Ceramics Derived From Hybrid Polymer And Multiwall Carbon Nanotubes

Abstract

Ceramic samples (labelled NT and CS) were obtained from a hybrid polymeric precursor derived from poly(methylsiloxane) and divinylbenzene with and without carbon nanotubes (MWCNT), respectively, as an additional C-source. The precursor was pyrolysed under Ar atmosphere at 1500 °C for different pyrolysis times. XRD patterns of CS ceramics showed broad diffractions of β-SiC, C-graphitic and opaline-SiO2 phases. For NT ceramics, besides the diffractions observed for CS ceramics, an intense diffraction peak of cristobalite was observed. The introduction of MWCNT changed the morphology of the resulting ceramics and decreased the solubility of SiO2 in the matrix, promoting the formation of relatively large cristobalite crystals.Schiavon, M.A., Redondo, S.U.A., Pina, S.R.O., Yoshida, I.V.P., Investigation on kinetics of thermal decomposition in polysiloxane networks used as precursors of silicon oxycarbide glasses (2002) Journal of Non-Crystalline Solids, 304, pp. 92-100Kleebe, H.-J., Gregori, G., Babonneau, F., Blum, Y.D., MacQueen, D.B., Masse, S., Evolution of c-rich sioc ceramics. Part I. Characterization by integral spectroscopic techniques: Solid-state nmr and raman spectroscopy (2006) International Journal of Materials Research, 97, pp. 699-709Pinho, R.O., Radovanovic, E., Torriani, I.L., Yoshida, I.V.P., V, P.I., Hybrid materials derived from divinylbenzene and cyclic siloxane (2004) European Polymer Journal, 40, pp. 615-622Tuinstra, F., Koenig, J.L., Raman spectrum of graphite (1970) Journal of Chemical Physics, 53, pp. 1126-1130Li, F., Wen, G., Song, L., Growth of nanowires from annealing sibonc nanopowders (2006) Journal of Crystal Growth, 290, pp. 466-472Graetsch, H., Gies, H., Topalovié, I., Nmr, xrd and ir study on microcrystalline opals (1994) Physics and Chemistry of Minerals, 21, pp. 166-175Bois, L., Maquet, J.J., Babonneau, F., Structural characterization of sol-gel derived oxycarbide glasses 2. study of the thermal stability of the silicon oxycarbide phase (1995) Chemistry of Materials, 7, pp. 975-98