Structural Characterization of Sol-Gel Derived Oxycarbide Glasses. 1. Study of the Pyrolysis Process

Bois, Laurence; Maquet, Jocelyne; Babonneau, Florence; Mutin, P. Hubert; Bahloul, Djamilha

doi:10.1021/cm00042a016

Cited by 144 publications

(113 citation statements)

References 8 publications

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“…The relative amounts of the gaseous products are virtually independent of photolysis progress ( Fig. 1) and are in line with combination (Eqn [3]), disproportionation (Eqn [4]), cross-disproportionation (Eqn [5]) and hydrogen-abstraction reactions (Eqn [6]) of H 2 C=CH . and CH 3 .…”

Section: Resultssupporting

confidence: 52%

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UV‐laser‐induced photolysis of trimethyl(vinyloxy)silane for chemical vapour deposition of polysiloxane films

Ouchi¹,

Koga²,

Bastl

et al. 1999

Applied Organom Chemis

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The UV‐induced photolysis of trimethyl(vinyloxy)silane (TMVSi) induced by ArF laser, affording a multitude of unsaturated hydrocarbons and a solid polydimethylsiloxane, represents a convenient process of chemical vapour deposition in which the silicon of the parent is almost completely utilized for the formation of the solid phase and in which the morphology and composition of the films is affected by the configuration of the substrate and laser beam. Copyright © 1999 John Wiley & Sons, Ltd.

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Section: Resultssupporting

confidence: 52%

“…Refs. [1][2][3][4] and find use in ceramic sensors for oxygen detection in high-temperature corrosive conditions and in photodetectors and solar cells. 5,6 Different kinds of these Si/C/O and Si/C/H/O materials are known: black glasses have been prepared by pyrolysis of polysiloxane gels (e.g.…”

Section: Introductionmentioning

confidence: 99%

UV‐laser‐induced photolysis of trimethyl(vinyloxy)silane for chemical vapour deposition of polysiloxane films

Ouchi¹,

Koga²,

Bastl

et al. 1999

Applied Organom Chemis

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“…Silicon-containing polymers have been attracting much interest because of their unique thermal, mechanical, and optoelectrical properties as well as the pyrolytic behavior, and various kinds of siliconbased polymers have been widely studied for about 30 Several types of thermally stable polymers such as polysiloxanes, polysilazanes, poly-(silarylene)s, and their copolymers, have already been developed. Polysiloxanes and their derivatives reported so far include poly( diarylsiloxane)s,'-6 poly(phenylsilsesquioxane)~~g silarylene-siloxane polymers,10-12 poly(oxyarylenesiI~xane)s,~~J~ polysiloxanes with a ring structure in the repeating units.…”

Section: Introductionmentioning

confidence: 99%

Poly(diarylsilmethylene)s, II. Thermal and mechanical properties1

Ogawa

Murakami

1996

J. Polym. Sci. B Polym. Phys.

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Thermal and mechanical properties of poly(diarylsilmethylene)s (PDArSMs) with phenyl, m‐tolyl or p‐tolyl substituents on Si atoms were investigated. According to the TG‐DTA, poly(diphenylsilmethylene) (PDPSM) remained almost unchanged in weight up to about 400°C, and showed two‐step weight loss in the temperature range between ca. 400 and 700°C in an air atmosphere. The first decomposition step seems assignable to elimination of aryl groups while the second one is presumably due to oxidative decomposition which is evident from a large exothermic peak in the DTA trace. Thermostability of PDArSMs with tolyl groups were comparable to that of PDPSM when the measurement was conducted under nitrogen, whereas the polymers having tolyl substituents were highly thermally unstable in air compared with PDPSM. These polymers exhibited a gain in weight accompanied with a violent exothermic reaction in the early stage of thermal decomposition in air. This thermal instability of the tolyl‐substituted polymers can be explained by high sensitivity of the tolyl groups toward oxidative decomposition. Analysis of pyrolyzed products of PDArSMs suggested that these polymers underwent radical cleavage of Si‐aryl bonds to provide network materials which can be precursors for Si‐containing ceramics. Mechanical properties of PDPSM are also discussed. © 1996 John Wiley & Sons, Inc.

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“…8(b)). The density of pyrolyzed samples is 1.4-1.5 g/cm 3 and geometric density is close to 1.5-1.6 g/cm 3 . Compared to the density values reported in the existing literatures for SiOC [29][30][31], the observed density is lower for the cold pressed and pyrolysed SiOC.…”

Section: Bulk Compactsmentioning

confidence: 73%

“…Silicon oxycarbide ceramic (SiOC) processed through polymer precursors is one of the widely studied systems due to its attractive thermo-mechanical properties [1][2][3][4][5][6]. This is attributed to the replacement of a part of its divalent oxygen atoms by the tetravalent carbon atoms, resulting in a stronger 3-dimensional network in contrast to silica, thereby enhancing the potential of the material [7].…”

Section: Introductionmentioning

confidence: 99%

Processing and characterization of polymer precursor derived silicon oxycarbide ceramic foams and compacts

2013

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This work focused on the fabrication of silicon oxycarbide ceramic (SiOC) foams as well as dense compacts using poly(hydridomethylsiloxane) (PHMS) as a polymer precursor. The room-temperature cross-linking of PHMS was achieved by the addition of 1,4-diazabicyclo [2.2.2] octane (DABCO) with the release of hydrogen gas as a by-product. This resulted in self-blowing of the polymer precursor at room temperature and thereby offered the possibility of producing SiOC foams without the need of any external blowing agents. We also reported the fabrication of crack-free silicon oxycarbide compacts by cold compaction and pyrolysis route using polyvinyl alcohol (PVA) as a processing additive. Cylindrical-shaped pellets were pyrolysed at 1300 ℃ in argon atmosphere with a ceramic yield of approximately 85%. Increased resistance to phase separation and crystallization up to 1400 ℃ was attributed to the presence of large volume fraction of free carbon in the material which was confirmed by Raman spectroscopy.

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Structural Characterization of Sol-Gel Derived Oxycarbide Glasses. 1. Study of the Pyrolysis Process

Cited by 144 publications

References 8 publications

UV‐laser‐induced photolysis of trimethyl(vinyloxy)silane for chemical vapour deposition of polysiloxane films

UV‐laser‐induced photolysis of trimethyl(vinyloxy)silane for chemical vapour deposition of polysiloxane films

Poly(diarylsilmethylene)s, II. Thermal and mechanical properties1

Processing and characterization of polymer precursor derived silicon oxycarbide ceramic foams and compacts

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