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From Precursors to Non-Oxide Ceramics: Pyrolytic Mechanisms Studied by NMR

Published online by Cambridge University Press:  10 February 2011

W. M. Sigmund ,
M. Feike ,
H. W. Spiess  and
F. Aldinger
W. M. Sigmund
Affiliation:
University pf Stuttgart, Institute for Nonmetallic Inorganic Materials, 70569 Stuttgart, Germany
M. Feike
Affiliation:
Max-Pylanck-Institute for Polymer Research, 55128 Mainz, Germany
H. W. Spiess
Affiliation:
Max-Pylanck-Institute for Polymer Research, 55128 Mainz, Germany
F. Aldinger
Affiliation:
University pf Stuttgart, Institute for Nonmetallic Inorganic Materials, 70569 Stuttgart, Germany
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Abstract

The pyrolysis of a poly ethylsilazane was studied using a CO2-laser beam heated solid state MAS-NMR probe head. Chemical structures of the intermediate stages could be identified. The analogy of the pyrolysis evolution for the following two different methods could be shown: A) in an inert gas furnace conventionally prepared and B) laser irradiated in the NMR probe head under magic-angle spinning (MAS) conditions. Samples prepared by method A were studied by 29Si MAS-NMR and samples prepared by method B were studied with an appropriate cross polarization time by 29Si CP-MAS-NMR. Both experiments showed the same mechanisms for the pyrolysis as the polymer is transformed into a Si3N4/C ceramic.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 410: Symposium S – Covalent Ceramics III-Science and Technology of Non-Oxides , 1995 , 429
Copyright
Copyright © Materials Research Society 1996

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References

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