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Title: Polycyclodisilazane: a new polymeric precursor for silicon nitride-based ceramics
Authors: Bao, Xujin
Edirisinghe, Mohan J.
Keywords: Polymers
Ceramics
Issue Date: 2000
Publisher: © Royal Society of Chemistry
Citation: BAO, X. and EDIRISINGHE, M., 2000. Polycyclodisilazane: a new polymeric precursor for silicon nitride-based ceramics. Journal of Materials Chemistry, 10, pp.395-401.
Abstract: Several new polycyclodisilazanes with different molecular structures were synthesized and characterized using gel permeation chromatography and Fourier-transform infrared spectroscopy. All the polymers synthesized were tractable. The pyrolysis of these polymers at 900 °C in nitrogen in a thermal balance indicated that the ceramic yields were very dependent on the compositions of the precursors. The polycyclodisilazanes with reactable groups (Si–H, N–H) showed higher ceramic yields due to the cross-linked structures formed during pyrolysis. The pyrolyzed residues were crystallized by heating to >1500 °C. X-Ray diffraction of the crystallized residues showed that they were mixtures containing silicon nitride and silicon carbide. Chemical analysis of one crystallized residue which gave the highest ceramic yield showed that it contained 70 wt% Si3N4 and 25 wt% SiC after heat treatment at 1600 °C. The compositions of the ceramic residues produced depended on the compositions of the polymeric precursors. More silicon carbide was formed in the residues derived from the polymers with phenyl group substituents.
Description: Closed access.
Sponsor: The authors wish to thank the Soft Solid Initiative of EPSRC for funding our work (EPSRC Grant No. GR/L21976).
Version: Published
DOI: 10.1039/A907898C
URI: https://dspace.lboro.ac.uk/2134/22405
Publisher Link: http://dx.doi.org/10.1039/A907898C
ISSN: 0959-9428
Appears in Collections:Closed Access (Materials)

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