24小时热门版块排行榜    

北京石油化工学院2026年研究生招生接收调剂公告
查看: 521  |  回复: 4
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

优花

金虫 (正式写手)

[交流] 【求助】 做聚合的朋友帮我看看

做过聚合的朋友帮我看下下面这段有关聚合的过程,我有几个问题想请教:
A typical polymerization was carried out according to the following
procedure. Succinic acid (44.9 g, 0.38 mol) and isosorbide (63.4 g,
0.43 mol) were weighed into a 250 mL round-bottom glass flange
reactor. The reactor was fitted with a Vigreux column and a Dean-
Stark-type condenser
to collect the condensation product. During the
first part of the synthesis, the setup was continuously flushed with inert
gas to limit oxidation and facilitate transport of water vapor. While
being stirred, the mixture was heated to 180 °C using a heating mantle.
Titanium(IV) n-butoxide (0.02 mol % relative to succinic acid),
dissolved in toluene, was added to the melt. Subsequently, the reaction
temperature was increased stepwise to maintain distillation of the
formed water. The maximum reaction temperature was 250 °C. After
4 h, vacuum processing was started at 230-250 °C, with typical
pressures ranging from 1 to 5 mba
r. Vacuum was applied for 4 h, after
which the polymer was discharged from the reactor and left to cool
and solidify.

其中的“Vigreux column  和a Dean-Stark-type condenser”中文是什么意思,因为我想搭装置,要准备这些东西;
另外还想问,他反应完要抽真空,我看真空度要达到1-5mbar,这应该要用油泵抽的吧,可是这反应体系中会有水和一些小分子量的聚合物,抽到油泵中会损害油泵,这中间需要加一些什么东西来过滤或者冷凝呢,请高手们指教

[ Last edited by wizardfox on 2008-9-10 at 15:09 ]
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

chensthjkl

铁虫 (著名写手)

everythingispossible
3楼2008-09-10 12:16:10
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
查看全部 5 个回答

chensthjkl

铁虫 (著名写手)

★ ★ ★ ★ ★
优花(金币+5,VIP+0):十分感谢
Vigreux column就是带刺的分馏柱,a Dean-Stark-type condenser就是分水器。抽真空可用液氮冷凝低沸点化合物。
everythingispossible
2楼2008-09-10 12:14:53
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

yuyang031985

金虫 (正式写手)

我用过水冷凝的方法试过,根本看不到冷凝的东西,可能是量太少的原因。反正水和小分子量的聚合物少,抽进去也无所谓了。
说说你不开心的事让我们开心一下哈!
4楼2008-09-13 17:05:51
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

polywind

木虫 (正式写手)

铁杆木虫

用带泠凝系统的旋转蒸发器可以,以酒精为冷凝液,可达-20度。
朝闻道,夕死可矣
5楼2008-09-13 20:56:05
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
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] 085600 286分 材料求调剂 +8 麻辣鱿鱼 2026-03-27 9/450 2026-03-29 15:36 by Serene1974
[考研] 299求调剂 +9 15188958825 2026-03-25 9/450 2026-03-29 14:16 by wxiongid
[基金申请] 面上5B能上会吗? +3 redcom 2026-03-29 3/150 2026-03-29 12:03 by god_tian
[考研] 0856材料化工调剂 总分330 +14 zhubinhao 2026-03-27 14/700 2026-03-29 10:01 by Sjndkwm
[考研] 调剂求院校招收 +6 鹤鲸鸽 2026-03-28 6/300 2026-03-29 08:15 by fmesaito
[考研] 311求调剂 +9 lin0039 2026-03-26 9/450 2026-03-28 13:05 by 唐沐儿
[考研] 265求调剂11408 +3 刘小鹿lu 2026-03-27 3/150 2026-03-27 20:53 by nihaoar
[考研] 305求调剂 +5 哇卢卡库 2026-03-26 5/250 2026-03-27 14:01 by laoshidan
[考研] 考研调剂 +9 小蜡新笔 2026-03-26 9/450 2026-03-27 11:10 by 不吃魚的貓
[考研] 一志愿陕师大生物学071000,298分,求调剂 +5 SYA! 2026-03-23 5/250 2026-03-27 09:29 by 不吃魚的貓
[考研] 317求调剂 +7 蛋黄咸肉粽 2026-03-26 7/350 2026-03-27 02:29 by fmesaito
[考研] 081200-11408-276学硕求调剂 +3 崔wj 2026-03-26 3/150 2026-03-26 19:57 by nihaoar
[考研] 085601求调剂总分293英一数二 +4 钢铁大炮 2026-03-24 4/200 2026-03-26 16:28 by dick_runner
[考研] 081700 调剂 267分 +11 迷人的哈哈 2026-03-23 11/550 2026-03-26 15:41 by zzll406
[考研] 化学调剂一志愿上海交通大学336分-本科上海211 +4 小鱼爱有机 2026-03-25 4/200 2026-03-26 10:19 by aa331100
[考研] B区考研调剂 +4 yqdszhdap- 2026-03-22 5/250 2026-03-25 08:51 by baoball
[考研] 调剂 +4 13853210211 2026-03-24 4/200 2026-03-24 19:44 by ms629
[考研] 一志愿南航材料专317分求调剂 +5 炸呀炸呀炸薯条 2026-03-23 5/250 2026-03-24 16:52 by 星空星月
[考研] 材料/农业专业,07/08开头均可,过线就行 +3 呵唔哦豁 2026-03-23 4/200 2026-03-23 22:30 by 汪!?!
[考研] 269求调剂 +4 我想读研11 2026-03-23 4/200 2026-03-23 21:25 by pswait
信息提示
请填处理意见