Alkyl- and arylsilsesquiazanes: effect of the R group on polymer degradation and ceramic char composition

Burns, Gary T.; Angelotti, Timothy; Hanneman, Larry F.; Chandra, G.; Moore, J. A.

doi:10.1007/bf01082152

Cited by 44 publications

(18 citation statements)

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“…Trichlorosilanes yield highly branched polysilsesquiazanes. [116][117][118] The properties of the resulting polymers and that of the final ceramics can also be influenced by the organic substituents attached to nitrogen in the case the polycondensation is performed by aminolysis with different alkylamines. Illustrative examples are the very recently published results on ammonolysis and aminolysis of dichlorosilanes, 119 as presented in Scheme 2.…”

Section: 113-115mentioning

confidence: 99%

Silicon-Based Polymer-Derived Ceramics: Synthesis Properties and Applications-A Review

Riedel

Mera

Hauser

et al. 2006

Nippon Seramikkusu Kyokai gakujutsu ronbunshi

408

316

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Section: 113-115mentioning

confidence: 99%

Silicon-Based Polymer-Derived Ceramics: Synthesis Properties and Applications-A Review

Riedel

Mera

Hauser

et al. 2006

Nippon Seramikkusu Kyokai gakujutsu ronbunshi

408

316

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“…[63][64][65][66][67] If the temperature is raised to 1050°C these reactions proceed further, finally resulting in the formation of tetrahedral CSi 4 structural units:…”

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confidence: 99%

“…13 If the temperature is raised further the formation of Si-H and sp Investigations on model compounds suggest that this reaction is initiated by the homolytic cleavage of Si-C bonds followed by the b-elimination of a hydrogen radical. 63 Subsequent reaction of the Si-H units according to Eqn [7] around 500°C leads to Si-N bonds. As a result, Si-C bonds present in the preceramic polymer are quantitatively cleaved along with formation of Si-N bonds, yielding an amorphous ceramic solid at 1050°C that is built up by SiN 4 groups.…”

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confidence: 99%

Precursor‐derived Si–(B–)C–N ceramics: thermolysis, amorphous state and crystallization

Bill

Kamphowe

Müller

et al. 2001

Applied Organom Chemis

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The preparation of silicon nitride-and carbidebased ceramics by solid-state thermolysis of polysilazanes and polysilylcarbodiimides is described. Results on the ceramization of the preceramic compounds and the architecture of the corresponding amorphous states obtained by spectroscopic means and by X-ray and neutron scattering are reviewed. Fundamental correlations between the composition and structure of the preceramic compounds and the architecture of the amorphous state are revealed. Furthermore, the crystallization behavior of the amorphous precursor-derived Si-C-N ceramics is treated. Moreover, the influence of boron on the thermal stability of the amorphous state is described. The high-temperature behavior of these Si-B-C-N solids can be correlated with their phase composition. Ceramic materials with compositions located close to the three-phase equilibrium SiC BN C exhibit a high temperature stability up to 2000°C. This effect is accompanied by the formation of a metastable solid consisting of Si 3 N 4 and SiC nanocrystals that are embedded in a turbostratic B-C-N matrix phase. Based on thermodynamic considerations, a model for the high-temperature stability effect is proposed.

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“…25,52 The radicals R ഊ can react with SiH bonds to form silicon radicals Si ഊ via hydrogen abstraction. 53,54 Scheme 2A In the…”

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confidence: 99%

Preparation of Si-Al-N-C Ceramic Composites by Pyrolysis of Blended Precursors

Mori

Ueda

Kitaoka

et al. 2006

J. Ceram. Soc. Japan

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ɞɴɻɑ֭‫د‬Χǽᡡո╫ǺȗȚ Si-Al-N-C ɃɱɧɋȷȻɻɥɀɋɐǽΰ⓯ ᎓ ؊͒ɿᎧᨀᓽ۠ɿ‫ل‬ ☶ଉ ɿ≐‫ڤ‬ῲ˴ ᅤᨀগકᥴకકȤඅ᧸‫ك‬કᲇࢫ169-8555 ኇ̸ȩᄽٚগ˳Є 3-4-1 ଉ ⛥ɝȩȬɻɃɱɧɋȷɁɃɻɇʀࢫ456-8587 ۵‫ୖے‬లᡡᨀٚӹʅ 2-4-1Si-Al-N-C precursors have been prepared from perhydropolysilazane PHPS and cage-type polyethyliminoalane =HAlNEt n ; PEIA, n is mainly 8? with different SiAl molar ratios SiAlࢼ3, 1, 13. Spectroscopic analysis indicates that essentially no Si-N-Al linkages form, indicating that the precursors are blended polymers. TG analysis reveals that the ceramic yields of the blended precursors up to 900c C are higher than those of PHPS and HAlNEt n , suggesting that cross-linking reactions occur during pyrolysis. Possible reactions are dehydrocoupling and radical reactions, as suggested by the results of solid-state nuclear magnetic resonance NMR spectroscopy. The results of solid-state NMR spectroscopy and X-ray diffraction XRD analysis indicate that the residue pyrolyzed at 1600c C contains mainly crystalline AlN, 2H-SiC and b-SiC.

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Alkyl- and arylsilsesquiazanes: effect of the R group on polymer degradation and ceramic char composition

Cited by 44 publications

References 2 publications

Silicon-Based Polymer-Derived Ceramics: Synthesis Properties and Applications-A Review

Silicon-Based Polymer-Derived Ceramics: Synthesis Properties and Applications-A Review

Precursor‐derived Si–(B–)C–N ceramics: thermolysis, amorphous state and crystallization

Preparation of Si-Al-N-C Ceramic Composites by Pyrolysis of Blended Precursors

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