Issue 12, 2002
From the journal:

Journal of Materials Chemistry

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

Howard M. Williams,a   Elizabeth A. Dawson,a   Philip A. Barnes,*a   Brian Rand,b   Rik M. D. Brydsonb  and  Adrian R. Broughb  

* Corresponding authors

a Centre for Applied Catalysis, Materials Research Division, Department of Chemical and Biological Sciences, University of Huddersfield, Queensgate, Huddersfield, UK

b Department of Materials, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds, UK

Abstract

The pyrolysis of polycarbosilane (PCS), a ceramic precursor polymer, at temperatures up to 700 °C 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 °C, of both the cross-linked and non-cross-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-cross-linked PCSs have a maximum micropore volume of 0.2 cm3 g−1 at pyrolysis temperatures of between 550 and 600 °C. The microporosity is stable in air at room temperature, but is lost in oxidising atmospheres at elevated temperatures.

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

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Article information

DOI
https://doi.org/10.1039/B205892H
Article type
Paper
Submitted
19 Jun 2002
Accepted
24 Sep 2002
First published
10 Oct 2002

J. Mater. Chem., 2002,12, 3754-3760

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

H. M. Williams, E. A. Dawson, P. A. Barnes, B. Rand, R. M. D. Brydson and A. R. Brough, J. Mater. Chem., 2002, 12, 3754 DOI: 10.1039/B205892H

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