Oxidation Reaction of Polycarbosilane

Ichikawa, Hideyuki; Machino, F.; Teranishi, Hiroshi; Ishikawa, Toshihiro

doi:10.1021/ba-1990-0224.ch034

Cited by 8 publications

(4 citation statements)

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“…When only SMP10 is added, MWCNTs decompose at a higher temperature between 450 °C-600 °C with a residue mass of 36.5%. This is attributed to the presence of polycarbosilane that undergoes an oxidation process forming infusible Si-Cx-Oy as described previously [29,30]. With the addition of 290 ppm of Pt(0), red line, the residues mass increases to 49% with a shift of the oxidation process at even higher temperatures between 510 and 640 °C.…”

Section: Analysis Of the Suspension Parameterssupporting

confidence: 61%

Rapid carbon nanotubes suspension in organic solvents using organosilicon polymers

Dalcanale

Grossenbacher

Blugan

et al. 2016

Journal of Colloid and Interface Science

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A strategy for a simple dispersion of commercial multi-walled carbon nanotubes (MWCNTs) using two organosilicones, polycarbosilane SMP10 and polysilazane Ceraset PSZ20, in organic solvents such as cyclohexane, tetrahydrofuran (THF), m-xylene and chloroform is presented. In just a few minutes the combined action of sonication and the presence of Pt(0) catalyst is sufficient to obtain a homogeneous suspension, thanks to the rapid hydrosilylation reaction between SiH groups of the polymer and the CNT sidewall. The as-produced suspensions have a particle size distribution <1μm and remain unchanged after several months. A maximum of 0.47 and 0.50mg/ml was achieved, respectively, for Ceraset in THF and SMP10 in chloroform. Possible applications as polymeric and ceramic thin films or aerogels are presented.

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Section: Analysis Of the Suspension Parameterssupporting

confidence: 61%

Rapid carbon nanotubes suspension in organic solvents using organosilicon polymers

Dalcanale

Grossenbacher

Blugan

et al. 2016

Journal of Colloid and Interface Science

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“…Okamura (8) proposed a model of the molecular structure of PCS. The characteristics of PCS are as follows: the density D 4 25 is 1.116; the melting point is 194 • C; and the average molecular weights, Mn and Mw (g/mol), are 1,470 and 2,980, respectively (9). The molecular weights of PCS are between 500 and 30,000.…”

Section: Synthesis Of Polycarbosilanementioning

confidence: 99%

Polymer-Derived Ceramic Fibers

Ichikawa

2016

Annu. Rev. Mater. Res.

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SiC-based ceramic fibers are derived from polycarbosilane or polymetallocarbosilane precursors and are classified into three groups according to their chemical composition, oxygen content, and C/Si atomic ratio. The first-generation fibers are Si-C-O (Nicalon) fibers and Si-Ti-C-O (Tyranno Lox M) fibers. Both fibers contain more than 10-wt% oxygen owing to oxidation during curing and lead to degradation in strength at temperatures exceeding 1,300°C. The maximum use temperature is 1,100°C. The second-generation fibers are SiC (Hi-Nicalon) fibers and Si-Zr-C-O (Tyranno ZMI) fibers. The oxygen content of these fibers is reduced to less than 1 wt% by electron beam irradiation curing in He. The thermal stability of these fibers is improved (they are stable up to 1,500°C), but their creep resistance is limited to a maximum of 1,150°C because their C/Si atomic ratio results in excess carbon. The third-generation fibers are stoichiometric SiC fibers, i.e., Hi-Nicalon Type S (hereafter Type S), Tyranno SA, and Sylramic™ fibers. They exhibit improved thermal stability and creep resistance up to 1,400°C. Stoichiometric SiC fibers meet many of the requirements for the use of ceramic matrix composites for high-temperature structural application. SiBN3C fibers derived from polyborosilazane also show promise for structural applications, remain in the amorphous state up to 1,800°C, and have good high-temperature creep resistance.

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“…This phenomenon can be explained by the reactions between OH and carbon-containing groups with either oxygen or H 2 O to produce 'SiOOH. 28 Then, oxygen can enter the polymer backbone, via reactions (4) or (5):…”

Section: (1) Pyrolysis and Ammonia Treatmentmentioning

confidence: 99%

Effect of Ammonia Treatment on the Crystallization of Amorphous Silicon–Carbon–Nitrogen Ceramics Derived from Polymer Precursor Pyrolysis

Wan

Gasch

Mukherjee

2002

Journal of the American Ceramic Society

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An effort was made toward modifying the Si 3 N 4 -SiC phase ratio in bulk nanocomposites obtained from polymer precursors. While pyrolyzing the polymer, flowing ammonia was introduced, to facilitate a chemical exchange, resulting in a different C/N ratio in the ceramic pyrolysis product. A prepyrolysis/binding/pyrolysis approach was used for sample consolidation. Comparison was made between the crystallization behavior of the pyrolysis-derived ceramic powders and consolidated bulk samples. A profound enhancement in crystallization tendency was observed in the consolidated samples whose nitrogen content was increased by ammonia treatment. A mechanism based on the particle/binder interface energy was proposed to account for this observation.

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Oxidation Reaction of Polycarbosilane

Cited by 8 publications

References 0 publications

Rapid carbon nanotubes suspension in organic solvents using organosilicon polymers

Rapid carbon nanotubes suspension in organic solvents using organosilicon polymers

Polymer-Derived Ceramic Fibers

Effect of Ammonia Treatment on the Crystallization of Amorphous Silicon–Carbon–Nitrogen Ceramics Derived from Polymer Precursor Pyrolysis

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