Supercritical CO2-organosilane mixtures for modification of silica: Applications to epoxy prepolymer matrix

Autor(es)

Livi, Sebastien ^{[1, 2, 3]} ; Silva, Adriana A. ^[4] ; Pereira, Jessica ^[4] ; Nguyen, Thi Khanh Ly ^[5] ; Soares, Bluma Guenther ^[4] ; Cardoso, Mateus Borba ^[6] ; Gerard, Jean-Francois ^{[7, 8, 5]} ; Duchet-Rumeau, Jannick ^{[7, 8, 5]}

Afiliação do(s) autor(es)

^[1] Univ Lyon, F-69003 Lyon - France

^[2] INSA Lyon, F-69621 Villeurbanne - France

^[3] CNRS, UMR 5223, F-69621 Villeurbanne - France

^[4] Univ Fed Rio de Janeiro, Inst Macromol, BR-27941598 Rio De Janeiro, RJ - Brazil

^[5] Thi Khanh Ly Nguyen, CNRS, UMR 5223, F-69621 Villeurbanne - France

^[6] LNLS, BR-13083970 Campinas, SP - Brazil

^[7] Thi Khanh Ly Nguyen, Univ Lyon, F-69003 Lyon - France

^[8] Thi Khanh Ly Nguyen, INSA Lyon, F-69621 Villeurbanne - France

• Tipo de documento: Artigo Científico
• Fonte: CHEMICAL ENGINEERING JOURNAL; v. 241, p. 103-111, APR 1 2014.
• Citações Web of Science: 10

Resumo

This work is focused on the use of supercritical carbon dioxide (ScCO2) as an environmentally friend process to improve the surface functionalization of silica nanoparticles with amino- and perfluoro-silanes. Here, we combine the use of a phosphonium ionic liquid which plays a role of an activator of silanol groups in ScCO2 to increase the grafting density of silane agents on silica. Then, diglycidyl ether of bisphenol A (DGEBA)-based epoxy nanocomposites filled with different amount of new functionalized silicas (1, 2.5 and 3.5 phr) are prepared and characterized by dynamic-mechanical analysis, transmission electron microscopy and small-angle X-ray scattering. Finally, the treated silica/epoxy systems exhibit better mechanical properties (+30%) when compared to neat epoxy. (C) 2013 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/21954-7 - Funcionalização de nanopartículas compósitas para aplicações biomédicas
• Beneficiário: Mateus Borba Cardoso
• Modalidade de apoio: Auxílio à Pesquisa - Regular