AbstractSilicon oxycarbide glasses (SiOC) are a class of amorphous materials with a similar silica glass structure, in which oxygen atoms are partially replaced by tetracoordenated carbon atoms. The presence of carbon atoms covalently bound to the silicon atoms creates a more interconnected structure with better strength, and excellent chemical stability than conventional silica. SiOCs are easily prepared by the pyrolysis of polysiloxanes and can potentially be implemented in several technological applications that require high temperatures. This paper mainly addresses the preparation, structure, and properties of SiOC. Furthermore, potential applications of SiOC are also introduced.

RESUMO: Blendas poliméricas constituídas de polímeros de silício e poliestireno, PS, foram investigadas por microscopia eletrônica de varredura, SEM, e análise dinâmico-mecânica, DMA. As misturas com poli(tetrametilsilfenileno-siloxano), PTMPS, ricas em PS, tiveram sua morfologia caracterizada por domínios globulares de PTMPS dispersos na matriz de poliestireno. Uma morfologia típica de inversão de fases foi observada para a blenda PS/PTMPS 50/50. Constatou-se miscibilidade para as blendas de PS com poli(dimetilsilfenileno), PDSP, em todas as composições estudadas.

ABSTRACT: Blends of organosilicon polymers with polystyrene, PS, were investigated by scanning electron microscopy, and dynamical mechanical analysis. Blends with poly(tetramethylsilphenylene-siloxane), PTMPS, had a morphology characterized by globular domains dispersed in the polystyrene matrix, when the PS content was high. A morphology typical of phase inversion was observed for the 50/50 PS/PTMPS blend. An apparent miscibility was observed when PS was mixed with poly(dimethylsilphenylene), PDSP, in all compositions under study.