocatalysis in the disinfection of indoor air
Grantee:Matheus Paes Paschoalino
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 03/09926-1 - Polymeric and ceramic materials
Grantee:Inez Valeria Pagotto Yoshida
Support Opportunities: PRONEX Research - Thematic Grants