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Materials Research

versão impressa ISSN 1516-1439versão On-line ISSN 1980-5373

Resumo

SILVA, Elisângela Aparecida da; WINDMOLLER, Dario; SILVA, Glaura Goulart  e  FIGUEIREDO, Kátia Cecília de Souza. Polydimethylsiloxane Membranes Containing Multi-walled Carbon Nanotubes for Gas Separation. Mat. Res. [online]. 2017, vol.20, n.6, pp.1454-1460.  Epub 17-Ago-2017. ISSN 1980-5373.  http://dx.doi.org/10.1590/1980-5373-mr-2016-0825.

Polydimethylsiloxane (PDMS) membranes with different concentrations of multi-walled carbon nanotubes were prepared in order to evaluate their gas separation performances. Mixed matrix membranes were characterized by scanning electron microscopy, thermogravimetric analysis, Fourier transformed infrared, positron annihilation lifetime and Raman spectroscopies and X-ray diffraction. The permeabilities to CO2, CH4, N2 and O2 were determined. No phase separation was noticed. For carbon nanotubes content of 1 wt%, it was shown a decrease in membrane permeability with slight increase in ideal selectivity, compared to pure PDMS. However, the increase in the filler load up to 6.7 wt% increased the free volume average size of the membranes, improving the contribution of the diffusion to the transport and decreasing ideal selectivities of CO2/CH4, CO2/N2 and O2/N2.

Palavras-chave : carbon dioxide; gas separation; mixed matrix membranes; multi-walled carbon nanotubes; polydimethylsiloxane.

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