Synthesis of cyano-polycarbosilane and investigation of its pyrolysis process
文献类型：期刊论文
| 作者 | Chen, Dou; Mo, Gaoming; Qian, Junmin; He, Liu; Huang, Qing; Huang, Zhengren |
| 刊名 | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
 |
| 出版日期 | 2020 |
| 卷号 | 40期号:15页码:5226-5237 |
| 关键词 | SILICON-CARBIDE FIBER POLYMER-DERIVED CERAMICS CROSS-LINKING HYDROSILYLATION CONVERSION TEMPERATURE PRECURSOR ACRYLONITRILE MECHANISMS |
| DOI | 10.1016/j.jeurceramsoc.2020.06.039 |
| 英文摘要 | Polycarbonsilane (PCS) is an important precursor of silicon carbide (SiC) fibers and ceramics. The ceramic yield of PCS is relatively low, about 60 %, which may bring some deficiencies in its applications. In this work, a novel precursor cyano-polycarbosilane (PCSCN) is synthesized by hydrosilylation reaction between PCS and acrylonitrile using a rhodium-containing catalyst, although acrylonitrile is generally not easy for hydrosilylation. After introducing tiny amounts of cyano (-C equivalent to N) groups into the PCS molecules, the ceramic yield of PCSCN can increase largely to over 80 %. The ceramization mechanism of PCSCN is investigated by FTIR, TG, XPS, ESR, NMR, Raman and XRD analyses. It is found that some crosslinking structures in PCSCN are formed between Si-H bonds and-C<^>N groups from about 200 degrees C, which can be responsible for the high ceramic yield. The existence of a little more N, O and free C elements in the pyrolysis products may inhibit the growth of crystalline beta-SiC. Moreover, the PCSCN precursor can also be melt-spun into continuous fibers by tailoring its molecular weight and softening point. The oxidized PCSCN fiber with relatively low oxygen content can be pyrolyzed without melting, and the final SiC fiber with an oxygen content as low as 8.5 % is obtained. |
| 学科主题 | Materials Science |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/20326]  |
| 专题 | 2020专题 2020专题_期刊论文 |
| 作者单位 | Mo, GM (corresponding author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Engn Lab Adv Energy Mat, Ningbo 315201, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Chen, Dou,Mo, Gaoming,Qian, Junmin,et al. Synthesis of cyano-polycarbosilane and investigation of its pyrolysis process[J]. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY,2020,40(15):5226-5237. |
| APA | Chen, Dou,Mo, Gaoming,Qian, Junmin,He, Liu,Huang, Qing,&Huang, Zhengren.(2020).Synthesis of cyano-polycarbosilane and investigation of its pyrolysis process.JOURNAL OF THE EUROPEAN CERAMIC SOCIETY,40(15),5226-5237. |
| MLA | Chen, Dou,et al."Synthesis of cyano-polycarbosilane and investigation of its pyrolysis process".JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 40.15(2020):5226-5237. |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
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