24小时热门版块排行榜    

查看: 751  |  回复: 13
当前主题已经存档。

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

» 本主题相关商家推荐: (我也要在这里推广)

已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

shinyman

金虫 (正式写手)


小木虫(金币+0.5):给个红包,谢谢回帖交流
15%的样子,这是我做过一个用CPDB为链转移剂通过核磁得来的,其它情况不是很了解
2楼2009-10-10 16:06:32
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

zhangfangzhi

木虫 (职业作家)

谢谢
核磁是一种方法,可以证明链末端带硫代羰基,可以计算出末端不带硫代羰基的死聚合物链有多少。
3楼2009-10-10 16:31:35
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

zhangfangzhi

木虫 (职业作家)

用RAFT合成嵌段共聚物A-B。先聚合A,后加B的话,会有不少A和B各自的均聚物了?
用RAFT合成嵌段共聚物,产物岂不很不纯?
4楼2009-10-10 16:34:34
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

feizd

木虫 (正式写手)


小木虫(金币+0.5):给个红包,谢谢回帖交流
非常感兴趣!请问该文献出自何处?谢谢!
5楼2009-10-10 18:56:29
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

zfyanghust

银虫 (小有名气)


小木虫(金币+0.5):给个红包,谢谢回帖交流
是不是引发剂的量/(引发剂+链转移剂的量)
6楼2009-10-10 20:12:08
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

zhangfangzhi

木虫 (职业作家)

引用回帖:
Originally posted by feizd at 2009-10-10 18:56:
非常感兴趣!请问该文献出自何处?谢谢!

5楼的朋友
您是想要上图所在的文献?
7楼2009-10-11 08:54:01
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

zhangfangzhi

木虫 (职业作家)

引用回帖:
Originally posted by zfyanghust at 2009-10-10 20:12:
是不是引发剂的量/(引发剂+链转移剂的量)

6楼的朋友
您所说的 引发剂的量/(引发剂+链转移剂的量)
可有实例?
谢谢
8楼2009-10-11 08:55:39
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

zhangfangzhi

木虫 (职业作家)

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
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

zhangfangzhi

木虫 (职业作家)

引用回帖:
Originally posted by zfyanghust at 2009-10-10 20:12:
是不是引发剂的量/(引发剂+链转移剂的量)

您是正确的
谢谢
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.
10楼2009-10-11 14:50:45
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 zhangfangzhi 的主题更新
普通表情 高级回复 (可上传附件)
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[考研] 289求调剂 +15 硕星赴 2026-03-23 15/750 2026-03-26 02:16 by BruceLiu320
[考研] 335分 | 材料与化工专硕 | GPA 4.07 | 有科研经历 +6 cccchenso 2026-03-23 6/300 2026-03-25 22:25 by 544594351
[考研] 机械学硕总分317求调剂!!!! +4 Acaciad 2026-03-25 4/200 2026-03-25 19:59 by hanserlol
[考研] 材料与化工304求B区调剂 +3 邱gl 2026-03-25 3/150 2026-03-25 19:03 by Ainin_
[考研] 材料277求调剂 +4 min3 2026-03-24 4/200 2026-03-25 15:29 by fch1983
[考研] 289求调剂 +9 怀瑾握瑜l 2026-03-20 9/450 2026-03-25 11:02 by userper
[考研] 材料专硕找调剂 +5 哈哈哈吼吼吼哈 2026-03-23 5/250 2026-03-24 19:07 by 了了了了。。
[考研] 一志愿211 初试270分 求调剂 +5 谷雨上岸 2026-03-23 6/300 2026-03-24 16:32 by laoshidan
[材料工程] 一志愿C9材料与化工专业总分300求调剂 +4 曼111 2026-03-24 5/250 2026-03-24 15:44 by 星空星月
[考研] 【双一流院校新能源、环境材料,材料加工与模拟招收大量调剂】 +4 Higraduate 2026-03-22 7/350 2026-03-24 11:23 by 种大树
[考研] 一志愿吉大化学322求调剂 +4 17501029541 2026-03-23 6/300 2026-03-24 10:21 by 戴围脖的小蚊子
[考研] 284求调剂 +3 yanzhixue111 2026-03-23 6/300 2026-03-23 22:58 by pswait
[考研] 327求调剂 +5 prayer13 2026-03-23 5/250 2026-03-23 22:11 by 星空星月
[考研] 298求调剂 +8 上岸6666@ 2026-03-20 8/400 2026-03-23 11:02 by laoshidan
[考研] 求调剂一志愿海大,0703化学学硕304分,有大创项目,四级已过 +6 幸运哩哩 2026-03-22 10/500 2026-03-22 20:10 by edmund7
[考研] 303求调剂 +5 安忆灵 2026-03-22 6/300 2026-03-22 12:46 by 素颜倾城1988
[考研] 材料与化工(0856)304求B区调剂 +3 邱gl 2026-03-20 7/350 2026-03-21 19:05 by 15709483992
[考研] 0703化学调剂 +4 妮妮ninicgb 2026-03-21 4/200 2026-03-21 18:39 by 学员8dgXkO
[考研] 336求调剂 +5 rmc8866 2026-03-21 5/250 2026-03-21 17:24 by 学员8dgXkO
[考研] 295复试调剂 +8 简木ChuFront 2026-03-19 8/400 2026-03-20 20:44 by zhukairuo
信息提示
请填处理意见