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High temperature ceramics for use in membrane reactors: the development of microporosity during the pyrolysis of polycarbosilanes

Williams, H.M., Dawson, Elizabeth A., Barnes, Philip A., Rand, B., Brydson, Rik M.D. and Brough, A.R. (2002) High temperature ceramics for use in membrane reactors: the development of microporosity during the pyrolysis of polycarbosilanes. Journal of Materials Chemistry, 12. pp. 3754-3760. ISSN 0959-9428

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    The pyrolysis of polycarbosilane (PCS), a ceramic precursor polymer, at temperatures up to 700 uC under an inert
    atmosphere results in the development of amorphous microporous materials which have a number of potential
    applications, such as gas separation membranes. This paper investigates the development of microporosity
    during pyrolysis under nitrogen, at temperatures ranging from 300 to 700 uC, of both the cross-linked and noncross-
    linked starting materials. The products are characterised by nitrogen adsorption, to determine surface
    areas and pore volumes, solid-state NMR, electron microscopy and FTIR, and their formation is studied using
    thermal analysis and evolved gas analysis with on-line mass spectrometry. The cross-linked and non-crosslinked
    PCSs have a maximum micropore volume of 0.2 cm3 g21 at pyrolysis temperatures of between 550
    and 600 uC. The microporosity is stable in air at room temperature, but is lost in oxidising atmospheres at
    elevated temperatures.

    Item Type: Article
    Additional Information: © The Royal Society of Chemistry 2002
    Uncontrolled Keywords: microporosity polycarbosilanes
    Subjects: Q Science > QD Chemistry
    Schools: School of Applied Sciences
    School of Applied Sciences > Materials and Catalysis Research Centre
    Related URLs:

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    Depositing User: Briony Heyhoe
    Date Deposited: 12 Jul 2007
    Last Modified: 16 Mar 2011 11:06


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