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Synthesis of polyetherimide/silica hybrid membranes by the sol–gel process: influence of the reaction conditions on the membrane properties

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Abstract

Hybrid polyetherimide (PEI)–silica membranes were synthesized. The aim was to obtain improved materials for gas separation media. The inorganic material was prepared via the sol–gel method through the hydrolysis of tetraethoxysilane (TEOS). The influence of the reaction conditions on the final membrane morphology and properties were studied. Scanning electron microscopy (SEM), energy-dispersive X-ray analysis (SEM–EDX), and Fourier transform infrared spectroscopy (FTIR) were used to characterize the PEI and PEI–silica composite membranes. The evolution of TEOS hydrolysis and the condensation processes were verified by FTIR studies. The silica–polymer interaction was also analyzed. The SEM micrographs showed how the membranes distinct morphologies depended upon synthesis parameters and preparation techniques (presence of coupling agent, TEOS polymerization in situ or not, silica content and membranes redissolution). The permeation rates of CO2, CH4, O2, N2, and H2 through the pure polymer and hybrid membranes were measured and showed an increase of gas permeability for hybrid membranes but, the CO2/CH4 and O2/N2 selectivities decreased compared to PEI membranes.

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Acknowledgements

The authors would like to thank Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil) for the support of bilateral project BR/PA04-UXIV/008 as well as Agencia Nacional de Promoción Científica y Tecnológica (Grant PICTO 36716) and Consejo de Investigación-Universidad Nacional de Salta (Grant 1895/3). We also thank Ph.D. Nelio A. Ochoa from Laboratorio de Ciencias de Superficies y Medios Porosos, Departamento de Química, Universidad Nacional de San Luis, for his valuable help.

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Authors and Affiliations

  1. Facultad de Ingeniería, Instituto de Investigaciones para la Industria Química (INIQUI—CONICET), Universidad Nacional de Salta, Av. Bolivia 5150, A4402FDC, Salta Capital, Argentina

    Analia I. Romero, Mónica L. Parentis & Elio E. Gonzo

  2. Programa de Engenharia Química, COPPE/Universidade Federal de Rio de Janeiro, Cidade Universitária, Cx. Postal 68502, Rio de Janeiro, CEP 21941-972, Brazil

    Alberto C. Habert

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  1. Analia I. Romero
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  2. Mónica L. Parentis
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  3. Alberto C. Habert
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  4. Elio E. Gonzo
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Correspondence to Analia I. Romero.

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Romero, A.I., Parentis, M.L., Habert, A.C. et al. Synthesis of polyetherimide/silica hybrid membranes by the sol–gel process: influence of the reaction conditions on the membrane properties. J Mater Sci 46, 4701–4709 (2011). https://doi.org/10.1007/s10853-011-5380-4

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