Laponite RD/polystyrenesulfonate nanocomposites obtained by photopolymerization

Autor(es)

Batista, Tatiana ^[1] ; Chiorcea-Paquim, Ana-Maria ^[2] ; Oliveira Brett, Ana Maria ^[2] ; Schmitt, Carla C. ^[1] ; Neumann, Miguel G. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Coimbra, Fac Ciencias & Tecnol, Dept Quim, P-3000 Coimbra - Portugal

• Tipo de documento: Artigo Científico
• Fonte: APPLIED CLAY SCIENCE; v. 53, n. 1, p. 27-32, JUL 2011.
• Citações Web of Science: 6

Resumo

The present paper describes the synthesis and characterization by dynamic light scattering, X-ray diffraction, scanning electron microscopy and atomic force microscopy of Laponite RD/Sodium polystyrenesulfonate nanocomposites obtained by radical photopolymerization initiated by the cationic dye safranine. The presence of the clay mineral does not affect the hydrotropic aggregation of the monomers, but allows a better deaggregation of the initiator molecules, decreasing the quenching of the excited states that leads to the radicals that initiate polymerization. Increasing the amount of clay mineral loading in the polymerization mixture promotes higher monomer conversion and faster polymerization. The size of the nanocomposite particles, measured by light scattering decreases from 400 to 80 nm for clay mineral loadings of 1.0 wt.%. The X-ray diffraction patterns indicate that the clay mineral does not present a regular crystalline structure in the nanocomposite. Atomic force microscopy studies show films of sodium polystyrenesulfonate polymer with embedded Laponite platelets in its structure, forming 1-8 nm height and 25-100 nm diameter aggregates. (C) 2011 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 07/08515-9 - Polimerização fotoiniciada: reações elementares e processos globais
• Beneficiário: Miguel Guillermo Neumann
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 05/03692-4 - Contribuições aos estudos da fotoestabilidade de corantes em polímeros
• Beneficiário: Carla Cristina Schmitt Cavalheiro
• Linha de fomento: Auxílio à Pesquisa - Regular