Polymerization of methylsilylenes into polymethylsilanes or polycarbosilanes after dechlorination of dichloromethylsilanes?
文献类型：期刊论文
| 作者 | Tian, Yuelong1,2; Zhang, Weigang1; Ge, Min1; Yu, Shouquan1; Lv, Xiaoxu1,2; Zhang, Tingting1,2 |
| 刊名 | RSC ADVANCES
 |
| 出版日期 | 2016 |
| 卷号 | 6期号:25页码:21048-21055 |
| 关键词 | SILICON-CARBIDE FIBER HIGH-TENSILE STRENGTH PRECERAMIC POLYMER PYROLYSIS |
| ISSN号 | 2046-2069 |
| 通讯作者 | Zhang, WG (reprint author), Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China. |
| 英文摘要 | Competition between two different polymerization pathways to polymethylsilanes (PMS) and polycarbosilanes (PCS) was studied. This occurs in a Wurtz reduction-coupling reaction system during dechlorination of several dichloromethylsilanes via sodium in toluene. These two reactions do not carry on pari-passu, i.e., PMS is exclusively formed. However, PCS can be formed dominantly when some zirconocenes are introduced. This competition was introduced as a result of a tautomeric transformation from methylsilylene (MeRSi:) into 1-silene (CH2=SiRH). These are formed simultaneously as two intermediates but are influenced by the substitution of methyl, ethyl, phenyl or vinyl groups on silicon in the dichloromethylsilanes. Polymerization of methylsilylenes into PMS can be inhibited by deactivation of the sodium surface via chemical adsorption of zirconocene dichloride. Hence, the catalytic insertion polymerization of 1-silene intermediates into PCS occurs at the active sites of zirconocenes-this leads to the formation of PCS conversion ratios of 82% to 93% from dichloromethylsilanes with methyl, ethyl and phenyl as substituents. However, catalytic polymerization does not happen from dichloromethylvinylsilane. The mechanisms of insertion polymerization as well as the thermal dynamic barrier from polymethylvinylsilane (PMVS) to polyvinylcarbosilane (PVCS) are discussed in detail. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Chemistry, Multidisciplinary ; Chemistry |
| 类目[WOS] | Chemistry, Multidisciplinary |
| 研究领域[WOS] | Chemistry |
| 关键词[WOS] | SILICON-CARBIDE FIBER ; HIGH-TENSILE STRENGTH ; PRECERAMIC POLYMER ; PYROLYSIS |
| 收录类别 | SCI |
| 原文出处 | ROYAL SOC CHEMISTRY |
| 语种 | 英语 |
| WOS记录号 | WOS:000371019000073 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/20710]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 作者单位 | 1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tian, Yuelong,Zhang, Weigang,Ge, Min,et al. Polymerization of methylsilylenes into polymethylsilanes or polycarbosilanes after dechlorination of dichloromethylsilanes?[J]. RSC ADVANCES,2016,6(25):21048-21055. |
| APA | Tian, Yuelong,Zhang, Weigang,Ge, Min,Yu, Shouquan,Lv, Xiaoxu,&Zhang, Tingting.(2016).Polymerization of methylsilylenes into polymethylsilanes or polycarbosilanes after dechlorination of dichloromethylsilanes?.RSC ADVANCES,6(25),21048-21055. |
| MLA | Tian, Yuelong,et al."Polymerization of methylsilylenes into polymethylsilanes or polycarbosilanes after dechlorination of dichloromethylsilanes?".RSC ADVANCES 6.25(2016):21048-21055. |
入库方式： OAI收割
来源：过程工程研究所
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