The conversion process from polydimethylsilane to polycarbosilane in the presence of polyborodiphenylsiloxane

Ishikawa, Toshihiro; Shibuya, Masaki; Yamamura, Tsutomu

doi:10.1007/bf00584885

Cited by 39 publications

(16 citation statements)

References 4 publications

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“…The signals detected after 17.3 min r.t. represent the by-products (Fig. 4) [13,41,42]. The GPC result confirms that the PPCS also follows a step-growth polymerization like that of PCS.…”

Section: Resultssupporting

confidence: 84%

Step-Growth Polymerization of Poly(phenylcarbosilane) and Its Structural and Physical Properties

Lee

Kim

et al. 2011

J Inorg Organomet Polym

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The polymerization and molecular weight distribution of poly(phenylcarbosilane) (PPCS) depend on the temperature and pressure conditions under which it is synthesized using the Kumada rearrangement reaction. Its degree of polymerization is related not only to its physical properties such as solubility and boiling point but also to its chemical structure. In this study, soluble PPCS having a weight-average molecular weight (Mw) in the range of 2,500-3,000 was selectively isolated through distillation or fractional precipitation, and its chemical structure and physical properties were studied via FT-IR, NMR, GPC, and thermal analysis. The analytical data indicate that the Si-CH 2 -Si backbone and Si-Si bond are formed through step-growth polymerization and are clearly detected after purification. The differences in the thermal behavior of PPCS in air and in nitrogen were also investigated.

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“…The signals detected after 17.3 min r.t. represent the by-products (Fig. 4) [13,41,42]. The GPC result confirms that the PPCS also follows a step-growth polymerization like that of PCS.…”

Section: Resultssupporting

confidence: 84%

Step-Growth Polymerization of Poly(phenylcarbosilane) and Its Structural and Physical Properties

Lee

Kim

et al. 2011

J Inorg Organomet Polym

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“…This would corroborate publications of Ishikawa and Hasegawa and their co-workers, who suggested that boron catalysts facilitate dehydrogenation reactions and not the Kumada transformation. 39,42,43 However, we have no explanations for why the catalyst is not reactivated in our system once new SiH groups are formed. It would thus appear that the difference between the PDMS studied by Ishikawa and PMSbased precursors studied here is related to the reactivity of the Si-H bonds of the polymers.…”

Section: Kumada Rearrangementmentioning

confidence: 79%

Stoichiometric silicon carbide from borate‐catalyzed polymethylsilane–polyvinylsilane formulations

Boury

Bryson²,

Soula³

1999

Appl. Organometal. Chem.

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Polymethylsilane (PMS) and polyvinysilane (PVS) were prepared by Wurtz condensation of chlorosilanes and characterized by spectroscopy (1H, 13C and 29Si NMR, and infrared), viscosity and GPC analysis. Mixtures of the PMS and PVS were prepared and stabilized with 2,6‐di‐t‐butyl‐4‐methylphenol (BHT; 0.5 wt%) to which was added a catalytic amount of tris(trimethylsilyl)borate, B(OSiMe3)3 (BTMS; 2 wt% by weight). The resulting liquid materials were pyrolyzed to 950 °C and to 1400 °C under argon. The formulation, composed of 60% PMS / 40% PVS / 2% BTMS, was pyrolyzed and gives nearly stoichiometric silicon carbide in 73% yield. The pyrolyzate was analyzed spectroscopically at intermediate stages in order to study its thermal transformations and the influence of the boron catalyst. The ceramic obtained from the formulation 60% PMS / 40% PVS / 2% BTMS shows good stability at 1500 °C under oxygen. Copyright © 1999 John Wiley & Sons, Ltd.

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“…The absorptions peaks are compared to literature values and listed in Table 2. 10, 16 The most important feature is the peak near 800 cm -1 , which can be assigned to the Si-C stretching mode. In addition, the absorptions assignable to Si-CH 2 -Si vibrations are found near 1020 and 1360 cm -1 while Si-H stretching is observed near 2100 cm -1 .…”

Section: Characterizations Of Ceramic Precursorsmentioning

confidence: 99%

Silicon Carbide Nanostructures from Reactions between Vapors of Organochlorosilanes and Liquid of Sodium‐Factors Affecting Morphology and Composition

Wang

Liu

Lee

et al. 2007

J Chinese Chemical Soc

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Cubic shells and spherical nanoparticles of β‐SiC were produced at 1273 K by processing the ceramic precursors formed from the reactions between vapors of organochlorosilanes, Me2SiCl2, MeSiCl3, MeSiHCl2, and PhSiCl3, and liquid Na at 523‐723 K. From Me2SiCl2, a flexible linear polycarbosilane precursor was synthesized and covered the NaCl byproduct surface to form a cubic shape. Hollow cubic β‐SiC shells were produced after the NaCl templates were removed. From MeSiCl3, a rigid cross‐linked polycarbosilane was produced and phase segregated from the NaCl byproduct. The precursor was transformed into nanoparticles without special morphology. MeSiHCl2 produced a cross‐linked polysilane precursor at low temperatures, which can be converted into a mixture of β‐SiC and Si nanoparticles. At high temperatures, the polysilane converted to polycarbosilane and produced hollow cubic β‐SiC shells. The carbon‐rich PhSiCl3 generated cube‐like particles as the final product, which contained β‐SiC and carbon.

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The conversion process from polydimethylsilane to polycarbosilane in the presence of polyborodiphenylsiloxane

Cited by 39 publications

References 4 publications

Step-Growth Polymerization of Poly(phenylcarbosilane) and Its Structural and Physical Properties

Step-Growth Polymerization of Poly(phenylcarbosilane) and Its Structural and Physical Properties

Stoichiometric silicon carbide from borate‐catalyzed polymethylsilane–polyvinylsilane formulations

Silicon Carbide Nanostructures from Reactions between Vapors of Organochlorosilanes and Liquid of Sodium‐Factors Affecting Morphology and Composition

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