Structure and Properties of Ceramic Fibers Prepared From Polymeric Precursors [1]

Lipowitz, Jonathan; Freeman, Harvey A.; Goldberg, Harris A.; Chen, R. T.; Prack, Edward R.

doi:10.1557/proc-73-489

Cited by 13 publications

(12 citation statements)

References 6 publications

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“…A similar component was also reported recently. [15][16][17]19,22 A quantitative analysis of the components of the Si2p peak in the materials at different steps of the PMSQ heat treatment is given in Table III. It shows that two temperature domains correspond to important changes in the chemical composition of PMSQ: (i) T p Ͻ 500°C and (ii) T p Ͼ 500°C.…”

Section: Chemical Change During Pmsq Pyrolysismentioning

confidence: 99%

Pyrolysis of polymethylsilsesquioxane

Shi

et al. 2002

J of Applied Polymer Sci

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Changes of the composition and structure of various samples of polymethylsilsesquioxane (PMSQ), pyrolyzed at different temperatures under flowing nitrogen, were investigated using thermogravimetric analysis, Raman and Fourier transform infrared spectroscopies, X-ray photoelectron spectroscopy, elemental analysis, scanning electron microscopy, and transmission electron microscopy. The center of the Si2p peak could be used to estimate the extent of the pyrolysis of PMSQ. Two temperature domains correspond to important changes in the chemical composition of PMSQ. The former (T p Ͻ 500°C) is related to the conversion from a regular structure to an irregular structure and the latter (T p Ͼ 500°C) is associated with the organic-ceramic conversion. During the latter pyrolysis, flowing of the molten bulk occurred and then a final solid structure was obtained. The main product of PMSQ, pyrolyzed at 900°C, is silica, as well as some amount of silicon oxycarbide and traces of amorphous carbon. Based on the above analysis and observation, a conversion process from polysilsesquioxane to a ceramic is proposed.

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Section: Chemical Change During Pmsq Pyrolysismentioning

confidence: 99%

Pyrolysis of polymethylsilsesquioxane

Shi

et al. 2002

J of Applied Polymer Sci

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“…The low processing temperature involved in nonconventional routes to glasses and ceramics such as the sol-gel process and the polymer pyrolysis route permits the preparation of metastable phases that cannot be made by melting [1,2]. Thus, silicon oxycarbide glasses were obtained by pyrolysis at 900-1000~ in an inert atmosphere of precursors containing Si--O and Si--C bonds, such as polycarbosilanes cross-linked by siloxane bridges [2] or polyorganosiloxane gels [3][4][5][6][7][8][9], although the only stable phases in the SiC/Sit2 system are silicon carbide and silica.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, silicon oxycarbide glasses were obtained by pyrolysis at 900-1000~ in an inert atmosphere of precursors containing Si--O and Si--C bonds, such as polycarbosilanes cross-linked by siloxane bridges [2] or polyorganosiloxane gels [3][4][5][6][7][8][9], although the only stable phases in the SiC/Sit2 system are silicon carbide and silica. The practical interest of these materials arises from their increased thermochemical and thermomechanical stability compared to silica glasses.…”

Section: Introductionmentioning

confidence: 99%

Preparation and structure of silicon oxycarbide glasses derived from polysiloxane precursors

Corriu

Leclercq

Mutin

et al. 1997

J Sol-Gel Sci Technol

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Abstract. Silicon oxycarbide phases with different O/Si ratios were prepared by pyrolysis of highly cross-linked polysiloxane precursors. Their structure was investigated using quantitative 29Si solid-state NMR and X-ray photoelectron spectroscopy (XPS). The prominent part played by the redistribution reactions on the ceramic yield, the composition of the oxycarbide phases and their structure was illustrated. In a large range of compositions the oxycarbide phases formed by pyrolysis at moderate temperature (< 1000~ may be described as a purely random arrangement of CSi4 tetrahedra and Si--O--Si bridges.

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“…I), yielding scattered data [6][7][8][9][10][11][12][13][14]. This lack of coherence among reported data may be ascribed to the accuracy of the different techniques used, to compositional variations between the outer and inner regions of the fibres, and to compositional fluctuations during processing.…”

Section: Introductionmentioning

confidence: 99%