pps proceeding - Abstract Preview
pps proceeding
Symposium: S11 - Polymer Synthesis and Modification
Poster Presentation
 
 

Polyimide as carbon and ceramic polysilazane precursors to obtain high carbon content ceramic for high-temperature applications

Bezerra André (1), Acosta Emanoelle Diz (1), Juchem Fernando (1), Mallmann Maíra Debarba (1), Ribeiro Luiz Fernando Belchior (1), Machado Ricardo (1)*

(1) Federal University of Santa Catarina - Santa Catarina - Brazil

In this work, a new pathway to obtain high carbon content ceramic for high-temperature applications was developed. Within this method, polyimide was used as carbon and ceramic polysilazane precursors. The reactions were conducted in an inert system and the resulting hybrid materials were pyrolyzed in nitrogen at temperatures of up to 1550 °C. TGA analyses indicated that the hybrid compounds suffered a mass loss superior to the pure compounds, which suggests an interaction between the ceramic precursor and polyimide during pyrolysis. DRX, RAMAN and TEM analyses revealed that the formed ceramic is composed of predominantly SiCN amorphous matrix containing disperse turbostratic carbon phase. The presence of carbon precursor (60 %wt) prevented the crystallization of the ceramic at 1500 oC, thus providing high thermal stability to the formed compound. Moreover, the samples displayed excellent oxidation results, which are attributed to the protection supplied by the carbon phase ceramic matrix. Therefore, the results suggest that this new compounded material is a promising alternative for high-temperature applications in oxidizing atmosphere.