| 查看: 934 | 回复: 13 | |||
| 当前主题已经存档。 | |||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | |||
zhangfangzhi木虫 (职业作家)
|
[交流]
【讨论】RAFT 末端不带硫代羰基的死聚合物链有多少
|
||
|
RAFT后，末端不带硫代羰基的死聚合物链有多少，占总分子链多大比例？ Ezio Rizzardo说， A key feature of RAFT polymerization is that the thiocarbonylthio groups are retained in the polymeric product. [ Last edited by zhangfangzhi on 2009-10-10 at 16:44 ] |
回复此楼» 猜你喜欢
建议基金发布提前给出明确的时间点
已经有10人回复
-
科研孤儿太难了
已经有17人回复
-
今日不放榜？网传国自然预计 8 月 27 日可查结果
已经有19人回复
-
看来今天不会放榜了？
已经有11人回复
-
时间戳又变了
已经有19人回复
-
filecode，4个jtjc了
已经有14人回复
-
让我中一个面上吧！
已经有13人回复
-
人气不行了
已经有7人回复
-
感觉是下周放榜了
已经有12人回复
-
我面上完蛋了
已经有8人回复
» 本主题相关商家推荐: (我也要在这里推广)
zhangfangzhi
木虫 (职业作家)
- 应助: 6 (幼儿园)
- 金币: 3792.7
- 散金: 340
- 红花: 22
- 帖子: 3235
- 在线: 3123.6小时
- 虫号: 405380
- 注册: 2007-06-17
- 性别: GG
- 专业: 应用高分子化学与物理
|
In the absence of chain transfer (to solvent, initiator, or monomer), the total number of chains formed will be equal to (or less than) the moles of dithio compound employed plus the moles of initiator-derived radicals generated during the course of the polymerization. In block synthesis, these additional initiator-derived chains are a source of homopolymer impurity. The level of impurities can be controlled by appropriate selection of the reaction conditions.14 For maximum purity, it is desirable to use as low a concentration of initiator as practicable and to choose solvents and initiators which give minimal chain transfer. As with conventional radical polymerization, the rate of RAFT polymerization is determined by the initiator concentration. In practice, it is usually not difficult to achieve block copolymers with no detectable homopolymer impurity (<5%) while still achieving an acceptable rate of polymerization. |
9楼2009-10-11 13:46:23
shinyman
金虫 (正式写手)
- 应助: 0 (幼儿园)
- 金币: 1220.9
- 散金: 39
- 帖子: 354
- 在线: 225.2小时
- 虫号: 446651
- 注册: 2007-10-29
- 性别: GG
- 专业: 高分子合成化学
2楼2009-10-10 16:06:32
zhangfangzhi
木虫 (职业作家)
- 应助: 6 (幼儿园)
- 金币: 3792.7
- 散金: 340
- 红花: 22
- 帖子: 3235
- 在线: 3123.6小时
- 虫号: 405380
- 注册: 2007-06-17
- 性别: GG
- 专业: 应用高分子化学与物理
3楼2009-10-10 16:31:35
zhangfangzhi
木虫 (职业作家)
- 应助: 6 (幼儿园)
- 金币: 3792.7
- 散金: 340
- 红花: 22
- 帖子: 3235
- 在线: 3123.6小时
- 虫号: 405380
- 注册: 2007-06-17
- 性别: GG
- 专业: 应用高分子化学与物理
4楼2009-10-10 16:34:34
40