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Synthesis of polymeric precursors for the formation of nanocrystalline Ti‐C‐N/amorphous Si‐C‐N composites
Author(s) -
Hering Nicole,
Schreiber Kai,
Riedel Ralf,
Lichtenberger Olaf,
Woltersdorf Jörg
Publication year - 2001
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.241
Subject(s) - trimethylsilyl , chemistry , nanocrystalline material , raman spectroscopy , ceramic , amorphous solid , chemical engineering , infrared spectroscopy , amorphous carbon , polymer chemistry , composite material , organic chemistry , materials science , crystallography , physics , optics , engineering
Abstract The synthesis of trimethylsilyl‐substituted poly(titaniumcarbodiimide) as a novel precursor for titanium carbonitride based ceramic materials is described. The precursor and the subsequent processing steps (cross‐linking and pyrolysis) are characterized by IR and Raman spectroscopy, thermal gravimetric analysis and simultaneous mass spectroscopy, electron microscopy and powder X‐ray diffraction measurements. The novel polymer is formed by the reaction of TiCl 4 or Ti(NEt 2 ) 4 with bis(trimethylsilyl)carbodiimide. Subsequent pyrolysis at 1000 °C in argon results in the formation of a ceramic composite material consisting of nanocrystalline TiCN and amorphous SiCN as constituting phases. Using Ti(NEt 2 ) 4 as a starting reagent instead of TiCl 4 , chlorine contamination of the ceramic material can be avoided. The different molecular vibration modes of the metal–nitrogen, metal–carbon and nitrogen–carbon bonds in poly(titaniumcarbodiimides) with trimethylsilyl substituents were calculated using quantum mechanical methods, providing a comprehensive understanding of the measured spectra. Copyright © 2001 John Wiley & Sons, Ltd.