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High-ceramic-yield precursor to SiC-based ceramic: A hyperbranched polytitaniumcarbosilane bearing self-catalyzing units

Yu, Zhaoju and Yang, Le and Min, Hao and Zhang, Pei and Liu, Anhua and Riedel, Ralf (2015):
High-ceramic-yield precursor to SiC-based ceramic: A hyperbranched polytitaniumcarbosilane bearing self-catalyzing units.
In: Journal of the European Ceramic Society, 35 (2), Elsevier Science Publishing, pp. 851-858, ISSN 09552219,
[Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2014.09.009],
[Article]

Abstract

A novel hyperbranched polytitaniumcarbosilane (HPTiCS) was synthesized by a monomer route. The obtained HPTiCS contains dicyclopentadienyl titanium units, which exhibits excellent self-catalytic activation of the dehydrocoupling reaction during its cross-linking process. As a result, the 1200 °C ceramic yield of the pyrolyzed HPTiCS is 32 wt% higher than that of titanium-free hyperbranched hydridopolycarbosilane (HPCS). Compared with titanium-free HPCS-derived SiC, the resulting HPTiCS-derived SiC-based ceramic exhibits a significantly enhanced resistance toward the growth of the in situ formed β-SiC crystals as the matrix phase after being annealed at 1600 °C.

Item Type: Article
Erschienen: 2015
Creators: Yu, Zhaoju and Yang, Le and Min, Hao and Zhang, Pei and Liu, Anhua and Riedel, Ralf
Title: High-ceramic-yield precursor to SiC-based ceramic: A hyperbranched polytitaniumcarbosilane bearing self-catalyzing units
Language: English
Abstract:

A novel hyperbranched polytitaniumcarbosilane (HPTiCS) was synthesized by a monomer route. The obtained HPTiCS contains dicyclopentadienyl titanium units, which exhibits excellent self-catalytic activation of the dehydrocoupling reaction during its cross-linking process. As a result, the 1200 °C ceramic yield of the pyrolyzed HPTiCS is 32 wt% higher than that of titanium-free hyperbranched hydridopolycarbosilane (HPCS). Compared with titanium-free HPCS-derived SiC, the resulting HPTiCS-derived SiC-based ceramic exhibits a significantly enhanced resistance toward the growth of the in situ formed β-SiC crystals as the matrix phase after being annealed at 1600 °C.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 35
Number: 2
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Polymer-derived ceramic, Preceramic polymer, Hyperbranched polycarbosilane, Silicon carbide
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 08 Jan 2015 09:25
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2014.09.009
Identification Number: doi:10.1016/j.jeurceramsoc.2014.09.009
Funders: This research was supported by the NSFC (no. 50802079) and Natural Science Foundation of Fujian Province of China (no. 2011J01330), and Scientific and Technological Innovation Platform of Fujian Province (no. 2006L2003).
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