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Influence of the architecture of dendritic-like polycarbosilanes on the ceramic yield

Yu, Zhaoju and Min, Hao and Yang, Le and Feng, Yao and Zhang, Pei and Riedel, Ralf (2015):
Influence of the architecture of dendritic-like polycarbosilanes on the ceramic yield.
In: Journal of the European Ceramic Society, 35 (4), Elsevier Science Publishing, pp. 1161-1171, ISSN 09552219,
[Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2014.10.037],
[Article]

Abstract

To investigate the influence of the architecture of preceramic polymers on the ceramic yield, two dendritic-like polycarbosilanes named as K3G3 and G3 were synthesized through different routes. The obvious difference in their molecular structures is related with the distribution of allyl groups. The decomposition and rearrangement reactions of the K3G3 occurred at lower temperatures compared with that of sample G3, due to the fact that the allyl groups in G3 are located in both inner and outer molecular layers while those in K3G3 are located in the outer layers, exclusively. As a result, the residual mass of the K3G3 at 1000 °C (18 wt%) is much lower than that of the G3 sample (35 wt%). The molecular weight of the dendritic-like polymers also has an important effect on their ceramic yield which increases from 34.6 to 67.6% with the increasing molecular weight of Gn (3 ≤ n ≤ 5).

Item Type: Article
Erschienen: 2015
Creators: Yu, Zhaoju and Min, Hao and Yang, Le and Feng, Yao and Zhang, Pei and Riedel, Ralf
Title: Influence of the architecture of dendritic-like polycarbosilanes on the ceramic yield
Language: English
Abstract:

To investigate the influence of the architecture of preceramic polymers on the ceramic yield, two dendritic-like polycarbosilanes named as K3G3 and G3 were synthesized through different routes. The obvious difference in their molecular structures is related with the distribution of allyl groups. The decomposition and rearrangement reactions of the K3G3 occurred at lower temperatures compared with that of sample G3, due to the fact that the allyl groups in G3 are located in both inner and outer molecular layers while those in K3G3 are located in the outer layers, exclusively. As a result, the residual mass of the K3G3 at 1000 °C (18 wt%) is much lower than that of the G3 sample (35 wt%). The molecular weight of the dendritic-like polymers also has an important effect on their ceramic yield which increases from 34.6 to 67.6% with the increasing molecular weight of Gn (3 ≤ n ≤ 5).

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 35
Number: 4
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Polymer-derived ceramics, Dendritic polycarbosilanes, Silicon carbide, Polymeric architecture, Ceramic yield
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: 25 Mar 2015 09:34
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2014.10.037
Identification Number: doi:10.1016/j.jeurceramsoc.2014.10.037
Funders: This research was supported by the NSFC (No. 50802079) and Natural Science Foundation of Fujian Province of China (No. 2011J01330), Scientific and Technological Innovation Platform of Fujian Province (2006L2003).
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