Porous ceramic materials from polysiloxane-clay composites

Journal of the Brazilian Chemical Society

Silva, Viviane P.¹  Yoshida, Inez V. P.¹  Segatelli, Mariana G.¹  Kaneko, Manuela L. Q. A.¹  University of Campinas, Campinas, Brazil¹  University of Londrina, Londrina, Brazil¹ 

关键词: polysiloxane;    ceramic matrix composites;    clay;    pyrolysis.;   

DOI  :  10.5935/0103-5053.20140025

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

This study describes the structural, porosity and morphological changes of porous polymer-derived ceramics obtained by pyrolysis of polysiloxane-clay composites, containing a pore former based on poly(dimethylsiloxane) and nickel acetate as nanostructure inductor. The composites were blended in a steel mold, thermally treated at 950 °C and 1500 °C (inert atmosphere). The increase of the temperature together with the presence of Ni resulted in more crystalline and porous ceramics and a higher ordering process of Cfree phase in the Ni-containing sample. The ceramics revealed a wide pore size distribution, from micro to macropores. At 950 °C the ceramic revealed the presence of pores and Ni- and C-rich islands dispersed on the fracture surface. However, at 1500 °C, nanowires with large aspect ratio, constituted by Si, C and O elements were generated. Thus, the presence of Ni associated to higher pores amount gave rise to an appropriate environment for the nucleation and growth of SiCO nanowires.

【 授权许可】

Unknown