File(s) under permanent embargo
Reason: This item is currently closed access.
Polycyclodisilazane: a new polymeric precursor for silicon nitride-based ceramics
journal contributionposted on 2016-09-12, 13:25 authored by Xujin BaoXujin Bao, Mohan J. Edirisinghe
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.
The authors wish to thank the Soft Solid Initiative of EPSRC for funding our work (EPSRC Grant No. GR/L21976).
- Aeronautical, Automotive, Chemical and Materials Engineering
Published inJournal of Materials Chemistry
Pages395 - 401
CitationBAO, X. and EDIRISINGHE, M., 2000. Polycyclodisilazane: a new polymeric precursor for silicon nitride-based ceramics. Journal of Materials Chemistry, 10, pp.395-401.
Publisher© Royal Society of Chemistry
- VoR (Version of Record)
Publisher statementThis work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/