Molecular structure of preceramic nanozirconooligocarbosilanes

Щербакова, Г. И.; Стороженко, П. А.; Сидоров, Д. В.; Blokhina, M. Kh.; Кузнецова, М. Г.; Polyakova, M. V.; Chernyshev, A. E.; Yurkov, G. Yu.

doi:10.1134/s0020168511040182

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…In the present case, however, the reaction begins in the solution at room temperature, so the stronger is ionicity of bonds and groups, the more likely they interact. The interaction of OCS and tetrakis-(diethylamino) zirconium has been studied in detail [27,28] However, the TEM study of ZrCS has showed that a portion of zirconium is in the form of 5-10 nm nanoparticles uniformly distributed across the entire space of the sample and surrounded by a polymer matrix [27,28]. Co-condensation of OCS with hafnium, tantalum alkyl amides is similar to that of OCS with Zr[N(C 2 H 5 ) 2 ] 4 .…”

Section: Interaction Of Zirconium Hafnium Tantalum Alkyl Amides Witmentioning

confidence: 99%

Nanometallocarbosilanes: Synthesis, Physicochemical Properties and Structure

Щербакова¹,

Стороженко²,

Blokhina³

et al. 2014

JCCE

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Abstract:Highly efficient synthesis methods have been developed and characteristics of nanometallocarbosilanes molecular structure were studied by the research team of GNIIChTEOS (State Research Institute for Chemistry and Technology of Organoelement Compounds). Nanometallocarbosilanes were synthesized by thermal co-condensation of oligocarbosilanes and alkyl amides of refractory metals. Initial, intermediate and final products of side reactions were characterized by 1 H, 13 C, 29 Si NMR (nuclear magnetic resonance), IR (infra-red) spectroscopy, GPC (gel-penetrating chromatography), TGA (thermal gravimetric analysis), TEM (transmission electron microscopy), SEM (scanning electron microscopy), RES (X-ray phase analysis) and elemental analysis. The proposed synthesis method of nanometallocarbosilanes was found to produce fusable soluble organosilicon oligomers with homogeneous distribution of nanoscale (10-20 nm) metal particles in the oligomer matrix. A computational model of the group and elemental composition of nanometallocarbosilanes was developed; it was shown that they are molecular globules of near-spherical shape and rigid polycyclic structure. Thermochemical treatment of nanometallocarbosilanes leads to SiC-nanoceramics (a high yield of up to 75-80 mass%) modified by metal nanoparticles (20-30 nm) contributing to its stabilization. The application of preceramic oxygen-free nanometallocarbosilanes will make it possible to advance in solving the problem of ceramic composite materials with long-term resistance at temperatures above 1,500 °C in oxidizing environments.

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