| 查看: 726 | 回复: 3 | |||
| 本帖产生 1 个 翻译EPI ，点击这里进行查看 | |||
[交流]
翻译
|
|||
|
Living polymerization techniques1 allow the synthesis of polymers with predictable molecular weights and narrowmolecular weight distributions, end-functionalized polymers andwell-defined block copolymers. While intense efforts haverecently focused on development of homogeneous single-site,early metal d0 and d0fn catalysts for polymerization of ethyleneand R-olefins (particularly propylene),2 rapid chain transferprocesses in these systems have limited their use as iving polymerization catalysts. The living polymerization of R-olefins has been achieved only in rare instances and at very low temperatures.3,4 We describe here the development of a procedurefor living polymerization of R-olefins based on recently reported NiII-R-diimine catalysts5 and application of this procedure to the synthesis of diblock and triblock poly(R-olefins). Access to well-defined transition metal olefin polymerizationcatalysts has allowed detailed mechanistic studies of this importantclass of catalysts. While much attention has centered on earlytransition metal d0 and lanthanide d0fn systems,1-7 we have focusedon developing single-site late metal catalysts. Our initial report8 that Ni(II) and Pd(II) aryl-substituted R-diimine complexes bearing bulky ortho substituents were capable of polymerizing ethyleneand R-olefins has stimulated extensive experimental9-20 andtheoretical21-27 work on these catalysts. The Pd(II) systems yield highly branched polyethylene under typical polymerization conditions,while the microstructure of polyethylene produced by theNi(II) systems is dependent on monomer concentration, reactiontemperature, and ligand structure. |
回复此楼» 猜你喜欢
论文的挂名怎么评判贡献？基金申请中，排名第一的挂名文章
已经有3人回复
-
越来越担心硕士毕业后没有竞争力了
已经有13人回复
-
申博自荐 2篇一区TOP+1篇EI+2公开发明专利 2027博士申请
已经有3人回复
-
闲聊
已经有6人回复
-
申博求助
已经有4人回复
zhangzws
金虫 (正式写手)
- 翻译EPI: 41
- 应助: 0 (幼儿园)
- 金币: 1058.5
- 散金: 15
- 帖子: 355
- 在线: 115.3小时
- 虫号: 736112
- 注册: 2009-03-31
- 性别: GG
- 专业: 能源化工
2楼2010-09-16 21:12:47
zhangzws
金虫 (正式写手)
- 翻译EPI: 41
- 应助: 0 (幼儿园)
- 金币: 1058.5
- 散金: 15
- 帖子: 355
- 在线: 115.3小时
- 虫号: 736112
- 注册: 2009-03-31
- 性别: GG
- 专业: 能源化工
3楼2010-09-16 21:38:01
zhangzws
金虫 (正式写手)
- 翻译EPI: 41
- 应助: 0 (幼儿园)
- 金币: 1058.5
- 散金: 15
- 帖子: 355
- 在线: 115.3小时
- 虫号: 736112
- 注册: 2009-03-31
- 性别: GG
- 专业: 能源化工
4楼2010-09-16 21:40:03