w********h 发帖数: 12367 | 1 我的低分子量的PBD(Mw=2K)GPC结果显示含有少量高分子量的东西(分子量大约60K),
如何除去?我只要一点点纯的2K(大约0.5g)就可以了.过柱子这种方法就算了,我
等不及,最好是什么不同溶剂分几次的方法。什么溶剂比较好呢?toluene+环己烷? |
t***m 发帖数: 114 | 2 制备型 GPC
你这个应该很好分
【在 w********h 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 我的低分子量的PBD(Mw=2K)GPC结果显示含有少量高分子量的东西(分子量大约60K), : 如何除去?我只要一点点纯的2K(大约0.5g)就可以了.过柱子这种方法就算了,我 : 等不及,最好是什么不同溶剂分几次的方法。什么溶剂比较好呢?toluene+环己烷?
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w********h 发帖数: 12367 | 3 英雄所见略同。
正在准备去做。
但是得注射多少次才能得到我的0.5g的东西呢?
,
【在 t***m 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 制备型 GPC : 你这个应该很好分
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y****u 发帖数: 50 | 4 what is this GPC?
and GPC always uses columns, right?
,
【在 t***m 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 制备型 GPC : 你这个应该很好分
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y****u 发帖数: 50 | 5 If I were you, I would rather do the synthesis again :)
living anioic polymn of PBD should be easy...even though I have no experience.
【在 w********h 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 我的低分子量的PBD(Mw=2K)GPC结果显示含有少量高分子量的东西(分子量大约60K), : 如何除去?我只要一点点纯的2K(大约0.5g)就可以了.过柱子这种方法就算了,我 : 等不及,最好是什么不同溶剂分几次的方法。什么溶剂比较好呢?toluene+环己烷?
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w********h 发帖数: 12367 | 6 sorry..I didn't do synthesis...
I just purchase or ask other people to prepare the samples.
experience.
,
【在 y****u 的大作中提到】![](/moin_static193/solenoid/img/up.png) : If I were you, I would rather do the synthesis again :) : living anioic polymn of PBD should be easy...even though I have no experience.
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y****u 发帖数: 50 | 7 then ask Quirk to do it again
he won't fail you :P
我的低分子量的PBD(Mw=2K)GPC结果显示含有少量高分子量的东西(分子量大约60K)
?
【在 w********h 的大作中提到】![](/moin_static193/solenoid/img/up.png) : sorry..I didn't do synthesis... : I just purchase or ask other people to prepare the samples. : : experience. : ,
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w********h 发帖数: 12367 | 8 hoho...I in deed have three smaples from his kind help.
others are from Goodyear company...
those samples are really monodisperse and pure..
only one old sample is not so pure,
just because it is old.
now I am trying this method:
put the polymer in toluene at a concentration of 1%,
then drop ethanol slowly without any stir,
let it stay for one night,
tomorrow I just transfer the upper part of the solution to another beaker,
drop ethanol slowly again.....
evaporate at last.
it should get rid of t
【在 y****u 的大作中提到】![](/moin_static193/solenoid/img/up.png) : then ask Quirk to do it again : he won't fail you :P : : 我的低分子量的PBD(Mw=2K)GPC结果显示含有少量高分子量的东西(分子量大约60K) : ?
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t***m 发帖数: 114 | 9 嘿嘿,看你们的volume load 是多少喽
我们实验室的一次就可以搞定 0.1~0.2g
你的那个溶液方法做得如何了
【在 w********h 的大作中提到】![](/moin_static193/solenoid/img/up.png) : hoho...I in deed have three smaples from his kind help. : others are from Goodyear company... : those samples are really monodisperse and pure.. : only one old sample is not so pure, : just because it is old. : now I am trying this method: : put the polymer in toluene at a concentration of 1%, : then drop ethanol slowly without any stir, : let it stay for one night, : tomorrow I just transfer the upper part of the solution to another beaker,
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