Yu, Zhaoju ; Min, Hao ; Yang, Le ; Feng, Yao ; Zhang, Pei ; Riedel, Ralf (2015):
Influence of the architecture of dendritic-like polycarbosilanes on the ceramic yield.
In: Journal of the European Ceramic Society, 35 (4), pp. 1161-1171. Elsevier Science Publishing, ISSN 09552219,
[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 ; Min, Hao ; Yang, Le ; Feng, Yao ; Zhang, Pei ; 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 of the journal: | 35 |
| Issue 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 |
| URL / URN: | http://dx.doi.org/10.1016/j.jeurceramsoc.2014.10.037 |
| Identification Number: | doi:10.1016/j.jeurceramsoc.2014.10.037 |
| PPN: | |
| 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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