Investigation On Kinetics Of Thermal Decomposition In Polysiloxane Networks Used As Precursors Of Silicon Oxycarbide Glasses

In this study, polysiloxane networks prepared by hydrosilylation or hydrolysis/condensation reactions were considered to be potential precursors for Si-C-O systems. Different precursors had different pyrolytic properties, which was essentially due to their molecular architecture. The kinetics parameters, such as the activation energy, E (kJ/mol) involved in the polymer-to-ceramic conversion, were investigated by thermogravimetry using a multiple heating rate kinetic method. The relationships between the molecular architecture and the precursor composition were compared to that of a linear poly(dimethylsiloxane) precursor. Solid-state 29Si nuclear magnetic resonance, infrared spectroscopies, density measurements, and X-ray diffraction measurements were made on the final samples. These products were typically amorphous, with a molecular structure formed by a random distribution of different silicon sites and variable amounts of free carbon residue. © 2002 Elsevier Science B.V. All rights reserved.3041-392100Riedel, R., (1996) Materials Science and Technology. A Comprehensive Treatment, 17, p. 1. , R.W. Cahn, P. Haasen, E.J. Kramer (Eds.), VCH, WeinheimBill, J., Aldinger, F., (1999) Precursor-Derived Ceramics: Synthesis, Structures, and High Temperature Mechanical Properties, p. 33. , J. Bill, F. Wakai, F. Aldinger (Eds.), Wiley-VCH, WeinheimGreil, P., (1995) J. Am. Ceram. Soc., 78, p. 835Renlund, G.M., Prochaska, S., Doremus, R.H., (1991) J. Mater. Res., 6, p. 2723Rouxel, T., Massouras, G., Sorarù, G.D., (1999) J. Sol-Gel Sci. Tech., 14, p. 87Kalfat, R., Babonneau, F., Gharbi, N., Zarouk, H., (1996) J. Mater. Chem., 6, p. 1673Liu, Q., Shi, W., Babonneau, F., Interrante, L.V., (1997) Chem. Mater., 9, p. 2434Radovanovic, E., Gozzi, M.F., Gonçalves, M.C., Yoshida, I.V.P., (1999) J. Non-Cryst. Solids, 248, p. 37Pantano, C.G., Singh, A.K., Zhang, H., (1999) J. Sol-Gel Sci. Tech., 14, p. 7Gozzi, M.F., Gonçalves, M.C., Yoshida, I.V.P., (1999) J. Mater. Sci., 34, p. 155Gozzi, M.F., Yoshida, I.V.P., (1997) Eur. Polym. J., 33, p. 1301Schiavon, M.A., Pardini, L.C., Yoshida, I.V.P., (2001) Key Eng. Mater., 189, p. 48Redondo, S.U.A., Radovanovic, E., Torriani, I.L., Yoshida, I.V.P., (2001) Polymer, 42, p. 1319Ozawa, T., (1965) Bull. Chem. Soc. Jpn., 38, p. 1881Thomas, T.H., Kendrick, T.C., (1969) J. Polym. Sci.: Part A-2, 7, p. 537Campostrini, R., D'Andrea, G., Carturan, G., Ceccato, R., Sorarù, G.D., (1996) J. Mater. Chem., 6, p. 585Çolak, N., Akgün, A., (1999) Polym. Plast. Technol. Eng., 38, p. 647Tutas, M., Saglam, M., Yüksel, M., Güler, Ç., (1987) Termochim. Acta, 111, p. 121Li, D., Hwang, S.-T., (1992) J. Appl. Polym. Sci., 44, p. 1979Michalczyk, M.J., Farneth, W.E., Vega, A.J., (1993) Chem. Mater., 5, p. 1687(1973) Powder Diffraction File Search Manual, , Joint Committee on Powder Diffraction Standarts, SwarthmoreHurwits, F.I., Meador, M.A.B., (1999) J. Sol-Gel Sci. Tech., 14, p. 75Camino, G., Lomakin, S.M., Lazzari, M., (2001) Polymer, 42, p. 2395Ikeda, M., Nakamura, T., Nagase, Y., Ikeda, K., Sekine, Y., (1981) J. Polym. Sci.: Polym. Chem. Ed., 19, p. 259