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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/14721
Tipo: Artigo de Periódico
Título: Partially pyrolyzed poly(dimethylsiloxane)-based networks: thermal characterization and evaluation of the gas permeability
Título(s) alternativo(s): Journal of Polymer Science Part B: Polymer Physics
Autor(es): José, Nadia Mamede
Prado, Luis Antônio Sanches de Almeida
Schiavon, Marco A.
Redondo, Simone U. A.
Yoshida, Inez V. P.
Autor(es): José, Nadia Mamede
Prado, Luis Antônio Sanches de Almeida
Schiavon, Marco A.
Redondo, Simone U. A.
Yoshida, Inez V. P.
Abstract: In this investigation, the preparation and characterization of partially pyrolyzed membranes based on poly(dimethylsiloxane) (PDMS) are described. These membranes were obtained by the crosslinking of silanol-terminated PDMS with multifunctional nanoclusters derived from the reaction of pentaerythritoltriacrylate with 2-aminoethyl-3-aminopropyltrimethoxysilane and the in situ polycondensation of tetraethylortosilicate, followed by the thermal treatment of the resulting membranes at different temperatures. The partially pyrolyzed membranes were characterized with infrared spectroscopy, thermogravimetry, elemental analyses, dynamic mechanical analysis, small-angle X-ray scattering, and scanning electron microscopy. The membranes exhibited improvements in the thermal stability and mechanical strength. Even with distinct compositions with respect to the Si/O and Si/C ratios, the flexibility of these materials was maintained. The flux rates of the gases through the membranes were measured for N2, H2, O2, CH4, and CO2, at 25 °C. The permeability of the membranes changed with increases in the pyrolysis and oxidation temperatures. These membranes could be described as PDMS chains separated by inorganic clusters.
Palavras-chave: Crosslinking
Mechanical properties
Networks
Polysiloxanes
Thermogravimetric analysis (TGA)
Tipo de Acesso: Acesso Aberto
URI: http://repositorio.ufba.br/ri/handle/ri/14721
Data do documento: 2006
Aparece nas coleções:Artigo Publicado em Periódico (Química)

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