A novel PAN/silazane hybrid polymer for processing of carbon-based fibres with extraordinary oxidation resistance

A novel hybrid polymer made up of acrylonitrile (AN) and a commercial available oligosilazane (ML33) was developed as a precursor for the processing of carbon-based fibres with extraordinary intrinsic oxidation stability up to 800 °C. While polyacrylonitrile is used as the typical precursor for carb...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2017, Vol.5 (2), p.72-729
Main Authors: Ribeiro, L. F. B, Flores, O, Furtat, P, Gervais, C, Kempe, R, Machado, R. A. F, Motz, G
Format: Article
Language:English
Subjects:
Ceramic fibers
Ceramics
Chemical Sciences
Fibers
Material chemistry
Oxidation
Oxidation resistance
Polyacrylonitriles
Precursors
Silicon carbonitride
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Summary:A novel hybrid polymer made up of acrylonitrile (AN) and a commercial available oligosilazane (ML33) was developed as a precursor for the processing of carbon-based fibres with extraordinary intrinsic oxidation stability up to 800 °C. While polyacrylonitrile is used as the typical precursor for carbon fibres, a polysilazane derived SiCN ceramic phase should lead to improved oxidation resistance. Thermogravimetric analysis demonstrated that depending on the AN/ML33 ratio the weight loss during pyrolysis is drastically reduced up to 63% due to crosslinking reactions between both components, confirmed by NMR spectroscopy investigations. Unexpectedly, with increasing AN content in the starting composition the thermal treatment up to 1500 °C leads to a change from amorphous C/SiCN to C/Si 3 N 4 nanocomposites confirmed by NMR, XRD and TEM measurements. The homogeneously distributed ceramic phase within the carbon matrix is responsible for the extraordinary intrinsic oxidation stability of this new type of carbon-based fibre. Development of carbon-based fibres with extraordinary oxidation resistance by combining typical manufacturing methods of PAN-based CFs with PDC technology.
ISSN:2050-7488
2050-7496
DOI:10.1039/c6ta09293d