Exceptionally high molecular weight linear polyethylene by using N,N,N '-Co catalysts appended with a N '-2,6-bis{di(4-fluorophenyl)methyl}-4-nitrophenyl group
文献类型：期刊论文
| 作者 | Zhang, Randi; Ma, Yanping; Han, Mingyang; Solan, Gregory A.; Pi, Yaqing; Sun, Yang; Sun, Wen-Hua |
| 刊名 | APPLIED ORGANOMETALLIC CHEMISTRY
 |
| 出版日期 | 2019-08-05 |
| ISSN号 | 0268-2605 |
| DOI | 10.1002/aoc.5157 |
| 英文摘要 | The bis(arylimino)pyridines, 2-[CMeN{2,6-{(4-FC6H4)(2)CH}(2)-4-NO2}]-6-(CMeNAr)C5H3N (Ar = 2,6-Me2C6H3 L1, 2,6-Et2C6H3 L2, 2,6-i-Pr2C6H3 L3, 2,4,6-Me3C6H2 L4, 2,6-Et-2-4-MeC6H2 L5), each containing one N '-2,6-bis{di(4-fluorophenyl)methyl}-4-nitrophenyl group, have been synthesized by two successive condensation reactions from 2,6-diacetylpyridine. Their subsequent treatment with anhydrous cobalt (II) chloride gave the corresponding N,N,N '-CoCl2 chelates, Co1 - Co5, in excellent yield. All five complexes have been characterized by H-1/F-19 NMR and IR spectroscopy as well as by elemental analysis. In addition, the molecular structures of Co1 and Co3 have been determined and help to emphasize the differences in steric properties imposed by the inequivalent N-aryl groups; distorted square pyramidal geometries are adopted by each complex. Upon activation with either methylaluminoxane (MAO) or modified methylaluminoxane (MMAO), precatalyts Co1 - Co5 collectively exhibited very high activities for ethylene polymerization with 2,6-dimethyl-substituted Co1 the most active (up to 1.1 x 10(7) g (PE) mol(-1) (Co) h(-1)); the MAO systems were generally more productive. Linear polyethylenes of exceptionally high molecular weight (M-w up to 1.3 x 10(6) g mol(-1)) were obtained in all cases with the range in dispersities exhibited using MAO as co-catalyst noticeably narrower than with MMAO [M-w/M-n: 3.55-4.77 (Co1 - Co5/MAO) vs. 2.85-12.85 (Co1 - Co5/MMAO)]. Significantly, the molecular weights of the polymers generated using this class of cobalt catalyst are higher than any literature values reported to date using related N,N,N-bis (arylimino)pyridine-cobalt catalysts. |
| 语种 | 英语 |
| WOS记录号 | WOS:000480121200001 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/82680]  |
| 专题 | 中国科学院化学研究所 |
| 作者单位 | Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Randi,Ma, Yanping,Han, Mingyang,et al. Exceptionally high molecular weight linear polyethylene by using N,N,N '-Co catalysts appended with a N '-2,6-bis{di(4-fluorophenyl)methyl}-4-nitrophenyl group[J]. APPLIED ORGANOMETALLIC CHEMISTRY,2019. |
| APA | Zhang, Randi.,Ma, Yanping.,Han, Mingyang.,Solan, Gregory A..,Pi, Yaqing.,...&Sun, Wen-Hua.(2019).Exceptionally high molecular weight linear polyethylene by using N,N,N '-Co catalysts appended with a N '-2,6-bis{di(4-fluorophenyl)methyl}-4-nitrophenyl group.APPLIED ORGANOMETALLIC CHEMISTRY. |
| MLA | Zhang, Randi,et al."Exceptionally high molecular weight linear polyethylene by using N,N,N '-Co catalysts appended with a N '-2,6-bis{di(4-fluorophenyl)methyl}-4-nitrophenyl group".APPLIED ORGANOMETALLIC CHEMISTRY (2019). |
入库方式： OAI收割
来源：化学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。